期刊
GEODERMA
卷 274, 期 -, 页码 79-87出版社
ELSEVIER
DOI: 10.1016/j.geoderma.2016.04.002
关键词
Soil test phosphorus; Phosphorus sorption; Phosphorus loss; Langmuir equation; Degree of phosphorus saturation
类别
资金
- Nutrient Management Joint Research Program of the Ontario Ministry of Agriculture, Food, and Rural Affairs (OMAFRA)
- Ministry of the Environment [NM8002]
- OMAFRA
Compared with soil testing phosphorus (STP), such as Olsen P, the degree of P saturation (DPS) generally improves the risk prediction for soil P loss. This study was conducted to assess various P sorption indices (PSI) to indicate P sorption maximum (Q(max)) of soils, and their derived DPS indices as indicators of dissolved reactive P (DRP) concentration in soil leachate. A total of 236 intact soil columns were collected for leaching experiments from six major soil series in Ontario. By conducting the single-point isotherm, PSI-a of a given soil was determined as the amount of P sorbed by the soil during 24-h shaking in the 60 mg P L-1 solution, PSI-b as the quotient of PSI-a/log C, where C is the solution P concentration after 24-h shaking, and PSI-c as the sum of PSI-a and Olsen P concentration. Among the tested PSIs, PSI-c gave the best prediction of Q(max). Compared to Olsen P, soil DPS-1 (i.e. the quotient of Olsen P/PSI-c) improved the prediction of leachate DRP concentration. Moreover, soil pH did not impact the relationship of DPS-1 vs. soluble soil P loss. Based on the results from conditional probability analyses, Ontario soils were grouped into no risk, low risk, medium risk, and high risk categories. Considering that Olsen P is the current agronomic STP in Ontario and PSI-c can be quickly determined, soil DPS-1 can be used to identify leaching P loss and/or combined with site hydrology and P management practices for a more comprehensive soil P loss assessment. (C) 2016 Elsevier B.V. All rights reserved.
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