Comparative study on growth and development characteristics of winter wheat with different nitrogen use efficiency(NUE)

Two varieties,Xiaoyan 22 and Xiaoyan 6,were used in a field plot experiment to study the growth and development characteristics of winter wheat with different nitrogen use efficiency(NUE) by measuring yields,shoot and root biomass at different growth stages,some physiological items such as chlorophyll content,nitrate reduce enzyme activity of winter wheat leaves under two nitrogen rates comparatively.The results indicated that the nitrate reduce enzyme activity and the chlorophyll content were reduced significantly under the condition of no nitrogen application,but under the condition of nitrogen application,the senility of winter wheat leaf could be put off obviously.Therefore,the chlorophyll content could be kept at high level.As far as two kinds of genotypes selected,whether with or without nitrogen application,the physiological activity of Xiaoyan 22 was more exuberant than that of Xiaoyan 6,meaning that nitrogen application strengthened this function.These results will provide scientific basis for further selecting and breeding genotypes with higher nitrogen use efficiency.