Study On The Difference Of Different Hybrid Rice Varieties To Reducing Nitrogen Application

In order to study the selection and reasonable fertilization of nitrogen-efficient hybrid rice in the northeastern Sichuan-based seasonal arid region,28 hybrid rice varieties were used as experimental materials for field experiment,10.0kg N / 667 ?,7.0kg N / 667 ?,4.0 Kg N / 667 ?,0.0kg N / 667 ?,from 10.0kg N / 667 ? reduce to 7.0kg N / 667 ?,4.0kg N / 667 ? and 0.0kg N / 667 ?.In order to investigate the effect of reducing nitrogen application on hybridization rice growth and development,spike economic traits and yield differences,screening out the use of high nitrogen efficiency varieties of its main results are as follows:1.Differences in stem and till number of different hybrid rice cultivars by reducing nitrogen fertilizer.The results showed that the number of tillers after 15 days of transplanting,the number of tillers and the maximum number of tillers after 15 days of transplanting were studied.The number of tillers after 5 days did not significantly affect the number of tillers and the maximum number of tillers after 15 days of transplanting.2.Reduced nitrogen on the differences of different hybrid rice yield performance.On the whole,reducing nitrogen of the hybrid rice yield or reduce,the effective spike,grain number and grain number and yield reached extremely significant level,but no significant effect on seed setting rate and grain.Reducing nitrogen to lower hybrid rice effective ear,N₇ compared with N₁₀ fell by 6.63% on average,the change range of-18.01% ^-0.87%,N₄ compared with N₁₀ interchange average fell by 12.63%,the change range of-20.70% ^-1.30%,N0 compared with N₁₀ average fell by 22.72%,the change range of-40.44% ^-13.01%;Nitrogen to lower hybrid rice with grain number,reducing N₇ compared with N₁₀ fell by 1.80% on average,the variation range of-19.60% 15.76%,N₄ compared with N₁₀ interchange fell by 3.20%,-17.84% 25.81%,and its changes in N0 compared with N₁₀ fell by 7.41%,the change range of-28.70% 23.28%;Reducing nitrogen reduce spikes in hybrid solid grain number,N₇ compared with N₁₀ fell by 1.56% on average,the variation range of-16.84% 16.74%,N₄ compared with N₁₀ interchange average fell by 1.99%,the variation range of-17.30% 27.13%,N0 compared with N₁₀ average fell by 7.97%,the variation range of-29.60% 14.78%;Reducing nitrogen effect on hybrid rice seed setting rate was not significant,N₇ compared with the N₁₀ rise by an average of 0.25%,the variation range of-2.47% 4.88%,N₄ compared with N₁₀ interchange by an average of 1.47%,the variation range of-0.76% 6.67%,N0 compared with N₁₀ average rise 0.06%,the variation range of-3.67% 6.83%;N₄ compared with N₁₀ interchange average fell by 0.46%,the variation range of-4.05% 3.21%,N0 compared with N₁₀ average fell by 2.22%,the variation range of-5.46% 1.09%;Reducing nitrogen reduce hybrid rice single ear but did not reach significant level,N₇ compared with N₁₀ fell by 0.88% on average,the variation range of-25.60% ¹6.90%,N₄ compared with N₁₀ interchange average fell by 1.79%,the variation range of-16.50% 26.20%,N0 compared with N₁₀ average fell by 9.14%,the variation range of-30.50% 14.6%;To sum up,reducing nitrogen makes effective ear largest decline of hybrid rice,the hybrid rice seed setting rate,spikelets per spike and decline was not significant.3.Reduced nitrogen on the differences of different hybrid rice production performance.Testing varieties from the whole,reducing nitrogen makes the theory of hybrid rice production is reduced,N₇ compared with N₁₀ fell by 7.26% on average,the variation range of-20.17% 12.70%,N₄ compared with N₁₀ the interchange average fell by 12.84%,the change range of-26.54% ^-6.58%,N0 compared with N₁₀ average fell by 29.55%,the change range of-49.33% ^-3.92%.From the point of different varieties N₇ increased compared with N₁₀ has Neixiang 6 You 498,Jingyou 127,Deyou 4727 and so on three varieties,with continuous optimal growth in Jingyou 127 is the largest,the relatively small decline mainly include Yixiang 4245,Yixiangyou 1108,Chuanyou 8377,Leyou 198,F you 498 F,Rongyou 918,Q you 28,two Y Liangyou 3399 and so on 8 varieties,illustrate the 11 varieties of rice yield under the N₇ processing level have higher yields or the relatively small cuts,Huaxiangyou 1 hao,Fuyou6688,Leyou 808 and Chuanyou 6203 etc.Four hybrid rice variety yield declines.Under the N₄ interchange processing level expressed continuous production was Jingyou127,Nei 7 you 39,Chuanyou 6203,Leyou 808 etc.N0 treatment show production.4.The difference between nitrogen fertilization and utilization rate of nitrogen agronomy and nitrogen partial productivity of hybrid rice.The utilization rate of nitrogen agronomy of hybrid rice was increased by 8.97 percent under N₁₀ treatment,utilization rate of nitrogen agronomy of hybrid rice was reduced by 9.59 percent under N₇ treatment.The nitrogen use efficiency of AE_N4 was 12.63.AE_N10 <AE_N7> AE_N4 have Yixiang4245,Yixiangyou 1108,Neixiang 6 you 498,Nei 7 you 39,Q you 28,Y Liangyou 973,Y Liangyou 3399 and so on.AE_N10 <AE_N7 <AE_N4 have Yixiangyou 2115,Chuanyou 8377,Leyou 198,F you 498,Jingyou 127,Rong 18 you 198,Rong 18 you 662,Rongyou 918,Deyou 4727,Deyou 146 and so on.Indicating that from the application of nitrogen fertilizer from 10.0 kg N / 667 ? reduced to 7.0 kg N / 667 ?,Yixiang 4245,Yixiangyou 1108,Neixiang 6 you 498,Nei 7 you 39,Q you 28,Y Liangyou 973,Y Liangyou 3399 and other seven varieties can make full use of soil nitrogen,nitrogen agronomic use of high efficiency,nitrogen fertilizer application from 10.0 kg N / 667 ? reduced to 4.0 kg N / 667 ?,the Yixiangyou 2115,Chuanyou 8377,Leyou 198,F you 498,Jingyou 127,Rong 18 You 198,Rong 18 You 662,Rongyou 918,Deyou 4727,Dexiang You 146 and other ten varieties can make full use of soil nitrogen,The nitrogen use efficiency of each cultivar increased with the decrease of nitrogen application rate,and the partial productivity of nitrogen fertilizer was negatively correlated with nitrogen application rate.