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目前我国氮肥的平均利用率为30%～45%。其中碳铵为27%～30%;尿素为30%～35%;硫铵为35%～45%。因此,要实行科学施肥,努力提高氮肥利用率。(一)合理分配氮肥品种氮肥的施用第一要考虑土地本身供氮水平,肥地应少施氮肥,而贫脊的田地需多施。要重视中、低产田地的氮肥施用。根据试验表明:中低产田每1公斤氮肥增产稻谷4.5公斤,小麦5.0公斤,玉米5.5
At present, the average utilization of nitrogen fertilizer in our country is 30% ~ 45%. Among them, ammonium bicarbonate is 27% -30%, urea is 30% -35% and ammonium sulfate is 35% -45%. Therefore, to implement scientific fertilization, and strive to improve the utilization of nitrogen fertilizer. (A) rational distribution of nitrogen fertilizer application of nitrogen First, to consider the level of nitrogen for the land itself, fertilizer should be less nitrogen fertilizer, and poor ridge fields to be applied. Should pay attention to middle and low yielding field nitrogen application. According to the experiment, the yield of 4.5 kg of rice, 5.0 kg of wheat and 5.5