Effect of Water Stress on Dry-matter Partition of Winter Wheat

Under potted plant,using Lumai 23,winter wheat as specimen,experiments based on the research of water stress,Dry-matter accumulation,partition and yield of winter by different water stress from jointing sages to flowering stage was analyzed.The relationship between yield and evapotranspiation was built.The proportion of stem was low under the fitting water condition,there were 32% of stem and 39% of spike.But on the condition of high water stress and more water,the proportion of stem became higher and the proportion of spike was lower.On the condition of high water stress,the proportion of stem and spike were 43%and 34%,and when redundant water condition,the proportion of stem and spike were 43%and 27%,The contribution from stem to yield was 0.97 g/stem under the gravimetric soil water content 70%to 60%,on the condition of serious stress the contribution from leaves to yield were higher was 0.72 g/stem.The relationship between yield and irrigated evapotranspiration indicated that the highest theoretical yield was 0.62 kg/m2(6 200 kg/ha)in Taian city shandong province under present fertilizer and agronomic measure,The evapotranspiration at highest yield was 702.35 mm,the highest water use efficiency was 17.65%,The flowering and jointing stages are two periods during which winter wheat is especially sensitive to soil water.Attentions should be paid on management of soil water in the field during the flowering and grain filling stages.