Profile Irrigation System Changing Soil Moisture Condition along Soil Depth for Evaluation of Drought Escape in Crop Plants

2015 Fiscal Year Final Research Report

• Project/Area Number: 25660018
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Crop production science
• Research Institution: Shimane University
• Principal Investigator: Kobata Tohru 島根大学, 生物資源科学部, 教授 (60186723)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 干ばつ / 灌漑装置 / 土壌深度 / 深根性 / イネ / 春コムギ

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.

Free Research Field

作物学