Critical water content and water stress coefficient of soybean (Glycine max [L.] Merr.) under deficit irrigation |
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Authors: | R. A. Bustomi Rosadi Afandi Masateru Senge Kengo Ito John T. Adomako |
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Affiliation: | (1) Faculty of Agriculture, University of Lampung, Jl. Sumantri Brojonegoro 1, Bandar Lampung, 35145, Indonesia;(2) Faculty of Applied Biology, Gifu University, 1-1 Yanagido, Gifu 501-1198, Japan |
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Abstract: | The objective of this research was to investigate the critical water content (θ c) and water stress coefficient (K s) of soybean plant under deficit irrigation. This research was conducted in a plastic house at the University of Lampung, Sumatra in Indonesia from June to September 2000. The water deficit levels were 0–20%, 20–40%, 40–60%, 60–80%, and 80–100% of available water (AW) deficit, arranged in Randomized Completely Block (RCB) design with four replications. The results showed that the soybean plant started to experience stress from week IV within 40–60% of AW deficit. The fraction of total available water (TAW) that the crop can extract from the root zone without suffering water stress (p) was 0.5 and θc was 0.305 m3 m−3. The values of K s at p=0.5 were 0.78, 0.86, 0.78, and 0.71 from week IV to week VII, respectively. The optimum yield of soybean plant with the highest yield efficiency was reached at 40–60% of AW deficit with an average K s value of 0.78; this level of deficit irrigation could conserve about 10% of the irrigation. The optimum yield of soybean plant was 7.9 g/pot and crop water requirement was 372 mm. |
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Keywords: | Yield efficiency Yield response factor Water stress efficiency |
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