期刊
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
卷 32, 期 15-16, 页码 2325-2345出版社
TAYLOR & FRANCIS INC
DOI: 10.1081/CSS-120000376
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The widespread use of soil phosphorus (P) data, either in the context of agronomic or environmental management, requires an explicit understanding of potential errors related to soil P testing. This study compares a variety of soil P extraction methods, each performed by 9 separate laboratories on 24 soils from across the United States. Soil clay content ranged from 0 to 47% pH from 4.2 to 8.6, and Mehlich-3 P concentration from 2 to 205 mg kg(-1). Average interlaboratory coefficients of variation (CVs) ranged from 0.11 to 0.22 for solution extracts (Bray-1 P, Fe-strip P, Mehlich-3 P. and Olsen P) and from 0.11 to 0.70 for saturated paste extracts (resin capsules and resin membranes. incubated for 2, 4, and 7 days). For soil tests based upon solution extracts, Olsen P exhibited the greatest variability among laboratories (CV = 0.22), despite its reputed suitability for a wider range of soils than Bray-1 and Mehlich-3. Soil test data were highly correlated, with the lowest correlations occurring between Olsen and Bray-1 P or Olsen and Mehlich-3 P (r = 0.77 and 0.84, respectively) and the highest correlations occurring between Olsen P and Fe-strip P or Mehlich-3 and Bray-1 P (r = 0.94 for both correlations). Results indicate that some common soil test P protocols, when carefully conducted, yield data that may be reliably compared. such as in the compilation of regional and national soil databases.
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