| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
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| Outline of Final Research Achievements |
Two types of irrigation system were designed to simulate an increase in soil water content along soil depth under rain fed drought conditions. The type 1 is that irrigation tubes of one meter are inserted into soils and water is supplied from small holes at different distances (0-0.9m) from the soil surface. The type 2 is that irrigation tubes of different length suppling water from the tube tip are inserted into soils. The type 1 and 2 was tested in sandy field under rain protect shelters in Tottori and in Western Australia where two rice and spring wheat cultivars having different root depth were grown, respectively. Soil water contents increased with an increase in soil depths and higher dry matter at harvest, stomatal conductance and SPAD value in the deep root cultivar were maintained. In type 1, the effect of water excess in the full irrigate plots was observed. The irrigation system 2 would be available for evaluation of deep root system as drought escape of crops.
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