过磷酸钙(简称“过石”)怎样使用效果好?我们作过马粪、过石混合发酵,农肥、过石混施,过石掺秸秆肥发酵,搞氨化过石等几种试验。结果以搞氨化过石效果最好。根据在周家大队的试验,施氨化过石的地块比马粪、过石发酵做口肥的,不仅小苗长得茁壮,一直到老秋都是秆青、 How to use the effect of superphosphate (referred to as “over the stone”)? We made horse manure, over the stone mixed fermentation, fertilizer, over stone mixed facilities, over straw stalk fat fermentation, engage in ammoniation stone and other tests. The results to engage in ammoniation over the best stone. According to the test of the brigade in Zhou, Shi ammoniated over the stone block than horse manure, Shi Shi fermentation to make fat, not only young seedlings grow, until the old autumn are stalks,