前言我国华北大部及西北部份地区,大面积分布有发育于碳酸盐风化壳之上的石灰性土壤,长期以来,存在着土壤磷的固定及磷肥利用率不高的问题。成为这些地区农业生产中的一大隐患。一个时期以来,人们已逐渐重视施用大量农家肥料或种植绿肥及施用细菌肥料等,来改善土壤理化性状,从而提高磷的利用率。但终因肥源较困难,再加之气候干旱、矿化分解强烈,故尔此问题一直尚未得到较为妥善的解决。煤炭腐植酸有着与土壤腐植酸相似的结构,它也是由缩合程度不同的芳香族高分子 Foreword In most of North China and some parts of Northwest China, calcareous soil developed over a carbonate weathering crust is distributed over a large area. For a long time, there is a problem of soil P fixation and low phosphorus utilization rate. Become a major hurdle in agricultural production in these areas. Since a long period of time, people have paid more attention to the application of a large amount of peasant fertilizer or green manure and the application of bacterial fertilizer to improve the physical and chemical properties of soil and improve the utilization rate of phosphorus. However, the end result of fertilizer more difficult, coupled with the arid climate, mineralization strong decomposition, so this problem has not yet been more properly resolved. Coal humic acid has a similar structure with soil humic acid, it is also a different degree of condensation of aromatic polymers