Title: Relating Extractable Soil Phosphorus to Phosphorus Losses in Runoff
Abstract: Soil Science Society of America JournalVolume 60, Issue 3 p. 855-859 Division S-6—Soil & Water Management & Conservation Relating Extractable Soil Phosphorus to Phosphorus Losses in Runoff D. H. Pote, Corresponding Author D. H. Pote [email protected] Dep. of Agronomy, 115 Plant Sciences Building, Univ. of Arkansas, Fayetteville, AR, 72701Corresponding author ([email protected]).Search for more papers by this authorT. C. Daniel, T. C. Daniel Dep. of Agronomy, 115 Plant Sciences Building, Univ. of Arkansas, Fayetteville, AR, 72701Search for more papers by this authorP. A. Moore Jr., P. A. Moore Jr. Dep. of Agronomy, 115 Plant Sciences Building, Univ. of Arkansas, Fayetteville, AR, 72701Search for more papers by this authorD. J. Nichols, D. J. Nichols Dep. of Agronomy, 115 Plant Sciences Building, Univ. of Arkansas, Fayetteville, AR, 72701Search for more papers by this authorA. N. Sharpley, A. N. Sharpley USDA-ARS, P.O. Box 1430, Durant, OK, 74702Search for more papers by this authorD. R. Edwards, D. R. Edwards Agricultural Engineering Dep., Univ. of Kentucky, Lexington, KY, 40546Search for more papers by this author D. H. Pote, Corresponding Author D. H. Pote [email protected] Dep. of Agronomy, 115 Plant Sciences Building, Univ. of Arkansas, Fayetteville, AR, 72701Corresponding author ([email protected]).Search for more papers by this authorT. C. Daniel, T. C. Daniel Dep. of Agronomy, 115 Plant Sciences Building, Univ. of Arkansas, Fayetteville, AR, 72701Search for more papers by this authorP. A. Moore Jr., P. A. Moore Jr. Dep. of Agronomy, 115 Plant Sciences Building, Univ. of Arkansas, Fayetteville, AR, 72701Search for more papers by this authorD. J. Nichols, D. J. Nichols Dep. of Agronomy, 115 Plant Sciences Building, Univ. of Arkansas, Fayetteville, AR, 72701Search for more papers by this authorA. N. Sharpley, A. N. Sharpley USDA-ARS, P.O. Box 1430, Durant, OK, 74702Search for more papers by this authorD. R. Edwards, D. R. Edwards Agricultural Engineering Dep., Univ. of Kentucky, Lexington, KY, 40546Search for more papers by this author First published: 01 May 1996 https://doi.org/10.2136/sssaj1996.03615995006000030025xCitations: 474AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Phosphorus in agricultural runoff can cause accelerated lake and stream eutrophication. Where producers have applied P at rates exceeding crop uptake, soil P has sometimes become the main source of P in runoff. We hypothesized that soil test P (STP) correlation to dissolved reactive P (DRP) and bioavailable P (BAP) in runoff varies, depending on the extraction method. To investigate which STP extraction method would be best for predicting DRP and BAP concentration and load in runoff, soil samples were taken from the 0- to 2-cm depth of 54 grass plots (5% slopes) on Captina silt loam (fine-silty, siliceous, mesic Typic Fragiudult). The STP was extracted by six methods and the ranges of results (mg kg−1) were: 54–490 (Mehlich III), 27–592 (Bray-Kurtz P1), 25–169 (Olsen), 14–110 (distilled water), 23–170 (Fe oxide paper), and 105–1131 (acidified ammonium oxalate). The soil P saturation ranged from 16 to 80%. Simulated rain was applied at 100 mm h−1 and runoff was collected for 30 min. The concentration of DRP in total runoff ranged from 0.31 to 1.81 mg L−1, and BAP from 0.37 to 2.18 mg L−1. The r2 values for STP by each extraction method correlated with runoff DRP and BAP, respectively, were: 0.72 and 0.72 (Mehlich III), 0.75 and 0.73 (Bray-Kurtz P1), 0.72 and 0.72 (Olsen), 0.82 and 0.82 (distilled water), 0.82 and 0.82 (iron oxide paper), 0.85 and 0.82 (acidified ammonium oxalate), and 0.77 and 0.76 (P-saturation). All correlations were significant (P < 0.001), but the high r2 values of those obtained from distilled water, iron oxide paper, and acidified ammonium oxalate extractants indicate better precision for predicting DRP and BAP concentrations in runoff. Correlations of STP with DRP load (range: 43.4 to 472.8 g ha−1) and BAP load (54.2 to 542.0 g ha−1) were not useful (r2 < 0.18), possibly because runoff volumes were highly variable. Citing Literature Volume60, Issue3May-June 1996Pages 855-859 RelatedInformation
Publication Year: 1996
Publication Date: 1996-05-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 720
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