Influence of different nitrogen application levels on the grain filling rate and yields of spring wheat
[Objective]The present study aims to clarify the regulatory effect of nitrogen fertilizer on wheat grain filling process and exploit the potentialities in enhancing the yields of spring wheat under drip irri-gation,aiming to provide a theoretical basis for the determination of suitable nitrogen application of different quality cultivars.[Methods]In this study,11 conventional varieties approved by Xinjiang and one strain un-der cultivation were used as test materials,and four kinds of nitrogen level treatment were set to study the effect of nitrogen application on grain filling characteristics and yield of different spring wheat varieties(lines).[Results]The results showed that the trend of grain filling rate of spring wheat under different nitro-gen application levels showed an"S"shape.When the accumulated dry matter weight of grain reached grain thousand seed weight,accumulated dry matter weight of productive grain was decreased with the increasing level of nitrogen application.However,the decreasing rate was slower.The results demonstrated that Xinchun 6,Xinchun 37 and Hechun 137 were strong grouting varieties,while Xinchun 11,Xinchun 21 and Xinchun 29 were weak grouting varieties.Under the low nitrogen level of 100 kg/hm2,the yield of Xinchun 17 and He-chun 615 reached the highest level.Under the medium nitrogen level of 200 kg/hm2,the yield of 8 wheat vari-eties,namely,Xinchun 6,Xinchun 11,Xinchun 26,Xinchun 29,Xinchun 37,Xinchun 39,Hechun 121 and Hechun 514,reached the highest level.Under the high nitrogen level of 300 kg/hm2,the yield of Hechun 137 and Xinchun 21 reached the highest level.[Conclusion]Under 4 different nitrogen application levels,the maximum grain filling rate was positively correlated with the average grain filling rate,and average grain filling rate was negatively correlated with total days of grain filling rate.Grain yields in per hectare was positively cor-related with thousand seed weight,maximum grain filling rate,average grain filling rate,days to reach the maximum grain filling rate,and total days of grain filling rate.
万方数据
维普
