紫云英还田与有机肥配施对中安7号产量及氮素利用的影响OA

This study aims to investigate the effect of Chinese milk vetch incorporation combined with organic fertilizer on the grain yield formation and nitrogen use efficiency of early rice in Southern China.The early rice variety'Zhong'an 7'was planted in this study.With no nitrogen application as control(CK),this study designed four treatments:chemical fertilizer(NPK),combined application of organic and chemical fertilizers(NPKM),combined application of Chinese milk vetch and chemical fertilizers(NPKV),and combined application of Chinese milk vetch with both chemical and organic fertilizers(NPKMV).The grain yield,yield components,dry matter accumulation,harvest index,and nitrogen use efficiency were compared among treatments.The results showed that compared with CK,NPK,NPKM,NPKV,and NPKMV increased the grain yield by 59.0%,59.9%,69.6%,and 63.8%,respectively.There were no significant differences in grain yield,dry matter accumulation or harvest index among different fertilization treatments.The NPKV and NPKMV treatments improved the nitrogen uptake efficiency by 22.4 and 21.8 percent points,agronomic nitrogen use efficiency by 13.8 and 11.5 kg/kg,and partial factor productivity of nitrogen by 29.8 and 27.5 kg/kg,respectively,compared with the NPK treatment,respectively.In conclusion,under the condition of full straw returning to the field,the combined application of Chinese milk vetch and chemical fertilizer,as well as that of Chinese milk vetch and organic and chemical fertilizers,could improve the nitrogen use efficiency of'Zhong'an 7',and maintain high rice yield.