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- W2000200466 abstract "Abstract Ca++ and Mg++ dominate cation exchange in soils of temperate regions and, at soil‐solution concentrations, are ineffective in displacing K+. Thus, soil tests that strongly desorb K may misrepresent its availability to field crops. This study evaluated a range of contrasting procedures, viz., NH4OAc, Mehlich‐2 and Morgan extracts, 0.01 M CaCl2‐equilibration and associated K potential (?G) for the energy of K+ ‐ Ca++ exchange, K activity or intensity: ARe k or pK+ ‐ 0.5 p (Ca++ + Mg++), and electroultrafiltration (EUF) at 200 V, 20°C, 30 min and 400 V, 80°C, 5 min. Relationships between the methods are discussed. ?G or log 0.01 M CaCl2 each explained 36.1% variance in K requirement of sugar beet over six soil series/associations; other methods explained from 24.1% to 27.5%. Prediction by regression model based on CaCl2 (or ?G), fixation factor and %silt (i.e., K release) explained 51.3% variance. Partial K+ ‐ Ca++ exchange achieved a better balance than did other methods in K desorption from sites ..." @default.
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- W2000200466 date "1992-11-01" @default.
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- W2000200466 title "Field evaluation of soil tests for K: Quantity, intensity EUF‐K and other soil properties" @default.
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- W2000200466 doi "https://doi.org/10.1080/00103629209368740" @default.
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