Effects of Nitrogen Application Rate and Fertilizer Ratio on Population Growth and Yield of Rice
Using Y Liangyou 911 as the material,a two-factor split-plot experimental design with the nitrogen application rate(N1,N2 and N3 of nitrogen rate at 120,180 and 240 kg/hm2,respectively)in the main plots and the fertilizer ratio(F1 and F2 of NPK ratio at 1.0∶0.5∶1.0 and 1.0∶0.6∶1.2,respectively)in the sub-plots,was adopted to study the effects of nitrogen application rate and fertilizer ratio on the population growth and yield of rice.The results showed that fertilization significantly increased the yield of rice,and the yield of each nitrogen application treatment was increased by 52.81％～81.53％compared with the non-nitrogen application treatment(CK).The yield of N3 and N2 treatments was significantly higher than that of N1 treatment,while there was no significant difference in yield between F2 and F1 treatments.The yield of N2F2 treatment was the highest(9.04 t/hm2),which was not significantly different from that of N3F2 and N3F1 treatments,but significantly higher than that of other treatments.The correlation between yield components and yield was as follows:the number of effective panicles,the total number of spikelets per panicle,the seed setting rate and the 1 000-grain weight.The leaf area index of N2F2 treatment was 7.52％～106.50％and 5.88％～122.77％higher than that of other treatments at full heading stage and milky maturity stage,respectively,and the total dry matter accumulation in shoots of each treatment was higher in N3F2,N3F1 and N2F2 treatments from full heading stage to maturity stage.The population growth rate was highest in N2F2 treatment from milky maturity stage to maturity stage.In summary,N2F2 treatment can effectively regulate population growth,obtain higher population quality and achieve the effect of fertilizer saving and yield increase.
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