豫西旱地夏玉米农田水分动态变化及平衡研究

根据1992～1995连续4年的夏玉米农田土壤水分动态、水分平衡试验，研究了豫西旱地夏玉米田水分动态规律、需水规律及水分盈亏状况。结果表明：本区夏玉米田多年水分变化有4个阶段；夏玉米的需水量为369mm，4年试验水分满足率平均83．4呢，常年（30年资料）水分满足率为99．4%，个另11年份及生育阶段水分亏缺严重，在豫西是否种植应根据降水年型，特别是根据当年的底墒情况及夏玉米生育期间降水预测量来决定。

Research on Moisture Dynamic Changes of Summer Corn Farmland in Western Henan Drylandand Its Balance

Research has been done on law of the moisture dynamic change andwater demand as well as condition of moisture surplus and deficit in farmland ofsummer corn in western Henan dryland according to the experiment conducted in 4consecutive years from 1992 to 1995 on the moisture dynamic change of the summercorn farmland soil and its balance, the results indicate that there are 4 stages for themoisture changes of summer corn farmland in this region for many years, water demand of summer corn is 369mm, the water satisfaction rates in four years' test average 83. 5%, the water satisfaction rate in ordinary years (as per 30 years' data) is99. 4%. There is heavy water deficit in particular year and at growing stage.