堆放农家肥，尤其是堆放人粪、鸡粪、猪粪时，经常会闻到刺鼻的氨味，这就是粪肥中的氨气在挥发。氨气挥发，不仅污染了空气，而且粪肥中的氮素养分也随之损失掉了。但是，如果在堆放粪肥的过程中，根据农作物施肥量，加入少量的过磷酸钙，搅拌均匀后再进行堆沤，不仅可以防止 Manure is piled up, especially in the accumulation of human excrement, chicken manure, pig manure, often smell the pungent smell of ammonia, which is the ammonia in the manure volatilization. Ammonia volatilizes, not only contaminating the air, but also losing nutrients in manure. However, if in the process of manure deposition, according to the amount of crop fertilizer, adding a small amount of superphosphate, stir and then piling, not only can prevent