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DOI:10.2136/sssaj2002.2033
Web URL(s):https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2002.2033
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Publication Type:
i
Refereed
Author(s):Maguire, R. O.; Sims, J. T.
Author Affiliation:Dep. Plant and Soil Sci., Univ. of Delaware, Newark, DE
Title:Measuring agronomic and environmental soil phosphorus saturation and predicting phosphorus leaching with Mehlich 3
Section:Division S-8 - Nutrient management & soil & plant analysis
Other records with the "Division S-8 - Nutrient management & soil & plant analysis" Section
Source:Soil Science Society of America Journal. Vol. 66, No. 6, November/December 2002, p. 2033-2039.
Publishing Information:Madison, Wisconsin: Soil Science Society of America
# of Pages:7
Keywords:TIC Keywords: Agronomic characteristics; Leaching potential; Mehlich-3 test; Phosphorus; Saturation; Soil properties; Soil testing
Abstract/Contents:"The role that soil testing can play in identifying agricultural soils with an increased potential for P loss is an important topic. Our research compared the Mehlich 3 P saturation ratio (M3-PSR) with the ammonium oxalate degree of P saturation (DPSox), and the M3-PSR was then evaluated for predicting agronomic and environmental soil P saturation thresholds. Intact soil columns (15-cm diam, 20 cm deep) and soil samples were collected from five soil series that ranged in soil texture, chemical properties, and Mehlich 3 P. The soils were analyzed for pH, organic matter (OM) and oxalate and Mehlich 3 extractable P, Al, and Fe. Each intact column was leached with the equivalent of 5 mm of rainfall and resulting leachate analyzed for P. Mehlich 3 extractable Al, Fe, and P were closely related to oxalate extractable Al, Fe, and P, although Mehlich 3 extracted only a small amount of Fe compared with oxalate. The M3-PSRs, calculated as the molar ratios of Mehlich 3 extractable P/[Al + Fe] (ratio I) and P/Al (ratio II), were well correlated to each other and to DPSox All three P saturation measurements showed a threshold or change point above which the concentration of P in column leachate increased rapidly. Both the agronomic optimum M3-PSRs and the environmental limit suggested in the Netherlands for DPSox (25%) were below the observed change point. The M3-PSR measured in a single Mehlich 3 extraction shows excellent promise for identifying soils that represent an increased risk for P leaching losses."
Language:English
References:32
Note:"Published as Paper No. 1709 in the Journal Series of the Delaware Agricultural Experiment Station"
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Maguire, R. O., and J. T. Sims. 2002. Measuring agronomic and environmental soil phosphorus saturation and predicting phosphorus leaching with Mehlich 3. Soil Science Society of America Journal. 66(6):p. 2033-2039.
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DOI: 10.2136/sssaj2002.2033
Web URL(s):
https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2002.2033
    Last checked: 02/29/2024
    Access conditions: Item is within a limited-access website
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2002.2033
    Last checked: 02/29/2024
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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