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关于石灰性土壤中腐植质与磷的吐纳关系,许多学者曾进行过研究,但看法并不一致。有的认为腐植质能减少磷在石灰性土壤中的固定,促进磷的释放,提高磷肥的有效性,但也有人认为腐植质对提高石灰性土壤中磷的活性作用是微不足道的。然而根据生产实践表明,磷肥与有机肥料配合使用可取得较好效果。我们用(32)~P对这个问题进行了一些研究,所得结果对进一步认识这个问题有一定启发。一、腐植质对磷在石灰性土壤中吸附自由能的影响吸附自由能根据以下公式测定:
Many scholars have conducted studies on the relationship between humus and phosphorus in calcareous soil, but the opinions are not consistent. Some people think that humus can reduce the fixation of phosphorus in calcareous soil, promote the release of phosphorus and improve the efficiency of phosphate fertilizer. However, it is also considered that the humic substances play a negligible role in enhancing the activity of phosphorus in calcareous soils. However, according to the production practice shows that phosphate fertilizer and organic fertilizer can be used with better results. We use (32) ~ P on the issue of some research, the results obtained for further understanding of this issue has some inspiration. First, humus on phosphorus in calcareous soil adsorption free energy adsorption free energy determined according to the following formula: