Study on adsorption-desorption characteristics of polyphosphate in gray desert soil and latosol soil
The phosphorus adsorption-desorption characteristics of polyphosphate with different degree of polymerization in two different types of soil were studied,which provided a theoretical basis for the analysis of fertilizer efficiency differences of polyphosphate fertilizer and the application of agricultural phosphorus fertilizer.Taking gray desert soil in the north and Latosol in the south as the test soil,and conventional water-soluble phosphate fertilizer(DAP)as the control,the adsorption and desorption characteristics of phosphorus in two kinds of soils with different degrees of polyphosphate(APP1,APP2,APP3,KTPP)were explored,and the relationship between the physical and chemical properties of different soils and the amount of phosphorus adsorption desorption was further explored.The results showed that in acid soil,the phosphorus adsorption capacity of each treatment soil was in the order of APP2＞APP3＞KTPP＞APP1＞DAP,and the phosphorus desorption capacity in soil was in the order of APP1＞KTPP＞DAP＞APP3＞APP2;In gray desert soil,the phosphorus adsorption capacity of each treatment was in the order of APP2＞APP1＞APP3＞DAP＞KTPP,and the phosphorus desorption capacity of soil was in the order of KTPP＞APP1＞DAP＞APP3＞APP2.The contents of soil clay,iron and aluminum oxides in soil physical and chemical properties parameters were positively correlated with the maximum phosphorus adsorption capacity(Qm).Soil pH,organic matter and calcium carbonate content were negatively correlated with Qm.To sum up,higher degree of polymerization polyphosphate(KTPP)has weak phosphorus adsorption capacity in gray desert soil and high soil phosphorus availability,while lower degree of polymerization polyphosphate(APP1)has weak phosphorus adsorption capacity in acid soil and can maintain good soil phosphorus balance and supply capacity.The higher the soil pH,organic matter and calcium carbonate content,the lower the soil clay and iron aluminum oxide content,the lower the soil phosphorus adsorption capacity,the higher the phosphorus desorption,and the higher the soil phosphorus availability.
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