ENGINEERING

Short-range sensing for fruit tree water stress detection and monitoring in orchards: a review

Sumaiya Islam1, Md Nasim Reza1,2, Shahriar Ahmed2, Md Shaha Nur Kabir2,3, Sun-Ok Chung1,2,*, Heetae Kim4,*

1Department of Smart Agricultural Systems, Graduate School, Chungnam National University, Daejeon 34134, Korea
2Department of Agricultural Machinery Engineering, Graduate School, Chungnam National University, Daejeon 34134, Korea
3Department of Agricultural and Industrial Engineering, Faculty of Engineering, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200, Bangladesh
4National Institute of Agricultural Sciences, Rural Development Administration, Jeonju 54875, Korea

*Corresponding authors: sochung@cnu.ac.kr, htkim1025@korea.kr

Abstract

Water is critical to the health and productivity of fruit trees. Efficient monitoring of water stress is essential for optimizing irrigation practices and ensuring sustainable fruit production. Shortrange sensing can be reliable, rapid, inexpensive, and used for applications based on welldeveloped and validated algorithms. This paper reviews the recent advancement in fruit tree water stress detection via short-range sensing, which can be used for irrigation scheduling in orchards. Thermal imagery, near-infrared, and shortwave infrared methods are widely used for crop water stress detection. This review also presents research demonstrating the efficacy of short-range sensing in detecting water stress indicators in different fruit tree species. These indicators include changes in leaf temperature, stomatal conductance, chlorophyll content, and canopy reflectance. Short-range sensing enables precision irrigation strategies by utilizing real-time data to customize water applications for individual fruit trees or specific orchard areas. This approach leads to benefits, such as water conservation, optimized resource utilization, and improved fruit quality and yield. Short-range sensing shows great promise for potentially changing water stress monitoring in fruit trees. It could become a useful tool for effective fruit tree water stress management through continued research and development.

Keywords

fruit tree water stress, near-infrared, orchard, spectroscopy, thermal imaging

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