Effects of Controlled-release Blended Fertilizer on Yield,Nitrogen Absorption and Economic Benefits of Winter Wheat
In order to achieve chemical fertilizer rate reduction of application and increase efficiency,as well as the light simplification of win-ter wheat production,a 2-year continuous controlled release blended fertilizer experiment was conducted in the Modern Agricultural Science and Technology Park of Dezhou City from 2020 to 2022.Five treatments included:no nitrogen fertilizer application(T0),conventional nitrogen ap-plication(base fertilizer∶topdressing=1∶1,T1),optimized nitrogen application(base fertilizer∶topdressing=1∶1,T2),single basal applica-tion of controlled-release blended fertilizer including 50% controlled release nitrogen(T3)and 70% controlled release nitrogen(T4).The effects of different treatments on winter wheat yield,nitrogen utilization efficiency,and economic benefits were compared and analyzed.The re-sults showed that the nitrogen accumulation of winter wheat increased with the extension of growth period.Compared with conventional nitrogen application(T1 treatment),there was no significant difference in nitrogen content and nitrogen uptake of winter wheat in different growth stages with controlled release blended fertilizers(T3 and T4 treatments),while the yield increased by 4.1%,-5.4% (2021)and 5.9%,-1.0% (2022),respectively.Compared with T1 treatment,T3 and T4 treatments increased nitrogen use efficiency(NUE)of winter wheat by 7.3% to 27.1% and-8.6% to 30.3%,respectively,nitrogen agronomic efficiency(NAE)increased by 26.9% to 34.8% and 10.9% to 17.6%,re-spectively,nitrogen partial productivity(NPP)increased by 24.9% to 27.1% and 13.6% to 18.8%,respectively(P>0.05).The net benefits of controlled release blended fertilizers(T3 and T4 treatment)increased by 4.5%-7.0% (2021)and 0.4%-8.5% (2022)compared to conventional nitrogen application(T1 treatment),respectively.There is a significant(P<0.05)or extremely significant(P<0.01)positive correlation between winter wheat yield and effective panicle number,thousand grain weight,nitrogen accumulation,nitrogen fertilizer partial pro-ductivity,and nitrogen use efficiency.Considering the comprehensive yield,output value and net income,it is recommended to prioritize single basal application of blended fertilizer with 50% controlled release nitrogen fertilizer.
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