Effect of the irrigation systems of winter wheat on the soil storage water utilization

At sowing date,there is 619.6mm soil storage water and 329.5mm available storage water in whole soil profile of 200cm. From sowing to jointing stages,the water consumed by wheat plants is main from 0～100cm soil layer,and there is no soil water deficit at jointing stage even in non-irrigated treatment (CK).From jointing to flowering stages,the consumed water came from whole soil profile of 200cm in CK,while the treatment irrigated at upstanding stage(I-1) from the 160cm layer and the others from 130cm layer. At the flowering stage,light soil water deficit appeared in 0～60 cm layer in CK and I-1. From flowering to ripening stages, the consumed water came from whole profile but the most of them from 0～130cm layer. And at ripening stage,serious soil water deficit appeared in the 0～80cm or 0～60cm soil layer of the non-,one or two-irrigated treatments but the three or four-irrigated ones. In a word, the more the water is irrigated,the less the soil storage water will be utilized.