欺天公社平房大队前年冬天在黄粘土坡地上修梯田20亩。由于冬季施工,冻土坷垃大,切垫土方量大,打乱了熟土层。为了确保新修梯田当年增产,他们经过认真分析,发现,在过去由山上冲下来的白浆土上,庄稼长得格外好的原因,是由于这种白浆土是含磷岩石风化物,也就是磷肥土。 Chetian commune bungalow brigade the previous year in winter on the clay hill slopes to repair 20 acres of land. Due to the construction in winter, the permafrost is large and the amount of earth and soil cut by the cutting pad is large, disrupting the mature soil layer. In order to ensure the increase of newly-built terraces that year, they carefully analyzed and found that the reason why the crops grew exceptionally well on the white earth washed down from the mountains was that this white earth was a rock containing phosphorus and also Is phosphorus soil.