Inorganic phosphorus in a regosol (purple) soil under long-term phosphorus fertilization

doi:10.11686/cyxb2015509

Abstract

Abstract: The Jiang Bofan-Gu Yichu Inorganic Phosphorus Grading System was used to grade measurements of different inorganic phosphorus forms in the 0-100 cm soil layer under a long term (22 years) fertilizer application trial.Total phosphorus, available phosphorus and inorganic phosphorus all increased in soils receiving long-term application of chemical phosphate fertilizer and treatments combining organic and chemical fertilizer [pig manure+NPK (M+NPK)].Available phosphorus increased by a factor of six while available phosphorus, total phosphorus, and various forms of inorganic phosphorus reduced in soil without fertilizer. In addition the Fe-P and Ca₁₀-P content in the lower soil layers were higher than those in the upper layers; the same trend was apparent in all inorganic phosphorus forms. The distribution profiles for inorganic phosphorus including Ca₂-P, Al-P, Ca₈-P, and O-P were similar, all reduced rapidly between 20-60 cm soil depth but few changes were observed at 80-100 cm depth. The relative contribution of various forms of inorganic phosphorus to soil phosphorus was Ca₂-P(0.9569)>Al-P(0.9265)>Ca₈-P(0.9100)>Fe-P(0.8277)>Ca₁₀-P(0.7449)>O-P(0.7362). Long-term application of organic and inorganic fertilizers to regosol soil could significantly increase the accumulation of phosphorus, suppress phosphorus fixation, enhance phosphorus mobility and improve phosphorus use efficiency.

HAN Xiao-Fei, GAO Ming, XIE De-Ti, WANG Zi-Fang, CHEN Chen. Inorganic phosphorus in a regosol (purple) soil under long-term phosphorus fertilization[J]. Acta Prataculturae Sinica, 2016, 25(4): 63-72.

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