A split plot experimental design was used to explore the effects of different nitrogen fertilizer management methods on the growth and development,yield,and nitrogen fertilizer utilization efficiency of ordered mechanical throwing late rice Jiayouchangjin.The main plot is the nitrogen application rate(N),with three levels set,namely 120 kg/hm2(N1),150 kg/hm2(N2),and 180 kg/hm2(N3).The sub plot is the distribution ratio of nitrogen fertilizer(base fertilizer:tillering fertilizer:spike fertilizer),with four levels set,namely 1:1:1(T1),0:1:1(T2),1:0:1(T3),and 1:1:0(T4).Using farmers'habitual fertilization as a control(CK,nitrogen fertilizer dosage of 120 kg/hm2,base fertilizer:tillering fertilizer:ear fertilizer=5:3:2),and another non nitrogen treatment as control 2(N0).The results showed that under the same nitrogen application rate,the rice yield of T2 treatment was significantly lower than that of T1,T3,T4 treatment and CK,the rice yield of T4 treatment was higher than that of T1 treatment and CK.It can be seen that the application of basic fertilizers helps to improve the yield of ordered mechanical throwing late rice.In terms of nitrogen fertilizer utilization,the nitrogen fertilizer utilization rate of T2 treatment was significantly lower than that of other treatments.The differences in nitrogen partial productivity(NPFP),nitrogen grain production efficiency(NUEg),nitrogen physiological utilization efficiency(NPE),and nitrogen harvest index(NHI)among T1,T3,T4 treatments and CK were relatively small.The above results indicated that the application of nitrogen fertilizer in the early stage had a significant regulatory effect on the growth and development,yield formation,and nitrogen utilization of ordered machine thrown late rice,while the effect of nitrogen fertilizer application in the later stage was relatively small.
late riceordered machine throwinggrain yieldnitrogen utilization efficiency
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