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- W2091574407 abstract "The extractability and slow reactions of copper (Cu) and zinc (Zn) in a weathered savanna soil under Brachiaria decumbens, Digitaria smutsii, and Stylosanthes guianensis pastures were determined in a laboratory incubation study using a sequential extraction to remove operationally defined fractions of the metals, consisting of exchangeable, organically bound, precipitate [occluded in aluminum (Al) and iron (Fe) oxides], and residual metal fractions. The soils from the pasture fields were spiked with 100 mg Cu kg–1 soil and 200 mg Zn kg–1 soil for 24 weeks. Copper and Zn extractable with 1 N potassium nitrate (KNO3) solution decreased exponentially with time but reached a steady state after 2–3 weeks. The concentrations of Cu and Zn exchangeable with potassium (K) were greater in the Digitaria smutsii field soil than Brachiaria decumbens and Stylosanthes guianensis field soils. The exchangeability of added Cu and Zn (indexed Mn+ (exch)) with time was described by a simple exponential decay equation: Mn+ (e..." @default.
- W2091574407 created "2016-06-24" @default.
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- W2091574407 date "2010-04-02" @default.
- W2091574407 modified "2023-09-23" @default.
- W2091574407 title "Extractability and Transformation of Copper and Zinc Added to Tropical Savanna Soil under Long-Term Pasture" @default.
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- W2091574407 doi "https://doi.org/10.1080/00103621003648150" @default.
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