饲用高粱不同品种及施氮水平对茎秆粗纤维积累的影响

Effects of Different Varieties and Levels of Nitrogen Fertilizer on Accumulation of Crude Fiber in Forage Sorghum Stalk

以天农青饲1号、天农青饲2号、苏丹草185和苏丹草175四种饲用高粱品种为材料,研究了施氮量对其茎秆粗纤维积累的影响。结果表明,不同施氮量下所有品种的粗纤维含量均呈现先降低后升高的趋势;总体上施用氮肥后能够显著提高粗纤维的含量,但不同品种对施氮的反应有所不同,天农青饲2号和苏丹草175的粗纤维含量随着施氮量的递增而有规律地递增,而天农青饲1号和苏丹草185某些发育阶段与之存在明显差异。

The experiment utilized four forage sorghum cultivars including Tiannong Qingsi No. 1, Tiannong Qingsi No.2, Sudangrass 185 and Sudangrass 175 as materials to study the effect of different nitrogen levels on accumulation of crude fiber in stalk. Results showed that the crude fiber content of all the cultivars under different nitrogen levels decreased firstly and increased subsequently. Generally, nitrogen fertilizer could increase the content of crude fiber distinctly, but responses of different cultivars to nitrogen levels were different. The content of crude fiber of Tiannong Qingsi No.2 and Sudangrass 175 increased by degrees with different nitrogen levels, and Tiannong Qingsi No. 1 and Sudangrass 185 were distinctly different from them in some growing stage.