井渠双灌条件下玉米需水量研究

[目的]分析确定井渠双灌条件下玉米(Zea mays L.)生理指标变化规律、耗水规律及作物系数。[方法]针对井渠双灌对作物需水规律的影响,以内蒙古河套灌区主要作物玉米为研究对象,进行田间对比试验。试验共设10个处理,处理1～10的灌溉定额分别为150、225、300、293、293、286、286、279、279、272 mm。[结果]井渠双灌条件下玉米生长初期作物系数0.25、发育期0.69、生长中期1.14、生长后期0.58;玉米整个生育期需水量为599.57 mm。整个生育期内需水强度2.60～5.99 mm/d。[结论]该研究可为河套灌区井渠双灌模式的发展提供理论依据。

Study of Maize Water Requirement under Well-Channel Double Irrigation

[ Objective ] The aim was to analyze and confirm on the maize＇ s physiological index change rule, water consumption rule and crop coefficient under well-channel double irrigation. [ Method ] According to the crop water requirement rule under well-channel double irrigation, the main cultivation crop maize in Hetao Irrigation District of Inner Mongolia was chose as the research object to carry out the field contrast test. Ten treatments were designed, and their water irrigation duty was 150,225,300,293,293,286,286,279,279,272 mm resp.. [ Re- sult ] Under well-channel double irrigation, the crop coefficient of maize was 0.25 at the early growth stage, 0.69 at the development stage, 1.14 at the middle of growth period, 0.58 at the later period of growth period ; the water requirement amount and the water requirement density of maize total growth period was 599.57 mm and 2.60 -5.99 mm/d resp.. [ Conclusion] The study provides a theoretical basis for well-chan- nel double irrigation in Hetao Irrigation District.