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化学氮肥在农业总投资中占有相当大的比重,计量施用氮肥不仅可以获得农作物高产,而且可取得最佳经济效果。要做到化学氮肥的计量施用,必须掌握以下四个参数:1.农作物需氮量:农作物在构成自体完整组织时,要吸收一定量的氮素。资料表明,形成100斤经济产量(如玉米的籽粒,马铃薯的块茎等)的需氮量是:水稻2.1～2.4斤,小麦:3.0斤,玉米2.57斤,谷子2.5斤,高粱2.6斤,大豆7.2斤,马铃薯0.5斤,甘薯0.35斤,油菜5.8斤。
Chemical nitrogen fertilizer accounts for a large proportion of the total agricultural investment. Measuring and applying nitrogen fertilizer can not only achieve high yield of crops, but also achieve the best economic results. To achieve the measurement of chemical nitrogen fertilizer application, must grasp the following four parameters: 1. Nitrogen demand for crops: crops constitute a self-organization, to absorb a certain amount of nitrogen. The data shows that the nitrogen requirement for forming 100 kg of economic output (such as kernel of corn and tuber of potato) is 2.1-2.4 kg for rice, 3.0 kg for wheat, 2.57 kg for corn, 2.5 kg for millet, 2.6 kg for sorghum and 7.2 for soybean Kg, 0.5 kg potato, 0.35 kg sweet potato, rape 5.8 kg.