Relationship between Root Distribution in Different Soil Layer and Yield of Winter Wheat under Drought Stress

Through the control water experiment of five winter wheat new stains that were cultivated by Dryland Farming Institute of Hebei Academy of Agricultural and Forestry Sciences,the wheat root was gathered by using the sampling procedure-artificial small columns separated from the original soil completely.According to the root spatial distribution,the root samples in the soil layer different deeps(including three section:0-40 cm,40-80 cm,80-120 cm) at flowering stage in wheat were dug to measure the dry weight,and were harvested to measure yield in wheat wax maturity.By the correlation analysis between root dry weight of different soil layers of different stains and yield,the results showed that root dry weight of 0-40 cm,40-80 cm and 0-120 cm soil layers were negatively correlated with yield,but it was not significant.There was a significant(at 5% level) positive correlation between root dry weight of 80-120 cm soil layer and yield.It was proved in the further step that the winter wheat mainly used the deeper soil water to take action on the yield under drought stress.It had not obvious relation between root general mount with yield.