不同沟灌方式下夏玉米单作物系数试验研究

Experiment on Single Crop Cofficient of Summer Maize under Different Furrow Irrigations

摘要:

采用FAO推荐的单值作物系数法，对常规沟灌和控制性交替隔沟灌溉两种灌水方式下不同水分处理（水分控制下限为田间持水率的80%、70%、60%）的夏玉米作物系数进行研究。结果表明：灌水方式修正系数可用相对蒸腾量来表示，与播后天数具有良好的6次函数关系，相关性显著；两种沟灌方式的单作物系数呈现相同脉冲波动变化趋势，但交替隔沟灌的作物系数小于常规沟灌；利用单作物系数法计算作物需水量与实测值相比偏差均低于10%，吻合良好。

Abstract:

Different water treatments（80%，70% and 60% of field water holding）of summer maize crop coefficient under conventional furrow irrigation and controlling alternative furrow irrigation by using single crop coefficient method FAO recommended were studied. The results showed that irrigation pattern correction coefficient was available to be indicated by the relative amount transpiration and having a good relationship of 6 times a function with the days after sowing. With different furrow irrigation ways，single crop coefficient showed the same pulse fluctuations trend，but in alternative furrow irrigation crop coefficient was smaller than conventional furrow irrigation. The crop water requirement deviations between that calculated by using single crop coefficient method and the measured value were less than 10%，which was in good agreement.