Effects of Different Phosphorus Application Rates on Soil Phosphorus Adsorption-Desorption Characteristics in Wheat-Maize Cropping System
HE Yilong
ZHOU Wenli
CHANG Huiqing
Abstract：Based on a long-term experiment in Luoyang City,Henan Province,the characteristics of soil phosphorus adsorption-desorption under low phosphorus application rate treatment(P1:45 kg P2O5/hm2)and high phosphorus application rate treatment(P5:270 kg P2O5/hm2)in winter wheat-summer maize cropping system were investigated.The results show that high phosphorus treatment significantly increase soil available phosphorus content,reaching 19.41 mg/kg,which is 189％higher than that of low phosphorus treatment.The maximum adsorption capacity(Qm)of soil phosphorus in high phosphorus treatment decrease by 17.62％compare with low phosphorus treatment,and the phosphorus adsorption saturation(DPS)increase to 5.61％.Although it does not exceed the critical value of 25％leaching loss,it increase by 253％compare with low phosphorus treatment.The content of soil readily desorbable phosphorus(RDP)in high phosphorus treatment also increase by 157％compare with that in low phosphorus treatment,indicating that long-term high phosphorus application may aggravate the risk of phosphorus migration.The affinity constant(K)and maximum buffer capacity(MBC)of phosphorus adsorption between high phosphorus treatment and low phosphorus treatment do not change significantly,indicating that the soil phosphorus adsorption strength and buffer capacity are relatively stable.It is necessary to optimize the phosphorus application strategy in combination with regional annual precipitation to balance agricultural production efficiency and ecological security.
Keywords：soilphosphate fertilizeradsorptiondesorptionenvironmental risk
Publication Date：2025-06-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 91-96,104 )