Effects of Straw Returning and Basal/Topdressing Ratio of Nitrogen Fertilizer on Grain Yield and Nitrogen Efficiency of Winter Wheat
The study aims to investigate the effects of straw returning and basal/topdressing ratio of nitrogen fertilizer on winter wheat yield and nitrogen use efficiency,and to determine the optimal nitrogen fertilization pattern under straw returning conditions.The experiment used the wheat variety'Jimai 22'as test material,and employed a split-plot design.The main plots consisted of two straw treatments:no straw returning(S0)and straw returning(S1).Sub-plots included three nitrogen fertilizer ratios:7∶3(T1),5∶5(T2)and 3∶7(T3),with a nitrogen application rate of 240 kg/hm2.Nitrogen blank controls were set up with no nitrogen fertilizer applied under both straw returning and no straw returning conditions.The results indicated that compared with no straw returning,straw returning increased nitrogen use efficiency and nitrogen harvest index of winter wheat,with the largest increase observed in the T1 treatment,reaching 11.08％and 5.21％respectively.When straw returning was combined with a higher proportion of base fertilizer,the yield was higher than that of no straw returning,with an increase of 13.36％.Conversely,when combined with a lower proportion of base fertilizer,the yield was lower than that of no straw returning,with the highest yield achieved with a nitrogen fertilizer ratio of 7∶3.It is suggested that in regions similar to the conditions of this experiment,increasing the proportion of base fertilizer under straw returning conditions is a feasible approach to balancing yield and environmental considerations.
winter wheatstraw returningnitrogen efficiencybasal/topdressing ratio of nitrogen fertilizernitrogen use efficiencygrain yield
万方数据
维普
