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在小麦生育前期施用氮肥不过量和苗株稳健生长的情况下,通过孕穗期重施氮肥,观察研究结实灌浆过程中植株各部位干物质积累的变化,得知中后期施用氮肥可增强叶片素质,提高后期光合效率、延长灌浆时间、千粒重明显增加.同时,茎、叶鞘也相应得到充实,使小麦后期的抗倒、抗“干热风”能力增强,并且从籽粒灌浆速度变化和千粒重增重过程看出,中后期追施氮肥即使过量,也没有出现贪青现象.
In the early stage of wheat growth, nitrogen fertilizer was applied excessively and seedling plants grew steadily. Through heavy application of nitrogen fertilizer at the booting stage, the changes of dry matter accumulation in various parts of the plant during the grain filling stage were observed. It was found that nitrogen application at middle and late stages could enhance leaf quality, Improve the photosynthetic efficiency in the late stage, prolong the filling time and significantly increase the 1000-grain weight.At the same time, the stems and leaf sheaths were correspondingly enriched, which increased the capacity of anti-down and anti-dry and hot winds in the late stage of wheat and from the grain filling rate and 1000-grain weight gain process Out, even in the late topdressing nitrogen fertilizer, there is no greedy phenomenon.