Effects of Controlled Release Nitrogen Fertilizer Combined with Conventional Nitrogen Fertilizer On Nitrogen Accumulation,Nitrogen Use Efficiency and Yield of Continuous Summer Maize
A two-year fixed plot experiment was conducted in the major maize production area in Henan Province,6 controlled release nitrogen fertilizer(CRN)with conventional nitrogen fertilizer(N)treatments were arranged,includ-ing T1(100％ N),T2(25％ CRN+75％ N),T3(50％ CRN+50％ N),T4(75％ CRN+25％ N),T5(100％ CRN),and CK(no ni-trogen fertilizer),effects of CRN combined with N on nitrogen accumulation,nitrogen use efficiency and yield of con-tinuous summer maize.The results showed that the combination of CRN and N increased significantly grain yield,dry matter and nitrogen accumulation,and fertilizer use efficiency of summer maize,compared with single basal ap-plication of conventional nitrogen fertilizer,which were increased firstly and then gradually decreased with the in-crease of proportion of CRN.The nitrogen accumulation increased by 4.5％-1 1.2％ and 4.5％-15.6％ in the maturity stage,respectively,dry matter accumulation increased by 2.8％-17.6％ and 9.5％-18.6％,respectively,from 2019 to 2020.The treatment T3 and T4 improved the agronomic efficiency,apparent benefit efficiency,partial productivity a harvest index of nitrogen fertilizer.The grain yield of the controlled release nitrogen fertilizer combined with con-ventional nitrogen fertilizer increased by 4.4％-12.2％ and 5.4％-13.9％,respectively,the economic benefits in-creased 1-1 496 yuan/ha and 157-2 111 yuan/ha,respectively,compared with single basal application of conven-tional nitrogen fertilizer in 2019 and 2020.combined application of 75％ CRN and 25％ N could promote synergistic improvement of nitrogen use efficiency and yield in the treatment of nitrogen fertilizer level 225 kg/ha.
万方数据
维普
