Laboratory and greenhouse experiments were conducted to study the relationships among phosphate (P) fractions, P soil tests, and P bioavailability of tropical soils. In both studies, soil samples were equilibrated with two levels of CaCO3 and three of P during two incubation periods. A sequential fractionation procedure was followed to extract inorganic P fractions (Pi) resin‐P, Bic‐P, NaOH‐P I and II, HCl‐P, H2SO4‐H2O2‐P. Dry matter and P uptake by maize (Zea mays L.) were evaluated in the greenhouse experiment. Results indicated that amounts of Pi varied widely according to levels of lime, P, and incubation time. Resin‐P and Bic‐P, the most abundant Pi, were highly correlated with dry matter weight and plant uptake of P regardless of incubation interval. Highly significant correlations (P < 0.01) were found for Bray P‐1 versus resin‐P and Bic‐P, Olsen‐P versus most P fractions, and Mehlich I‐P versus resin P, Bic‐P, and residual‐P, probably because of the ability of most of these chemical extractants in identifying selectively P fractions. Relationships between plant growth parameters and soil tests were also examined.
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Cajuste et al. (1994) studied this question.
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