FOOD&CHEMISTRY

Effect of soil physical properties on nitrogen leaching during sesame (Sesamum indicum L.) cultivation under lysimeter conditions

Chan-Wook  Lee12   Jung-Hun  Ok1   Yang-Min  Kim1   Yo-Sung  Song1   Hye-Jin  Park1   Byung-Keun  Hyun1   Ye-Jin  Lee1,*   Taek-Keun  Oh2,*   

1National Institute of Agricultural Sciences, Rural Development Administration, Wanju 55365, Korea
2Departmet of Bio-Environmental Chemistry, College of Agriculture and Life Science, Chungnam National University, Daejeon 34134, Korea

Abstract

A large amount of the mineral nitrogen is necessary for crop growth. With the use of nitrogen fertilizers, agricultural yield has increased during the last few decades. However, at the same time, nitrate from the cultivated land can be a source of environmental pollution, especially in water systems. For nitrogen management, it is necessary to analyze the pattern of nitrogen movement in soil. In this study, nitrogen leaching in upland soils was evaluated using undisturbed lysimeters with different soil textures during sesame cultivation. The soil texture of the lysimeters was clay loam (Songjung series) and sandy loam (Sangju series) soils. Sesame was cultivated from May 25 to August 24 in 2020. The standard amount of NPK fertilizer (N-P2O5-K2O = 2.9-3.1-3.2 kg·10 a-1) was applied before sowing. The amount of nitrogen leaching was calculated by multiplying the nitrogen (NO3--N +NH4-N) concentration and the amount of water drained below 1.5 m soil depth. The water was drained through percolation into macropores in the clay loam lysimeter. In contrast, in the sandy loam lysimeter, water drained more slowly than in the clay loam lysimeter. There was a slight difference in the total amount of leachate during the cultivation period, but the amount of nitrogen leaching was high in sandy loam soil. During the sesame cultivation period, the amount of nitrogen leaching from clay soil was 5.64 kg·10 a-1, and 10.70 kg·10 a-1 for sandy soil. We found that there was a difference in leaching depending on the soil physical characteristics. Therefore, it is necessary to consider the characteristics of soil to evaluate the leaching of nitrogen.

Figures & Tables

Fig. 1. Average temperature and rainfall during sesame cultivation.