高产麦田后期喷氮对产量与品质的影响

Effects of Spraying Nitrogenous Fertilizer in Later Growth Stage on the Yield And Quality for High-yield Wheat

1986——1988年的研究表明,高产麦田生育后期叶面喷施氮肥,明显地提高了籽粒蛋白质含量与蛋白质产量;喷施2％的尿素与2％的硫酸铵,蛋白质的增加幅度基本相近。自孕穗期以后随着喷氮时期的后延,籽粒蛋白质含量逐渐提高,而产量基本相平或略有下降,但均略高于对照,千粒重和容重也与产量有相似的趋势。高产麦田应尽量施足底肥,控制中、后期根施氮肥,使小麦在生长后期略呈脱氮现象,然后叶面喷施氮肥,可避免倒伏,并达到高产优质兼顾的目的。

There successive years'experiments showed that the protein content and the protein yield increased obviously by spraying nitrogenous fertilizer on the surface of leaves for high-yield wheat in later growth stage, and the increased extent by spyaying 2 percent urea solution was approximately the same as that by spraying 2 percent ammonium sulphate solution .Along with the delaying of sprayings, the protein content of seeds increased gradually since ear forming stage, but the yield of wheat differ uflobviously, The weight per thousand grains and the unit weight of wheat have similar tendency to the yield.in order to prevent high-yield wheat from lodging, the experiments showed that sufficient fertilizer should be applied and the amount of nitrogenous fertilizer applying to soil in the middle-later stage decreased so as to make the wheat lack nitrogen slightly, then nitrogenous fertilizer solution be sprayed on the leaves to provied nutriut to plants to stimulate the synthesis of protein in seeds, and gain high yield and top quality.