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通过田间小区试验，研究石灰性土壤条件下磷酸一铵在麦、棉轮作中对当季作物和下茬作物产量的效应。结果表明，磷酸一铵在当季作物上增产显著，对下茬作物也有一定的残留效果。磷酸一铵在大麦上的最适用量为２２５ｋｇ／ｈｍ２，当大麦的磷酸一铵施用量达到或超过１８０～２１０ｋｇ／ｈｍ２时，下茬棉花就可不施磷肥。
Field trial was conducted to study the effect of monoammonium phosphate on crop yield and crop yield under wheat and cotton rotation under calcareous soil conditions. The results showed that monoammonium phosphate had a significant yield increase on the current season crops and a certain residual effect on the next crop. The optimum amount of monoammonium phosphate on barley is 225kg / hm2. When the amount of monoammonium phosphate applied to barley reaches or exceeds 180-210kg / hm2, the next crop of cotton can be dephosphorized.