Investigating the dynamics and distribution of soil phosphorus (P) fractions can provide a basis for enhancing P utilization by crops. Four treatments from a 29-year long-term experiment in black soil with maize cropping were involved in this study: no fertilizer (CK), inorganic nitrogen and potassium (NK), inorganic nitrogen, phosphorus, and potassium (NPK), and NPK plus manure (NPKM). We analyzed soil P fractions in different soil layers using a modified Hedley sequential method. The long-term NPKM treatment significantly increased total P by 0.6–1.6 times in the different soil layers. The Olsen-P concentration far exceeded the environmental threshold for soil Olsen-P (50.6 mg kg–1) in the NPKM treatment in the 0–60 cm soil profile. Moreover, the concentrations and proportion of labile and partially labile inorganic P (Pi) fractions (i.e., NaHCO3-extracted Pi, NaOH-extracted Pi, and dilute HCl-extracted Pi) to the sum of all P fractions (Pt) in the 0–60 cm soil profile were higher in the NPKM treatment than in the NPK treatment, indicating that manure could promote the transformation of non-labile into more labile forms of P in soil, possibly by manure reducing P fixation by soil particles. Soil organic matter, Mehlich-3 extractable iron (Fe), and organic-bound aluminum were increased by fertilization, and were the main factors influencing the differences in the P fractions in the 0–20 cm soil layer. Soil mineral components, i.e., free Fe oxide and CaCO3, were the main factors influencing the P fractions in the subsoil. The soil P transformation process varied with soil layer and fertilization. Application of manure fertilizer can increase the labile (Olsen) P concentrations of the various soil layers, and thus should reduce the mineral P fertilizer requirement for crop growth and reduce potential environmental damage.

WANG Qiong;QIN Zhen-han;ZHANG Wei-wei;CHEN Yan-hua;ZHU Ping;PENG Chang;WANG Le;ZHANG Shu-xiang;Gilles COLINET

Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land,Beijing 100081,P.R.China;TERRA,Gembloux Agro-Bio Tech,University of Liege,Gembloux,5030,Belgium;Institute of Plant Nutrition,Resources and Environment,Beijing Academy of Agriculture and Forestry Sciences,Beijing 100097,P.R.China;Agricultural Environment and Resources Center,Jilin Academy of Agricultural Sciences,Changchun 130033,P.R.China

农业科学学报（英文）

[1]WANG Qiong;QIN Zhen-han;ZHANG Wei-wei;CHEN Yan-hua;ZHU Ping;PENG Chang;WANG Le;ZHANG Shu-xiang;Gilles COLINET-.Effect of long-term fertilization on phosphorus fractions in different soil layers and their quantitative relationships with soil properties)[J].农业科学学报（英文）,2022(09):2720-2733

Mehlich

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