밭作物의 灌漑用水量 算定 : 大豆를 중심으로 for Soybean = Estimation of Irrigation Water for Upland Crop

다국어 초록 (Multilingual Abstract)

This study was carried out to determine the optimum irrigation level for upland crops especially soybean through the analysis of their evapo-transpiratiion, growth and yield. The optimum irrigation level for each upland crop will enable us to calculate the project irrigation requirement for a design year.
In this study, two varieties of soybean, Milyang 31 and Eunha, were cultivated in lysimeters in the farm of Chinju National University. The levels of irrigation were 29-26%, 25-22% and 21-18%, respectively. The soil moisture contents were maintained within a narrow range. From the experiment and analysis, the conclusions are derived as followings;
1. The numbers of branches, main stems and pods per plant, and the 100-grain weight of Milyang 31 and Eunha tended to increase as the irrigation level were changed from 21∼18% through 29-26% to 25-22%.
2. As the optimum irrigation level og 25-22%, the daily average evapo-transpiration of Milyang 31 and Eunha were 3.21㎜/day, 3.25㎜/day. The total evapotranspirations of Milyang 31 and Eunha were 276.23㎜, 312.11㎜.
3. The effective of the rainfall in the design year was 57.76% in case of Milyang 31 and 50.35% in case of Eunha. The net project irrigation requirements of Milyang 31 and Eunha were 288.23㎜ and 281.36㎜ respectively.
4. The intermittent irrigation days of both Milyang 31 and Eunha were calculated as 4days. The net irrigation requirement at a time was calculated as 28.72㎜, 29.04㎜ respectively.