Effect of Reduced Slow-release Fertilizer Application on Yield and Nitrogen Utilization Efficiency of Maize in Eastern Liaoning Province
To investigate the effects of reduced slow-release fertilizer application on maize growth and yield in eastern Liaoning province,a field experiment with 6 treatments was designed:no N fertilizer(CK);farmers'custom-ary fertilization(FP);40 kg slow-release fertilizer single basal application(SY40);750 kg/ha slow-release fertilizer single basal application(SY50);450 kg/ha slow-release fertilizer basal application+urea topdressing(ZN);450 kg/ha slow-release fertilizer basal application+300 kg/ha topdressing(ZS).The study examined the effects of different fer-tilization models on maize growth characteristics and dry matter accumulation dynamics.The results showed that,compared with FP,SY40and SY50 treatments had no significant reduction of yield.The average yield over two years was FP＞SY40＞SY50.There were no significant effects on spike number,kernels per spike,1 000-grain weight,empty stalk ratio and harvest index.These treatments could reduce plant height and ear position.The leaf area index(LAI)at different growth stages was not significantly affected.Dry matter accumulation at different growth stages showed no significant difference.So that the yield was equal to FP treatment.Additionally,PFPN was significantly in-creased,which is beneficial to promote the nitrogen uptake and utilization of plant.In summary,in eastern Liaoning,single basal application of slow-release fertilizer N-P2O5-K2O:156-60-72 kg/ha(SY40)or 195-75-90 kg/ha(SY50)could be used as a new model to substitute for famers'customary fertilization N-P2O5-K2O:240-75-90 kg/ha(FP).
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