In order to explore the effect of humic acid concentration on phosphorus transformation in soil,a constant temperature continuous cultivation experiment is conducted in a 25℃artificial climate box with monoammonium phosphate as the sole phosphorus source.A total of 9 treatments have been set up in the experiment,with no fertilization as the control(CK)treatment.From T1 to T8 treatments,humic acid with mass fractions of 0,0.1%,0.5%,1%,2%,5%,7%,and 10%is added sequentially.Soil samples are taken on the 5th,15th,30th,55th,80th,105th,130th,155th,and 180th day after cultivation to determine pH,available phosphorus,and various forms of inorganic phosphorus(Ca2-P,Ca8-P,Al-P,Fe-P,O-P,Ca10-P)content.The results show that the treatment of monoammonium phosphate+humic acid can effectively increase the content of various forms of inorganic phosphorus.When the amount of humic acid added is 7%,the impact on the transformation and activation of phosphorus is the greatest,the content of Ca2-P and Ca8-P are the highest,which are 79.30%and 61.41%higher than those treated with monoammonium phosphate,respectively.
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