The characteristics of phosphorus adsorption and desorption in gray desert soil of Xinjiang, China

3rd International Conference on Agricultural and Biological Sciences

农业科学;生物科学

Wang, B.^1 ; Sun, J.S.^1 ; Liu, H.^1 ; Ma, Y.B.^2

Institute of Soil Fertilizer and Agricultural Water Saving, Xinjiang Academy of Agricultural Sciences, Urumqi

830091, China^1

National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing

100081, China^2

关键词: Adsorption and desorptions;    Adsorption capacities;    Agricultural productions;    Chemical fertilizers;    Concentration ranges;    Isothermal adsorption;    Long-term fertilization;    Phosphorus adsorption;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/77/1/012020/pdf
DOI  :  10.1088/1755-1315/77/1/012020

来源: IOP

【 摘 要 】

The characteristics of phosphorus (P) adsorption and desorption in Xinjiang gray desert soil (0 - 200 mm) of China in the long-term fertilization condition is affected by the level of soil P content which studied through an isothermal adsorption and desorption experiments of P. The results stated that within the experimental concentration range, with the increase of the amount of outer-source phosphorus, P adsorption, desorption and desorption rate increased and adsorption rate decreased gradually in different Olsen-P levels of gray desert soil in Xinjiang, China. Olsen-P content is significantly correlated with the P adsorption saturation (DPS) of gray desert soil. The maximum adsorption capacity (Xm) of the treatments followed an extremely significant decreasing order of CK>NPK≈NPKM>PK≈NPKS. The maximum buffer capacity (MBC) and adsorption constant (K) of the NPK treatment was much higher than NPKM, NPKS, PK and CK treatments. And, MBC value of CK treatment was extremely higher than NPKS and PK, however, the differences between NPKM and CK, NPKS and PK were not significant. The comparison between NPKM, NPKS, PK and CK treatments showed no significant difference in K value, but these four showed significantly lower than NPK treatments. The value of soil easy desorption P (RDP) of NPKS and NPKM was significantly higher than NPK and PK, and the chemical fertilizer with organic fertilizer was a best way to release the phosphorus for Xinjiang agricultural production, China.