Extractable phosphorus in an Entic Haplustol soil of the central semiarid area of Córdoba, Argentina. Comparison of two evaluation methods
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The aim of this work was to select the extracting solution that better characterizes the extractable phosphorus (PE) in a soil of the central area of Córdoba (Argentina). Relationships between extractable phosphorus, soil pH, organic matter, and sampling depths were also established. Soil samples were taken at depths of 0-5, 5-20, and 20-40 cm in an Entic Haplustol soil located in the E.E.A. INTA Manfredi (Córdoba, Argentina). The studied plots were under a cropping sequence and tillage practices essay. Extractable phosphorus was quantified using the Olsen method (P-Olsen) and the Bray and Kurtz N° 1 method (P-Bray). Soil pH was measured potentiometrically, and organic matter was evaluated by the Walkley & Black method. Both methods (P-Olsen and P-Bray) are suitable for evaluating PE in the Entic Haplustol soils of the central area of Córdoba. However, we recommend P-Bray for its better repeatability and analytical sensitivity. P-Bray is more sensitive to changes in pH and organic matter contents. Extractable P analyzed by both methods is highly correlated with sampling depth, and the measures are independent of the tillage system.
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