The Effect Of Nitrogen Application And Efficient Fertilizer Mode On Following Rice Late Sowing Wheat During Spring

The experiment was conducted in the base of Agriculture College of the Yangzhou University during 2013 to 2015, taking wheat Yangmai 20 as materials, sowing time was November 12, 2013 and November 9,2014 respectively. Set of 3 different basic seedling density were 120 thousand,160 thousand and 200 thousand per 667 square meter, and setting 9 different spring leaf stage fertilizer combination:Using the no application of panicle fertilizer as control, setting the application of panicle fertilizer into twice topdressing combination of three, the top fourth leaf and second leaf fertilizer, the top third leaf and the last leaf fertilizer, and the top second leaf and booting stage fertilizer, the application of panicle fertilizer into one topdressing combination of five, only in the top fourth, third, second, first leaf, and booting stage dressing. The system was studied under the condition of wheat in Jiangsu area different sowing density and in spring leaf age top dressing on high yield of wheat yield formation and effect of the absorption and utilization of the panicle fertilizer nitrogen in the later growth period. All of these are aimed to provide experimental verification for the reasonable application of nitrogen in the late sowing wheat, and formed efficient fertilizer mode of late snowing wheat following rice in spring. The main results are as follows:1. In the experimental range, compare the three densities, in 160 thousand per 667 square meter basic seedlings conditions the yield of average reached 450 kilograms per 667 square meters. With the increase of planting density, the number of spike increased the number of grains per spike and the 1000-grain weight was decreased. In the 160 thousand per 667 square meter basic seedlings density, has the largest number of grain number per 667 square meters.2. In the spring, nitrogen fertilizer had a significant effect on increasing yield, application of twice topdressing in spring in the terms of yield was significantly higher than that of once. The difference between the twice topdressing treatments on the yield was not significant, but the yield at top second leaf and booting stage fertilizer was less. In the 200 thousand per 667 square meter basic seedling densities, in the third leaf and first leaf topdressing the highest yield than other treatments. In the 120 thousand and 160 thousand per 667 square meter basic seedling densities, in the fourth leaf and second leaf topdressing the highest yield than other treatments. Further to yield constitute factors analysis showed that, In the different leaf age fertilization has different effects on yield components. In spring the twice top dressing of the fertilization combination of spike number is higher than the once top dressing, between the spring and two fertilization combinations are compared with each other; in the 120 thousand and 160 thousand per 667 square meter basic seedling densities, the top fourth leaf and the second leaf combined have the highest spike number; in the 200 thousand per 667 square meter, the top third leaf and the first leaf combined have the highest spike number. In 120 thousand per 667 square density conditions with fertilization time delay per panicle number will continue to reduce, in 160 thousand and 200 thousand per 667 square densities under the condition of the combination of per spike grain number difference is small. The 1000-grain weight of the difference was not obvious. In the spring, compare the once topdressing treatments, we found the early fertilizer, the higher yield, at top fourth or top third leaf stage fertilization has the best effect.3. In the spring fertilizer can significantly enhance the spike rate, twice topdressing treatment was significantly greater than that of a fertilization treatment. With the period of the first application of panicle fertilizer, it is beneficial to the growth of medium term compensation, and to increase the amount of dry matter accumulation in the period of flowering and maturity. Wheat in heading stage of high effective leaf area ratio and leaf area rate can be seen the entire fertilizer effective leaf area rate with top dressing time delay will continue to decrease, the difference was not significant. Twice topdressing treatment of high effective leaf area rate was obviously higher than that of a fertilizer treatment, each time topdressing treatment showed with top dressing time delay to reduce and increase the effect. Comparison of different leaf stage fertilizer combination of Grain-leaf ratio, after spring twice topdressing treatment of grain leaf ratio was significantly higher than that of a fertilization of Grain-leaf ratio.4. Comparison of different leaf stage the application of panicle fertilizer on following rice late sowing wheat nitrogen content, absorption of nitrogen and nitrogen absorption rate has an important effect. Under the different sowing density twice fertilization in spring significantly better than one topdressing treatments, with the spring after fertilizer application time delay, the wheat plants containing nitrogen rate and absorption of nitrogen amount and nitrogen absorption rate both decreased, and the top fourth leaf and top third leaf application of fertilizer can increase wheat nitrogen fertilizer utilization rate.