Different Source Library Built On Accurate Nitrogen Application On Rice Yield And Nitrogen Utilization Physiology

In our country, the important factors that limiting rice yield increase is under-utilization of nitrogen of nitrogenous fertilizer. To solve this problem, super rice Shennong 265 (15 leaves in growth period) as the research material were tested by rice leaf age methods. Combined with the most appropriate amount of nitrogenous fertilizer in Liaoning Province-225kghm-2, and on the basis of reducing the amount of fertilizer (base fertilizer, fetilizer for tillering, fertilization for head sprouting), two proportion of fertilizer were set up, including basic tiller fertilizer:ear granule fertilizer in 6:4 and basic tiller fertilizer:ear granule fertilizer in 8:2. Super rice Shennong 265’s tiller dynamic, matter production, photosynthesis character and yield component was researched in this paper, has been clear about the Shennong 265’s best fertilization leaf about promote the tillers and keep the tillers in the tillering fertilizer period.the best fertilization leaf about promote the flowers and keep the flowers in the earing fertilizer period.Further determine the most beneficial combination of leaf with tillering fertilizer and earing fertilizer which is conducive to yields. To realize high rice nitrogen absorption, high utilization of the "double high" mode, to achieve high yield, and provide theoretical support for the construction of the rice reasonable Nitrogen mode.1. From the Shennong 265 tillering fertilizer and earing fertilizer leaf period, the mid-maturation rice Shennong 265, in the 2014,tillering and earing leaf combination of high-yield when 6:4 there are (8,12), (9,11), (9,12), (10,11), (10,12),8:2 there are (8,12), (9,11), (9,12), (10,12), (10,13); 2015,6:4 there are (7,13), (8,12), (8,13), (9,12), (10,12),8:2 there are (8,11), (8,12), (9,12), (10,12), (10,14); a comprehensive analysis by two years of data, most productive tillering leaf are 8 leaf,9 leaf,10 leaf, according to the former analysis has proven 9 leaf,10 leaf keep tillering (6 leaf,7 leaf promote tillering,8 leaf both), therefore, keep tillering than promote tillering greater role to increase Shennong 265 production; most productive earing leaf are 11 leaf,12 leaf,13 leaf, according to the former analysis has proved 11 leaf,12 leaf promote the flowers (14 leaf,15 leaf keep flowers,13 leaf both), so promote flowers than keep tillering greater role to increase Shennong 265 production.2. From base-tiller nitrogen fertilizer and ear granule fertilizer nitrogen application ratio come to see for Shennong 265, in 2014, the treatment of 6:4,photosynthetic characteristics processing in the full heading stage,the SPAD in the jointing stage and full heading, tillers rate, ear length, secondary branches stem number, secondary branch total grains, a secondary branch setting rate, primary branch grain weight, total spikelets more than 8:2, but the treatment 8:2photosynthetic characteristics in the tillering, tiller peak SPAD, primary branches, one branch total grains is higher than 6:4, plant height, effective panicles per unit area, a secondary branch grain weight and yield of theory but no significant difference. Therefore, the nitrogen back before for the Shennong 265 photosynthetic characteristics full heading stage, jointing stage and full heading SPAD, the rate of tillers, spike length, number of secondary branches, secondary branches per panicle, one, two second branch setting rate, primary branch grain weight, total spikelets increased.3. From the nitrogen uptake to see,when the base-tiller nitrogen fertilizer and ear granule fertilizer nitrogen application ratio is 6:4,Shennong 265 at harvest, leaves, and Ear accumulation of nitrogen and nitrogen accumulation, nitrogen uptake efficiency, physiological efficiency, overall agronomic efficiency ratio are higher than 8:2, but the soil nitrogen accumulation was low and nitrogen harvest index, partial utilization of the production was no significant difference in value;in the same group when the proportion of grain and fertilizer management, fertilizer grain on 11 leaf,12 leaf,13 leaf benefit the total nitrogen accumulation Shennong 265,nitrogen uptake efficiency, physiological efficiency, agronomic efficiency, nitrogen harvest index, partial improve the utilization of the production, the role of the magnitude relationship as follows:12 leaf> 11 leaf>13 leaf. Consistent with combinations of productive tillering fertilizer and grain.4. Field plot trials for secondary verification test field tube plant test, the test results broadly consistent with the field tube plant test, namely before and after nitrogen shift more conducive to optimizing the Shennong 265 Population Quality and Yield Components; in 2014, to promote tillering and Paul tiller balance of advantages and disadvantages as follows: 8 leaf> leaf 9> 7 leaves, in 2015, the rapid growth of tillering> maximum tillering stage> starts tillering; promoting and protecting flowers and flower balance of advantages and disadvantages as follows:12 leaves> 14 leaf,2015, floret differentiation> floret degeneration.