Abstract:

Abstract： 【Objective】To accurately assess characteristic of winter wheat response to water in field.【Method】Based on the results of field experiments with different irrigations in 2007 and 2008, We analyzed applicability of drought resistance coefficient(DC), drought resistance index(DRI),drought yield index(DYI),water yield index(WYI),yield-high water use efficiency index(YWI) and water adaptive index of different moisture(WAI).【Results】DC reflected water sensibility. DRI could be used to screen varieties having both high yield at drought and weak response to irrigation. DYI conformed to the character of drought resistance. WYI expressed water use efficiency of wheat varieties. YHWUEI was good to choose varieties having high yield under drought and irrigation conditions. WAI was not fit for appraising water adaptive of all tested varieties. Yield coefficient (YC) was appropriate for screening drought-resistant varieties, high-yield varieties and high water use efficiency varieties.【Conclusion】Multi-index Evaluation Method of characteristic of winter wheat response to water in field, was put forward in this study. Based on choosing contrast and definite water conditions, we suggested that relative mean yield(RMY) of all irrigation treatments, revisionary drought yield index(DYRI) , revisionary water yield index(WYRI) , sensitivity index of stages(SSI) and revisionary yield index(YIR) could be used to identify yield, drought resistance, water use efficiency, water sensitivity and water adaptive. The concepts of DYRI, WYRI, SSI, YI and YIR also were introduced in this paper.