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1.存在的问题(1)利用率不高,经济效益低我省化肥利用率,氮肥约30%～35%(其中碳酸氢铵为20%左右),施用1公斤尿素只能增产2公斤粮食。而日本等发达国家氮素利用率平均达60%以上,日本的包膜肥料中的氮素利用率可高达80%以上。我省由于雨水充沛,钾肥流失也十分严重。我省化肥利用率不高的原因主要是由于:①易分解挥发的碳酸氢铵使用比例较高;②复混肥使用比例过低,发达国家复混肥一般占化肥总施用量的50%～70%。③复混肥几乎全为混合型复肥,氮磷钾含量固定,
1. Existing problems (1) utilization is not high, low economic efficiency I province fertilizer use efficiency, nitrogen fertilizer about 30% to 35% (of which ammonium bicarbonate is about 20%), application of 1 kg of urea can only increase 2 kg of food . In Japan and other developed countries, nitrogen utilization rates average more than 60%. Japan’s nitrogen fertilizers in coated fertilizers can reach as high as 80% or more. Due to the abundant rainfall in our province, the loss of potash is also very serious. The reasons for the low utilization rate of fertilizer in our province are mainly as follows: ① the proportion of volatile ammonium bicarbonate used is high; ② the proportion of compound fertilizer used is too low, and the compound fertilizers in developed countries generally account for 50% 70%. ③ almost all compound fertilizer compound fertilizer, nitrogen, phosphorus and potassium content is fixed,