The Effect of Water Deficit at Individual Growth Stages on the Yield and Water Requirement of Soybean (Glycine max [L.] Merr.)

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概要

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• An experiment was conducted to determine the effect of available water deficit at different growth stages on the yield and crop water requirement of soybean. This research was conducted in a plastic greenhouse of Agricultural Faculty, the University of Lampung from August to November, 2001. A factorial experiment was arranged in randomized block design with three replications. The period of available water deficit (S) was the first factor with four different growth stages, namely: early vegetative phase (S1), advance vegetative phase (S2), flowering phase (S3), and pod filling to maturity phase (S4). Available water deficit (D) was the second factor with four levels including: D2(20-40%), D3(40-60%), D4(60-80%), and D5(80-100%). The results showed soybean to be sensitive to water stress especially at S3 and S4, and the critical water content of these stages was around 50% of available water deficit or 0.26m^3/m^3(soil moisture suction was 120kPa). The values of water stress coeffisient (Ks) of the soybean at S2, S3, and S4 were 0.55, 0.57, and 0.27 respectively. The values of yield response factor (Ky) of SI, S2, S3, and S4 were 0.96, 0.42, 0.46, and 1.20 respectively. The water deficit at early vegetative (S1) and pod filling to early maturing (S4) was sensitive to the relative decrease of yield. The damage caused by water defict at early vegetative stage (S1) could recover by full irrigation (D1) after advance vegetative stage (S2). However, even small water deficit during pod filling to early maturing stage (S4) could strongly damage the yield of soybean. All the levels of water deficit (D1〜D4) at pod filling to early maturing stage (S4) decreased yield efficiency extremely, which means that the deficit irrigation applied after the pod filling stage could not be tolerated.

• 日本雨水資源化システム学会の論文

著者

• Senge Masateru

  Faculty of Applied Biological Science, Gifu University

• Ito Kengo

  Faculty of Applied Biological Science, Gifu University

• Adomako John

  Faculty of Applied Biological Science, Gifu University

• Ito Kengo

  Faculty Of Applied Biological Science Gifu University

• Adomako John

  Faculty Of Applied Biological Science Gifu University

• Senge Masateru

  Faculty Of Applied Biological Science Gifu University

• Bustomi Rosadi

  Faculty of Agriculture, University of Lampung

• Bustomi Rosadi

  Faculty Of Agriculture University Of Lampung

• Rosadi R.

  Faculty Of Agriculture University Of Lampung

関連論文

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• The Effect of Water Deficit in Typical Soil Types on the Yield and Water Requirement of Soybean (Glycine max [L.] Merr.) in Indonesia

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