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With nearly 10 years of multi-point test , study at different production levels , different densities , different varieties of types , different amount of organic fertilizer on the basis of nitrogen before shifting wheat yield formation and fertility characteristics , the results showed that: 1 emergence date in all growth stages of wheat before heading postponing N has no effect , the main difference between the performance of flowering in wheat heading to maturity , compared with the previous heavy nitrogen fertilization , combined with water after heavy nitrogen fertilization flowering stage undifferentiated or advance 1d, maturity generally postponed 1-2d, thus prolonging the grain filling stage . In the week before the mature one thousand daily gain was significantly higher than that of the control , and the final grain weight increased . This is mainly because of the backward before nitrogen can maintain grouting late flag leaf , second leaf higher chlorophyll content , grain filling stage higher leaf area index . 2 , yields 400kg or so , Mushi of N 20kg , reviving stage , jointing stage or anther period a certain proportion of N fertilizer topdressing than N fertilizer Basal increase the yield of the three elements of two by a flat ( or slightly reduced ). Per mu yield of around 500kg , jointing the ~ antherlobe period topdressing of N yields higher than the reviving stage dressing . With fertility levels and production levels increased , chasing N period should vary with after the shift , but still no later than flagging as well . If from the perspective of cost-effective , jointing stage antherlobe period the dressing best to flagging twice . The per mu 400kg, the basic seedling below normal ( 100,000 / acre ) conditions after heavy previous Nitrogen Application light way , conducive to increased acres into panicles, the promotion of the increase in production . Former nitrogen shift due to the reduction of the end of the amount of N fertilizer , reducing the maximum population , reduce the ineffective growth , effectively alleviate the jointing stage field shaded contradiction . In the late topdressing timely watering , can increase the rate of tillering , consolidate acres into panicles , increased grain number and grain weight , 4 , before nitrogen shift can shorten the base of the first , the length of the two , to improve its plumpness increase The Uppermost length . It also can improve the uniformity of the wheat plant and Sui . These results for multi- panicle varieties in panicle varieties are applicable . Panicle varieties and large grain varieties are not consistent .
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