Effects of sulfur on the effectiveness of soil phosphorus under different water management conditions
In order to investigate the effect of sulfur on the phosphorus effectiveness in rice soil under dif-ferent water management conditions,an indoor soil simulation incubation experiment was conducted.The exper-iment featured four treatments:flooded (YS),flooded+sulfur (YS S),wet and dry (GS) and wet and dry+sulfur (GS S),which was performed by determining the soil pH,Eh,Fe2+,Olsen-P,inorganic phosphorus components,organophosphorus components,phosphatase activities,followed by correlation and analysis of the data.The re-sults showed that the soil Olsen-P content peaked at 30 days,and the Olsen-P content in YS treatment was the highest at 60 days of culture,which increased by 10.65% compared with YS.After 60 days of incubation,the Fe-P contents in YS and GS S treatments were higher than that in the group without sulfur treatment.The addition of sulfur under flooded conditions could reduce soil pH value,which was 0.05 units lower than that of the blank con-trol,and could significantly reduce soil Eh value,which was 12.85% lower than that of the blank control,that is,the addition of sulfur under flooded conditions promotes S to S2-reduction,and the LOP and MLOP contents in YS S treatment were significantly increased,while the MSOP content was significantly reduced.The addition of sulfur under flooded conditions increased the acid phosphatase activity in soil.The study concluded that the addition of sulfur under flooded treatment conditions is more conducive to the effective conversion of Ca-P and O-P to Fe-P in soil,effectively increasing soil LOP and MLOP content,and improving the phosphorus supply capacity of paddy soil,thereby improving the effectiveness of phosphorus in paddy soil.
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