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硫铵、尿素等化肥通常采用表层撒施作稻田的追肥。用这种方法施在田里的化肥,被水稻吸收利用的只有30～50%,一半以上的氮素被挥发损失掉了,如果施用碳酸氢铵,挥发损失就更多,这是一个很大的浪费。1972年湖南农科院土肥组在长沙、衡山、益阳等地,同贫下中农一道进行化肥深施的科学试验,先后进行了50多个田间对比试验和5000多亩大面积示范,结果证明,化肥深施比表层撒
Ammonium sulfate, urea and other fertilizers are usually topsoil topdressing paddy top dressing. Fertilizers applied to the fields by this method are absorbed and utilized by rice by only 30-50%, and more than half of the nitrogen is lost by volatilization. If ammonium bicarbonate is used, there is more volatilization loss, which is a very large Waste. In 1972, Hunan Academy of Agricultural Sciences soil and fertilizer group in Changsha, Hengshan, Yiyang and other places, with the poor middle peasants carried out a chemical fertilizer deep application of scientific experiments, has conducted more than 50 field experiments and 5,000 acres of large area demonstration, the results show that fertilizer Deploy deeper than the surface sprinkle