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Plant & Forest
- Carbon stock and analysis on factors influencing in Quercus mongolica stand at Mt. Gariwang, South Korea
- Su Ho Lee, Yeong Dae Park
- This study was carried out to assess the carbon stock and analyze influencing factors in Quercus mongolica which is one of the …
- This study was carried out to assess the carbon stock and analyze influencing factors in Quercus mongolica which is one of the dominant species on Mt. Gariwang, Gangwon-do. The study sites were established a total 24 plots with a 400 m2 sized which is divided by elevation and slope to measure aboveground biomass and soil carbon concentration to a depth of 50 cm. The tree biomass carbon stock was the highest at 222.17 tC·ha-1 on south-facing slopes above 1,000 m and the lowest at 123.11 tC·ha-1 on south-facing slopes below 1,000 m. The soil carbon stock was the highest at 89.5 tC·ha-1 on north-facing slopes below 1,000 m and the lowest at 65.4 tC·ha-1 on south-facing slopes below 1,000 m. A total carbon stock which is included tree biomass, soil carbon stocks and litter layer carbon stocks was the highest on south-facing above 1,000 m (297.135 tC·ha-1). Tree carbon stocks showed a positive correlation with altitude (r = 0.76) but a negative correlation with biodiversity (r = -0.85). Soil carbon storage was positively influenced by factors such as available phosphorus, total nitrogen, and cation exchange capacity. These results showed how environmental factors influence forest carbon storage and the importance of its management and long-term monitoring for optimal carbon management in response to climate change. In conclusion, the carbon storage in Q. mongolica at Mt. Gariwang was to be superior to our national average, and it should be importantly considered the need for conservation and sustainable management of forest carbon in this region. - COLLAPSE
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Animal
- Study on the effects of immune-modulatory substances (probiotics, microalgae, and trifoliate orange peel extract) to improve intestinal health in piglets
- Seong-Hun Shim, Min-Ji Kim, Myung-Hoo Kim, Jin-Young Jeong
- Traditionally, pig farms have frequently used antibiotics to enhance disease resistance. However, the frequent use of antibiotics has led to various issues, …
- Traditionally, pig farms have frequently used antibiotics to enhance disease resistance. However, the frequent use of antibiotics has led to various issues, including public health concerns about antibiotic-resistant bacteria, prompting stricter regulations on antibiotic use. Consequently, there is a need to develop immune-modulatory substances to replace antibiotics and enhance immunity in piglets. In this study, changes in the immune status of piglets were examined by adding immune-modulatory substances (Parachlorella spp., Lactobacillus paracasei subsp. tolerans, and trifoliate orange peel extract) to their feed. Over a period of 4 weeks, the addition of these immune-modulatory substances showed no significant effects on feed efficiency and feed intake. Furthermore, there were no significant effects on the blood metabolic parameters and blood cell counts of the piglets. all the immune-modulatory substances used in this study did not significantly affect the morphological changes in the jejunal tissue of the piglets. However, the addition of trifoliate orange peel extract to piglet feed resulted in an increase in both the inflammatory cytokine interleukin (IL)-2 and the anti-inflammatory cytokine IL-10 compared to the control group. These results suggest that the addition of trifoliate orange peel extract to piglet feed may affect the immune development of piglets. Additionally, the observed decrease in specific Prevotella and increase in Oxalobacter imply that the addition of trifoliate orange peel extract to piglet feed may help gut health in piglets. Collectively, the results of this study suggest that the addition of trifoliate orange peel extract can improve gut health in piglets and serve as a safe feed additive without adverse effects on the animals. - COLLAPSE
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Animal
- A study on the correlation between muscle-to-fat ratios in Boston butt, pork belly, and half-carcass
- Sheena Kim, Jeongin Choi, Eun Sol Kim, Gi Beom Keum, Hyunok Doo, Jinok Kwak, Sumin Ryu, Yejin Choi, Juyoun Kang, Haram Kim, Yeongjae Chae, Ahwon Sung, Yujung Lee, Dongjun Kim, Kuk-Hwan Seol, Sun Moon Kang, Yunseok Kim, Pil Nam Seong, In-Seon Bae, Soohyun Cho, Hyo Jung Kwon, Samooel Jung, Youngwon Lee, Hyeun Bum Kim
- This study aimed to compare the correlation between muscle-to-fat volume ratios in specific pork cuts (Boston butt and pork belly) and the …
- This study aimed to compare the correlation between muscle-to-fat volume ratios in specific pork cuts (Boston butt and pork belly) and the half-carcass using computed tomography (CT). CT scans of 21 crossbred gilt carcasses were performed to measure the muscle and fat volumes in the Boston butt and pork belly. The results indicated a muscle-to-fat volume ratio of 1 : 0.58 for the half-carcass, 1 : 0.37 for the Boston butt, and 1 : 0.79 for the pork belly. Pearson’s correlation coefficient served as the method to evaluate the relationship between the regions. The correlation coefficients for the half-carcass and pork cuts are -0.9608 and 0.7423, respectively, in the order of Boston butt and pork belly. The results of this study confirmed that there is a high negative correlation between the muscle-to-fat volume ratio of the carcass and the Boston butt, but additional research is needed to verify these results. - COLLAPSE
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Engineering
- Spectral analysis for Protaetia brevitarsis seulensis powder adulterated with chickpea (Cicer arietinum) and soybean (Glycine max) flour by pointed near-infrared spectroscopy
- Reza Adhitama Putra Hernanda, Juseung Kim, Juntae Kim, Mohammad Akbar Faqeerzada, Hanim Zuhrotul Amanah, Byoung-Kwan Cho, Moon Sung Kim, Hoonsoo Lee
- Increasing concern for food safety and quality leads to a growing interest in using edible insects as a new food source. Our …
- Increasing concern for food safety and quality leads to a growing interest in using edible insects as a new food source. Our research proposed using near-infrared (NIR) spectroscopy to detect chickpea and soybean flour in Protaetia brevitarsis seulensis (PBS) powder. The adulteration was made by adding the chickpea and soybean flour with 5% increments to the PBS powder and the total weight was five grams. Our proposal utilized two regression machine learning techniques: partial least squares regression (PLSR) and Gaussian process regression (GPR). We found that GPR using the original spectra was the most effective model for predicting chickpea content indicated by an R2p of 0.996, root mean squared error of prediction (RMSEP) of 0.970%, and ratio of prediction to deviation (RPD) of 15.970, while the optimum model for predicting soybean content had an R2p of 991, RMSEP of 1.435%, and RPD of 10.778. This approach showed promise for detecting plant-based adulterants in PBS powder. - COLLAPSE
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Plant & Forest
- Risk assessment and evaluation of herbicide resistance transgenic zoysiagrass (JG21): Responses to Cyprinus carpio fed on herbicide resistance transgenic zoysiagrass
- Kyunglyung Baek, Ye Jin Jang, Hyeon-Jin Sun, Hyo-Yeon Lee, Eun-Hee Song, Seong-Kon Lee, Doh-Won Yun, Jong-Chan Park, Ancheol Chang, Sung-Dug Oh
- Herbicide-resistant transgenic zoysiagrass JG21 expressing bar gene inserted in the plant genome has been generated previously through Agrobacterium tumefaciens-mediated transformation. The …
- Herbicide-resistant transgenic zoysiagrass JG21 expressing bar gene inserted in the plant genome has been generated previously through Agrobacterium tumefaciens-mediated transformation. The acute toxicity effect of herbicide-resistant transgenic zoysiagrass and non-genetically modified (GM) zoysiagrass (Zoysia japonica Steud.) on Cyprinus carpio was investigated at different concentrations (0, 1,250, 2,500, 5,000, 10,000 and 20,000 mg·L-1). It was confirmed through strip that herbicide-resistant transgenic zoysiagrass was resistant to glyphosinate herbicides by introduction of phosphinothricin acetyltransferase (PAT) gene from the Streptomyces hygroscopicus. Feeding tests were conducted with C. carpio to evaluate the environmental risk of transgenic zoysiagrass, including herbicide resistance gene. C. carpio was fed 100% ground zoysiagrass suspension, herbicide resistance zoysiagrass or non-GM counterpart zoysiagrass. The 48 h-LC50 (lethal concentration 50) values of the herbicide resistance and non-GM counterpart zoysiagrass were 10,670 mg·L-1 (95% confidence limits: 9,230 - 12,340 mg·L-1) and 11,220 mg·L-1 (95% confidence limits: 9,910 - 12,710 mg·L-1), respectively. The zoysiagrass NOEC (no observed effect concentration) value for C. carpio was suggested to be 2,500 mg·L-1. Based on these results, there was no significant difference in toxicity for non-target organisms (C. carpio) between the herbicide resistance zoysiagrass and non-GM counterparts. - COLLAPSE
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Animal
- Bacillus probiotics: A novel spraying agent to supress the noxious gas emission from the pig barn
- Shanchuan Cao, In Ho Kim
- The aim of this study was to investigate the effect of mixed microbial preparations on the production of harmful gas emissions in …
- The aim of this study was to investigate the effect of mixed microbial preparations on the production of harmful gas emissions in pig housing and slurry. The trial was conducted at fattening houses, with a total of 300 pigs. Each room has 150 pigs. Pigs were fed with basal diet for 3 weeks. To supress the noxious gas Bacillus subtilis (1.0 × 107 cfu·g-1) and Bacillus licheniformis (1.0 × 107 cfu·g-1) as spraying agent were used. The ratio of the two bacterial spraying agents was 1 : 1. Spraying at a dilution rate of 500 grams per tonne. A probiotic mixture was sprayed to the faecal slurry twice daily at 8 am and 8 pm. The air in the house and the faecal slurry were tested for on weekly basis. Our results showed that the application of mixed probiotics to the pig barn has significantly reduce acetic acid, H2S, CO2 and methyl mercaptans emission not only from the faecal slurry but also from the barn. In summary, we infer that the continuous spraying of probiotic mixtures would be more helpful to improve air quality in pig houses and also considered as novel strategy to control environmental pollution. - COLLAPSE
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Animal
- Effects of lairage stocking density and lairage time on slaughter pigs
- Se Hyun Park, Dong Cheol Song, Se Yeon Chang, Kyeong Ho Jeon, Hyuck Kim, Jin Mo Yang, Jin Ho Cho
- The aim of this study was to elucidate the impacts of lairage stocking density and lairage time on slaughter pigs. A total …
- The aim of this study was to elucidate the impacts of lairage stocking density and lairage time on slaughter pigs. A total of 607 mixed-sex crossbred fattening pigs (Duroc × [Yorkshire × Landrace], LYD) weighing between 115 and 120 kg at live weight were used. Lairage stocking density treatments were as follows: HD, high stocking density (lower than 0.5 m2 / 100 kg pigs); ND, normal stocking density (0.5 m2 / 100 kg pigs to 0.83 m2 / 100 kg pigs); LD, low stocking density (higher than 0.83 m2 / 100 kg pigs). Lairage time treatment was as follows: ST, short time (0 to 4 h); LT, long time (4 to 8 h). Backfat thickness was significantly increased (p < 0.05) in HD compared with LD. Water holding capacity was significantly higher (p < 0.05) in LD compared with HD. Cooking loss was significantly lower (p < 0.05) in LD compared with HD. Also, LD showed significantly (p < 0.05) lowest sitting behavior compared with ND and HD. Also, HD showed significantly (p < 0.05) highest sitting behavior compared with ND and LD. Moreover, LD showed significantly (p < 0.05) decreased cortisol concentration compared with HD. Therefore, LD could be ideal condition for improve pork quality and animal welfare. - COLLAPSE
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Engineering
- Theoretical kinematic analysis of a sliding-type picking mechanism for automatic pepper seedling transplanters
- Im-Joung Choi, Eliezel Habineza, Md Nasim Reza, Seok-Ho Park, Deok-Hyung Lee, Dae-Hyun Lee, Sun-Ok Chung
- Appropriate pepper seedling picking mechanism significantly impacts the overall transplanting efficiency and mechanization rate. Theoretical analysis of the picking device helps to …
- Appropriate pepper seedling picking mechanism significantly impacts the overall transplanting efficiency and mechanization rate. Theoretical analysis of the picking device helps to generate the necessary kinematic data for predicting the seedling transplanting performance in the actual field. This study aimed at determining feasible link bar combination, velocity, and acceleration, as well as the input driving torque required to convey and release the pepper seedlings smoothly. 3D model assembly of the five-bar sliding-type picking mechanism was theoretically modelled, and the motion was simulated using a commercial software. The model of the sliding pin and bar mechanism consisted of a driving link, a driven link, a connecting link, a slider, a fixed slot, and an end-effector. For the kinematic simulation, the dimensions of the driving link, driven link, connecting link, and end-effector were variable, while the dimensions of the fixed slot and slider remained constant. To select the proper link bar combination with the corresponding peak velocity and acceleration that maintains an appropriate picking trajectory, ten simulation trials of different link bar lengths were conducted. To calculate the driving torque needed to transplant one pepper seedling, six driving-link speed trials were considered. The best link bar combination found was 54 mm, 106 mm, 116 mm, 114 mm, and 140 mm for the driving link, connecting link, driven link, end-effector, and fixed link, respectively. At a 30 rpm of driving link speed, the end-effector exhibited optimal velocities of 0.274 m·s-1 and 0.199 m·s-1, and accelerations of 2.94 m·s-2 and 8.249 m·s-2 along the x- and y-axes, respectively. The driving torque required to complete one revolution cycle of pepper seedling picking was 2,700 Nm at a rate of 30 seedlings per minute. The results of this study would offer theoretical support for enhancing the design of the sliding pin and bar mechanism used pepper seedling transplanters. - COLLAPSE
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Plant & Forest
- The effect of nitrogen and phosphorus fertilization on growth, photosynthesis and leaf nutrient of seedlings of warm temperate species (Chamaecyparis obtusa, Machilus thunbergii, Quercus salicina)
- Hyung Won Kim, Min Seon Jo, Woo Bin Youn, Hyun Ju Lee, Ye Jin Kong, Jong Chan Yeo, Sang Hyun Park, Byung Bae Park
- The demand for seedlings of warm temperate tree species is increasing because of warming by climate change in Korea Peninsula. In order …
- The demand for seedlings of warm temperate tree species is increasing because of warming by climate change in Korea Peninsula. In order to produce healthy seedlings, appropriate fertilization methods must be established for each species. In this study, we investigated the effects of nitrogen and phosphorus fertilization on the growth, photosynthesis, specific leaf area (SLA), and leaf nutrient content of one-year-old seedlings of Chamaecyparis obtusa, Machilus thunbergii, and Quercus salicina. A total of 16 fertilization treatments, combining four levels of N (0, 1, 2, 3) and P (0, 1, 2, 3), were applied. For instance, a treatment with zero nitrogen and double phosphorus was expressed as N0P2. The results revealed that nitrogen fertilization significantly enhanced root collar diameter, height, and photosynthesis across all three species, while phosphorus fertilization alone showed no significant effects on growth. Optimal photosynthesis was observed under N2P0 for C. obtusa, N2P3 for M. thunbergii, and N3P0 for Q. salicina. These findings suggest that nitrogen fertilization is critical for promoting seedling growth and physiological performance, but over-fertilization may result in growth inhibition or imbalances in nutrient uptake. This study provides valuable insights into N and P fertilization strategies and highlights the importance of optimizing nitrogen and phosphorus inputs for healthy seedling production. The results will contribute to improving the adaptability and productivity of warm temperate tree species, supporting their effective use in reforestation and afforestation under changing climate conditions. - COLLAPSE
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Plant & Forest
- Soil brought and subsoil inversion effects on Pinus densiflora, Pinus koraiensis and Prunus sargentii seedlings at the nursery production system
- Sang Hyun Park, Ye Jin Kong, Woo Bin Youn, Jong Chan Yeo, Hyung Won Kim, Hyun Ju Lee, Byung Bae Park
- Healthy seedling production is one of the essential processes for a sustainable afforestation system. In Korea, despite technological advancements, more than 60% …
- Healthy seedling production is one of the essential processes for a sustainable afforestation system. In Korea, despite technological advancements, more than 60% of seedling production continues to rely on traditional open-field seedlings. This is primarily due to the limited adoption of systematic container seedling production and advanced management technology. Growing seedlings in fixed plots over long periods often leads to issues such as soil degradation and nutrient depletion, which hinder the production of healthy seedlings. This study investigated the impact of three soil improvement treatments on the growth characteristics of major economic tree species in Korea, specifically Pinus densiflora Siebold & Zucc., Pinus koraiensis Siebold & Zucc., and Prunus sargentii Rehder. The soil treatments examined include: (1) “soil brought” addition, where new soil is layered on top of existing soil, (2) “subsoil inversion”, a method that enhances soil quality by mixing surface soil with subsoil, and (3) “mixed treatment”, a 1 : 1 blend of existing soil and new soil. The results indicated that the subsoil inversion treatment improved soil mass and clay ratio, alleviated the physicochemical properties of the soil, and positively influenced the early growth of seedlings. The soil brought treatment showed an increase in the sand ratio and yielded the lowest growth performance for seedlings, contrary to previous studies. These findings can be attributed to the fact that the soil used in “soil brought” was similar to conventional soils commonly used in seedling production. The mixed treatment showed a positive effect after the subsoil inversion, suggesting that it holds potential as an alternative method for soil improvement. While the soil improvement methods discussed in this study are well-known, further research is necessary due to the varying results that emerge depending on the species and environmental conditions. Thus, the findings emphasize the need for species-specific and site-specific soil improvement strategies to enhance the success of afforestation efforts. - COLLAPSE
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Plant & Forest
- The effects of N and P fertilizer application on the growth and nutrient concentrations of Chamaecyparis obtusa, Machilus thunbergii, Quercus salicina seedlings in Jeju Island, Korea
- Hyun Ju Lee, Jong Chan Yeo, Woo Bin Youn, Hyung Won Kim, Sang Hyun Park, Ye Jin Kong, Byung Bae Park
- This study aimed to determine optimal nitrogen (N) and phosphorus (P) fertilization levels for seedling production of Chamaecyparis obtusa, Machilus thunbergii …
- This study aimed to determine optimal nitrogen (N) and phosphorus (P) fertilization levels for seedling production of Chamaecyparis obtusa, Machilus thunbergii, and Quercus salicina in Jeju Island, Korea. Sixteen fertilization treatments combining four levels each of N (0, 30, 60, 90 g·m-2) and P (0, 70, 140, 210 g·m-2) were applied to one-year-old seedlings. After 4 months, growth parameters, photosynthetic characteristics, soil and foliar nutrient concentrations were measured. Results showed that excessive combined N and P fertilization negatively impacted seedling growth and photosynthesis across all species. For C. obtusa and M. thunbergii, treatments N1P3 (N 30 g·m-2, P 210 g·m-2) or N3P0 (N 90 g·m-2, P 0 g·m-2) produced optimal results, while N3P2 (N 90 g·m-2, P 140 g·m-2) was most suitable for Q. salicina. Nitrogen fertilization significantly decreased foliar P, K, and Mg concentrations in C. obtusa and M. thunbergii. Phosphorus fertilization increased foliar P in Q. salicina, though not significantly. Soil pH and exchangeable K decreased with increasing fertilization rates, while electrical conductivity increased with P application. This study provides insights into species-specific fertilization strategies for seedling production in Jeju Island. These findings can contribute to more economical and environmentally efficient seedling production practices for these species in Jeju Island. - COLLAPSE
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Plant & Forest
- Growth responses of Pinus densiflora and Betula platyphylla seedlings by soil improvement treatment in a nursery
- Ye Jin Kong, Min Seon Jo, Woo Bin Youn, Sang Hyun Park, Jong Chan Yeo, Hyung Won Kim, Hyun Ju Lee, Byung Bae Park
- This study investigated the growth response of planted Pinus densiflora and Betula platyphylla seedlings to 8 soil improvement treatments: No treatment for …
- This study investigated the growth response of planted Pinus densiflora and Betula platyphylla seedlings to 8 soil improvement treatments: No treatment for control, two organic composts (Comp_B and Comp_Y), and 5 inorganic amendments (vermiculite, perlite, two level of zeolites, and PVZ (perlite + vermiculite + zeolite) at the Yongmoon Nursery. No significant effects on growth were observed in P. densiflora with soil amendment treatments, whereas there were significant growth changes in B. platyphylla (p < 0.05). The height of B. platyphylla in the Zeo_5 (zeolite 5 kg) treatment was significantly greater than in the control, and the dry weight in the Verm (vermiculite) treatment increased compared to the control. Additionally, the H/D ratio of both P. densiflora and B. platyphylla in the PVZ treatment fell within the standard seedling range, while only the T/R ratio of B. platyphylla in the PVZ treatment was within the appropriate T/R ratio. The results indicate that birch is more responsive to soil amendment treatments than pine, and some soil improvements could be applied in a permanent nursery system. Because the seedlings responses to soil improvement are different by species and materials used for soil amendments, soil improvement treatment should be specific by nursery condition to be more effective for tree growth as well as for soil stabilization in open-field nurseries and production of healthy seedlings. - COLLAPSE
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Plant & Forest
- A needs analysis for a forest therapy program based on foreign resident demographics
- Young Ha Lee, Bum Jin Park
- This study was conducted as basic research to expand the mental and physical therapeutic functions of forest therapy to foreign residents, aiming …
- This study was conducted as basic research to expand the mental and physical therapeutic functions of forest therapy to foreign residents, aiming to provide data for creating culturally tailored forest therapy programs. A survey of 107 foreign residents in Daejeon, Korea, revealed that 74% were unaware of forest therapy, but 78.5% were interested in participating. The preferred group size was 6 - 10 people, with Saturdays from 9 am to 12 pm being the most popular time. Participants favored outdoor programs and were willing to pay KRW 10,000 - 20,000 for a 2-h session. Acculturation stress was generally low, but higher among Asian and African respondents compared to North Americans and Europeans. Forest therapy, known for its positive effects on various types of stress as demonstrated by previous studies, could be a valuable solution for alleviating the acculturation stress experienced by foreign residents in Korea. To design effective programs, it’s essential to consider cultural differences and increase awareness of forest therapy. Future research should explore the connection between these programs and psychological factors like depression and anxiety. The findings offer a foundation for developing supportive forest therapy initiatives for foreign residents. - COLLAPSE
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Animal
- Effect of the new attractive compositions for mass capture of the yellow-legged hornet, Vespa velutina nigrithorax (Hymenoptera: Vespidae)
- Jong-Eun Lee, Hyo-Ryeo Cho, Sang-Kyu Park, Yu-Jin Kim, So-Young Jung, Myeong-Hyeon Nam
- The yellow-legged hornet, Vespa velutina nigrithorax, has been causing very serious damage to beekeepers for the past few years, yet there …
- The yellow-legged hornet, Vespa velutina nigrithorax, has been causing very serious damage to beekeepers for the past few years, yet there is no effective control technology available. This study was carried out to improve the attraction and persistence of compositions for the capture of wasps including the yellow-legged hornet. From April 1st to November 30th 2023, experiments were conducted to capture hornets. The total number of hornets captured using two control products (Cont.-A and Cont.-B) and four compositions (P-A, P-G, T23-A, and T23-G) were as follows: Cont.-A 193, Cont.-B 223, P-A 619, T23-A 877, P-G 719, and T23-G 1,253. In particular, in the peak season (from October to November), the wasp reproduction period, the mean number of wasps captured by different treatments from October 16 to October 22 at the apiary in Nonsan including V. velutina nigritharax, V. mandarinia, and V. analis etc. were 16.1 ± 0.5 in control A and B, 45.6 ± 6.3 in P-A, 78.3 ± 8.7 in T23-A, 100.3 ± 12.5 in P-G, and 293.6 ± 7.4 in T23-G. The capture index (CI) compared to the control group (A&B) at the most number of wasps captured from October 16 to October 22 was evaluated as P-A 2.9, T23-A 4.9, P-G 6.3, and T23-G 18.4. In addition, the mean distribution rate of the captured wasps was showed as V. velutina nigrithorax 83.3%, V. crabro flavofasciata 8.7%, V. ducalis 4.0%, V. mandarinia 3.8%, and V. analis 0.2%. - COLLAPSE
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Plant & Forest
- Comparative hydrophilics metabolic profiling of drought-tolerant GM rice (Agb0103) and commercial rice (Oryza sativa L.) across regions and years using multivariate analysis
- Gyeong-Min Lee, Ye-Jin Jang, Soo-Yun Park, Eun-Ha Kim, Imran Muhammad, Kyunglyung Baek, Doh-Won Yun, Jong-Chan Park, An-Cheol Chang, Sung-Dug Oh
- The safety evaluation of genetically modified (GM) crops intended for food and feed involves a comparative analysis of their composition and phenotype …
- The safety evaluation of genetically modified (GM) crops intended for food and feed involves a comparative analysis of their composition and phenotype against established varieties. This study aimed to conduct a comparative metabolic profiling of drought-tolerant GM rice (Agb0103), its isogenic counterpart rice (Ilmi), and various commercial rice varieties utilizing multivariate analysis. The rice varieties examined included drought-tolerant GM rice (Agb0103), isogenic counterpart rice (Ilmi), and commercial varieties such as Nakdong, Dongjin, Nampyeong, Chilbo, and Unkwang, all of which belong to the japonica type. Extracted samples underwent analysis via gas chromatography–time-of-flight mass spectrometry (GC-TOF-MS), resulting in the profiling of 43 distinct hydrophilic metabolites, including organic acids, amino acids, and sugars, which were subsequently subjected to rigorous multivariate statistical analyses. Correlations across different regions, years, and varieties were assessed using principal component analysis, hierarchical clustering analysis, and partial least squares discriminant analysis. Despite variations observed among the different varieties, regions, and years, the drought-tolerant GM rice (Agb0103) exhibited a composition analogous to that of the isogenic counterpart rice (Ilmi) and commercially available varieties, revealing no statistically significant differences from the commercially available rice. - COLLAPSE
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Food & Chemistry
- Effect of liquid fraction from livestock manure on short-term cucumber (Cucumis sativus L.) cultivation
- Jong-Oui Park, Yun-Gu Kang, Deog-Bae Lee, Byeong-O Lee, Taek-Keun Oh
- Liquid fraction of livestock manure (LF) is often not preferred as a fertilizer due to its low convenience compared to inorganic fertilizer …
- Liquid fraction of livestock manure (LF) is often not preferred as a fertilizer due to its low convenience compared to inorganic fertilizer (IF). This study investigated the potential of using a liquid fraction from livestock manure as a convenient alternative to IF. The experiment evaluated the before and after effects of mixed use of IF and liquid fraction on cucumber productivity and soil chemistry. The LF used in the experiment was fermented and the suspended solids were filtered to facilitate for irrigation. The experiment was conducted in a greenhouse with treatments consisting of no treatment (Control), IF treatment, mixed use of liquid fraction of livestock manure and inorganic fertilizer (LF+IF). The results showed that the productivity of LF+IF converged at 99% compared to the IF treatment. Although the total production was the same for about 27 harvests, the yields varied through harvest season. And in soil chemistry, Organic matter, phosphorus, potassium, calcium, magnesium, and electrical conductivity (EC) were lower in the LF+IF compared to the IF treatments, with potassium, calcium, magnesium, and EC corrected to appropriate levels. Therefore, it is believed that LF can not only replace IF, but also improve the excessive accumulation of soil nutrients in the soil. - COLLAPSE
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Food & Chemistry
- Seed germination and bio-luminance inhibition assay for ecotoxicity of selenium
- Hyun-Young Kim, Young-Kyu Hong, Jin-Wook Kim, Sung-Chul Kim
- Selenium (Se) is an essential element for the growth of crops, animals, and even humans. However, little information is available on the …
- Selenium (Se) is an essential element for the growth of crops, animals, and even humans. However, little information is available on the toxic effect of Se in terms of ecological aspects. The main objective of this study was to evaluate the ecotoxicological impact of Se based on seed germination and bio-luminance inhibition assay using mono and dicotyledonous plants and bioluminescent bacteria (Vibrio fischeri). The result showed that ecotoxicity of Se was not observed for monocotyledonous while significantly low germination rate (17.8% for Chinese cabbage and 15.6% for cabbage) was monitored for the dicotyledonous at the 50 mg·L-1 of Se concentration. In addition, a low activity inhibition rate (less than 30%) was observed when the bio-luminescence test was conducted. Overall, the ecotoxicity of Se can vary depending on the test species and the ecotoxicological database is necessary for the understanding of Se toxicity in the organisms. - COLLAPSE
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Food & Chemistry
- Effect of poultry manure biochar on soil nutrition and carbon improvement in Saemangeum reclaimed soils
- Ju-Hyoung Shin, Yun-Gu Kang, Jun-Yeong Lee, Jun-Ho Kim, Taek-Keun Oh
- Low nutrient and organic matter (OM) contents in reclaimed agricultural soils can hinder crop growth, making it essential to improve the chemical …
- Low nutrient and organic matter (OM) contents in reclaimed agricultural soils can hinder crop growth, making it essential to improve the chemical characteristics of reclaimed agricultural soil to maintain crop productivity. Poultry manure (PM) can effectively supply nutrient content by its high nitrogen (N) and phosphorus (P) concentrations, while leads to environmental issues, including odor and greenhouse gas emissions, by improper pre-treatment. This study aimed to evaluate the effect of PM-based biochar containing the varying rate of rice husk on soil improvement in reclaimed agricultural land. Soil samples were collected from the Saemangeum reclaimed land, and biochars were produced using PM as the primary ingreidient, with different proportions (i.e., 0, 10, 30, 50, 70, 90, and 100%) of rice husk. All biochar samples were pyrolyzed at 350℃ for 1 h. Chemical characteristics of biochar showed that increasing the proportion of rice husk decreased the pH electrical conductivity, and nutrient (N, K2O, CaO, and MgO) contents, while carbon and OM contents increased. Regarding soil improvement, the nutrient and OM contents significantly increased when biochar was applied at a rate of 5.0 Mg·ha-1 or more. Lettuce yield increased as the biochar application rate increased and the rice husk ratio in the PM-based biochar decreased, with the highest yield (33.52 Mg·ha-1) observed in reclaimed soil treated with 10.0 Mg·ha-1 of PM-based biochar without rice husk. Therefore, to improve soil nutrient content, minimizing the rice husk proportion in the PM-based biochar was most effective, while OM improvement was enhanced with increasing rice husk ratios. - COLLAPSE
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Plant & Forest
- Analyzing changes in media coverage of forest roads from 2014 to 2023: A text mining approach
- Hyeon-Jun Jeon, Ye Jun Choe, Hyeongkeun Kwon, Yeong-In Hwang, Joon-Woo Lee
- This study examines changes in media coverage of forest roads from 2014 to 2023 using text mining techniques. As key infrastructure for …
- This study examines changes in media coverage of forest roads from 2014 to 2023 using text mining techniques. As key infrastructure for sustainable forest management, forest roads also contribute to wildfire suppression and disaster prevention. By analyzing news articles, the research identifies a shift in media focus from forest management and public access to the role of forest roads in disaster management, particularly in response to recent large-scale wildfires and climate-induced extreme weather events. Using methodologies such as term frequency-inverse document frequency (TF-IDF), N-gram, and clustering, the findings provide insights into evolving societal perceptions of forest roads, offering valuable information for future policy-making and research. - COLLAPSE
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Plant & Forest
- Comparison of forest fire damage reduction effects of forest road based on dNBR
- Yeongin Hwang, Hyeongkeun Kweon, Kyeongcheol Lee, Jung Il Seo, Seong-Min Choi, Yun-Jin Shim, Joon-Woo Lee, Jin Seong Hwang
- This study was conducted to compare the intensity of forest fire damage based on the distance from the center of forest roads …
- This study was conducted to compare the intensity of forest fire damage based on the distance from the center of forest roads in three regions where forest roads were constructed within areas affected by forest fires in 2023. The difference normalized burn ratio (dNBR) was utilized to quantify the intensity of forest fire damage. The results demonstrated that the intensity of forest fire damage increased with distance from the forest road center, yet remained significantly lower than that in the overall fire-affected region (p < 0.001). Regarding burn severity classifications, the proportions of ‘Unburned’ and ‘Low severity’ areas decreased as the distance from the forest road center increased, while the proportions of ‘Moderate high severity’ and ‘High severity’ areas increased. Overall, the intensity of forest fire damage in the periphery of forest roads was lower compared to the broader fire-affected regions, as indicated by average dNBR values and burn severity levels. However, a direct causal relationship between the presence of forest roads and the reduction in forest fire damage intensity in their periphery was not established. Further investigations, including satellite imagery analysis and on-site verification, are deemed necessary to better elucidate the distribution and intensity of forest fire damage in these areas. - COLLAPSE
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Plant & Forest
- Adolescents’ perceptions and information needs regarding agricultural biotechnology: Deriving effective information delivery strategies
- Bumkyu Lee, Sung-Dug Oh, Jong Mi Kim
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Engineering
- Analysis of reservoir flood inflow and outflow: Case study of O-eo reservoir
- Yeon-Dong Choi, Yonghyeon Lee, Hyunuk An, Heasumg Lim, Youngteck Hur
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Engineering
- Development of overtopping protection system using gabion retaining wall in deteriorated agricultural reservoir embankment
- Young Hak Lee, Ji Sang Han, Tae Min Yeom, Su Hyeon Park, Sung Won Song, Bo Ra Yun, Cheol Han Kim, Dal Won Lee
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Management & Economics
- Study for the development of policy through a survey on the current status of food industry in Chungnam area
- Sounghun Kim, Gwangsik Oh, Ga Eul Kim
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Engineering
- Water stress level classification of sweet potato using infrared thermal imaging and plant growth indicators
- Ji Won Choi, Soo Been Cho, Woon-Ha Hwang, Byoung-Kwan Cho, Dae-Bin Song, Geonwoo Kim
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Management & Economics
- Effects of exports of agricultural products on regional economy: In case of the Miryang area
- Sorim Kee, Hansung Lee
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Food & Chemistry
- Residual characteristics of picoxystrobin, flufenoxuron, and teflubenzuron in Chinese matrimony vine by heat-drying treatment
- Seo-Young Jang, Young-Shin Kim, Chi-Hwan Lim
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Engineering
- A study on cultivation models and mechanization rates for onion cultivation standardization: Focusing on the Gyeongsangnam-do
- Jae-Seo Hwang, Young-Sun Kang, Wan-Soo Kim
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Management & Economics
- Characteristics analysis of Millennials’ types classified by multivariate methods: Based on consumption values and their food purchasing behavior via online
- Uhn-Soon Gim, Hye Jung Moon, Tsolmon Byamba-Ochir
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Food & Chemistry
- Response of biochar amendment for substituting organic fertilizer ingredients in kale-grown soils
- Yun-Gu Kang, Jiwon Choi, Jun-Yeong Lee, Jun-Ho Kim, Ji-Hoon Kim, Do-Gyun Park, Taek-Keun Oh, Yeo-Uk Yun
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Food & Chemistry
- Physicochemical properties of aronia jam according to sugar substitute combinations
- Mi Hyeon Park, Ju-Sung Kim
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Management & Economics
- Analysis of consumption status for expanding consumption of elderly-friendly foods: Using a survey
- Soon Seop Hwang, Sounghun Kim
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Animal
- Taxonomic study of the plant bug species Proboscidocoris varicornis (Jakovlev, 1904) using morphological and molecular data
- Junggon Kim, Geunho Jang, Sunghoon Jung
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Animal
- Effects of supplementing palm kernel meal on growing-finishing pig’s diet: Meta-analysis
- Jae-Cheol Jang, Sang-Hyon Oh, Hong Jun Kim, Yoo Yong Kim, Hee Kyung Oh
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Animal
- Replacing high zinc oxide with natural additives (organic acid blends, essential oils, and capsicum oleoresin) reveals better growth performance in weaning pigs
- Vetriselvi Sampath, In Ho Kim
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Management & Economics
- Can agricultural production stability reduce price volatility?
- Jun Ho Seok, Dae Hee Chung, Hanpil Moon
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Plant & Forest
- Effect of preharvest spray of AVG and sprayable 1-MCP on fruit quality in GA4+7 treated ‘Wonhwang’ pears
- Sung-Joon Park, Hyeong-Seok Lee, Young-Jik Ahn, Jong-Pil Chun
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Plant & Forest
- Projected distribution of Rhododendron micranthum Turcz. in limestone areas under two climate scenarios using MaxEnt
- Jiyoung Jung, Dong-Hak Kim, Sanghyuk Lee
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Engineering
- Analysis of driving axle and PTO power transmission efficiency of an 18 kW-class single motor electric tractor
- Cheol Woo Yang, Gyeong Eui Nam, Han Yeol Yu, Jong Dae Park, Jin Woo Jeong, Seung Yun Baek, Yong Joo Kim, Nyun Ki Chung
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Plant & Forest
- Characteristics of endophytic bacteria in Cnidium officinale Makino from the Republic of Korea
- Seok Hui Lee, Jong-Beom Seo, Jun Young Park, Su Hong Jeon, Dae Sol Kim, Hyeon-Jong Kong, Hyun Jun Kim, Hui Yeong Jeong, Jun Won Kang
Journal Informaiton
Korean Journal of Agricultural Science
Korean Journal of Agricultural Science
Institute of Agricultural Science, Chungnam National University
충남대학교 농업과학연구소
99, Daehak-ro, Yuseong-gu, Daejeon 34134, Korea
Tel: +82-42-821-6709 / Fax: +82-42-821-8890 / E-mail: cnuagro@cnu.ac.kr Copyright© Institute of Agricultural Science, Chungnam National University. Powered by APUB
Tel: +82-42-821-6709 / Fax: +82-42-821-8890 / E-mail: cnuagro@cnu.ac.kr Copyright© Institute of Agricultural Science, Chungnam National University. Powered by APUB