Effects of nitrogen accumulation and translocation in different organs and their absorption and utilization of nitrogen under different nitrogen fertilizer rates and densities of super early rice

Nitrogen is one of the most important macro elements;nitrogen use efficiency is affected by variety,nitrogen application level,application method and water management.In this paper,super-hybrid Zhongjiazao17 for the material used for the field test to study nitrogen utilization,accumulation and translocation under four different nitrogen fertilizer rates(0,120,165,210 kg/hm2)and two densities patters(22.5×104 and 30×104 hole/hm2).The results showed that:the total nitrogen accumulation in rice was increased with the amount of nitrogen fertilizer and planting density increased,but the total nitrogen accumulation rate increased was different,when the amount of nitrogen from 120 kg/hm2(N1)to 165 kg/hm2(N2),the rate was increased significantly greater than the amount of nitrogen fertilizer from 165 kg/hm2(N2)to 210 kg/hm2(N3).N transfer efficiency of leaf was increased also with the amount of nitrogen fertilizer and planting density increased,N transfer efficiency was no difference among different treatment.Nitrogen agronomic efficiency(NAE),nitrogen partial factor productivity(NPFP)and physiological efficiency(NPE)positively corrected with plant nitrogen accumulation,we also found that when low-density planting of nitrogen NAE and NPE of nitrogen harvest were higher than high-density planting.