| The test method was using Ota in this study, the early and late rice testing were selected Iseki rice transplanter test in 2014, were selected Iseki rice transplanter, consistent basal, tillering two nitrogen levels(N1~N4: 42.5kg / hm2, N5~N8: 25kg/ hm2),8different proportion of panicle nitrogen fertilizer(N1~N8: 0,20,50,80,17.5,37.5,67.5,97.5 kg / hm2),no fertilizer as control a total of nine treatment in heading tested once, secondary branch number and the number of spikelets differentiation degradation was measured at each growth stage determination of leaf area index, chlorophyll, dry weight of each plant organ and nitrogen content, yield and maturity determination factor; 2015 test early and late hybrid different disc seeding rate and conventional rice, rice CNS early 17 seeding rate75,85,95,115,125 g / disc, Zhuliangyou 189 seeding rate 55,65,75,85,95 g / dish, rice town11 rice seeding rate 75,85,95,115,125g/dish, preferably 722 Shengtai seeding rate45,55,65,75,85g/plate measuring quality of seedlings beforeafter transplanting and planting density investigation stump leak rate, recording a leaf site, tiller sites observed tiller dynamic and tillering rate, heading the investigation spikelets and panicle traits, dry matter yield and transport situation.Effects of Nitrogen application on population quality, yield components, dry matter accumulation, nitrogen utilization efficiency and physiological characteristics in double cropping rice. The influences on double cropping rice machine plug tillering characteristics and yield spike with different seeding rate. Fisstly, the yield Formation of Nitrogen Management on machine plug double cropping rice results show that Liang-you 819 deals of early rice strains yield was N3 and N4, moreover N4>N3, production reached 8000kg/hm2, blank treated as 5500kg/hm2; the effective panicles and each panicle of Nitrogen after shift were lower than Nitrogen forward, while grain weight under Nitrogen after shift more than those of forward treatment; furthermore, the high yield process of late rice H-you 518 was N4 and N7,N4>N7, fertilization yield of more than 9400 kg/hm2. Suitable Nitrogen fertilizer application and yield components coordination has higher seed rate and and panicle.Specific performance it were growth early and fast, becoming reasonable and effective ear, the more branches and spikelets, the large production accumulation of dry matter, the ability of absorb and fixation is stronger to nitrogen. Additionally, the higher leaf area indexes were maintained in Mid-term and late stage, the leaf SPAD of decline rate was slowed when the amount of nitrogen increased. The advantages of Nitrogen treatment with after shift obvious than those of forward treatment. The group dry matter accumulation and spikelets were favorable when Increase the amount of fertilizer in late stage, Accordingly, Production has increased significantly. N1 ~ N4 before jointing stage nitrogen accumulation and rapid accumulation of a large amount of the heading, thenitrogen accumulation than N5 ~ N8 slow and small processing. Partial plant productivity,nitrogen harvest index, nitrogen physiological efficiency, nitrogen rice production efficiency, nitrogen dry matter production efficiency increased with the increase of nitrogen showed a decreasing trend, nitrogen processing shift process forward after more than nitrogen.Secondly, in the impacts on population development and yield of machine insert double cropping with different seeding rate, early and late rice yield were expressed as a trend that first increased and decrease after with the increase of the disk seeding amounts.The highest yields of huliangyou 189 and Zhongjiazao17 was zu85 and zo95. However, the highest yield Zhendao 11 and Shengtaiyou 722 was 115 and se75. Analysis shows that tillering occurs mainly occur in the 0/3,0/4,0/5,0/6,0/7 primary tillers and a small amount of 1/3,1/4,1/5 secondary tillers. Tiller time and starting point of section bits was push benind, the absence of tillering was increased and spike rate was decreased with the seeding rate was increased. Hybrid rice of tillering and spike rate were better than conventional rice and their tillering time was advanced. Machine insertion section with the median amount of disk sowing rice field occurrence increases tillering decreased in each of the test process, reducing the amount of seeding seeding less than 1-2 hair tiller node of the secondary tillers and use significantly weakened. Tiller bit different compared with the spike, are 4-6 tiller incidence was significantly higher than the high spike tiller position and the secondary tillers, has proved the most suitable machine transplanting rice sector Tiller utilization.In addition, tillering node sites starting were ahead of one period, high incidence of tillering and tiller rate was also high... |
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