| The experiments were carried out to study the effects of irrigational amount, irrigational times and soil moisture control on yield and its component elements of spring wheat on two types of soil in arid desert region. The results show: (1) There was a strong positive correlation between total irrigational amount, irrigational times and soil water control level during whole growth period and yield and its component elements of wheat (P<0.01); (2) For spring wheat on anthropogenic-alluvial soil, the optimal total irrigational capacity was 4 590 m3/hm2, being equivalent to 45.9 mm in depth for 11 times or so; (3) For spring wheat on sandy soil, the optimal total irrigational capacity was 4 312 m3/hm2, being equivalent to 30.8 mm in depth for 14 times or so. |