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Agricultura Técnica

versión impresa ISSN 0365-2807

Resumen

FERNANDEZ LOPEZ, Carolina; VAZQUEZ, Sara; DALURZO, Humberto C.  y  MORALES, Luis A.. Index of phosphorus availability from fertilizer in soils of Misiones, Argentina. Agric. Téc. [online]. 2001, vol.61, n.2, pp.229-234. ISSN 0365-2807.  http://dx.doi.org/10.4067/S0365-28072001000200013.

The deficiency of phosphorus (P) in tropical and subtropical soils is a problem of recognized importance, which constitutes one of the most transcendental restrictions for crop production. The present work aimed at determining the availability index of phosphorus fertilizer (F) in Alfisols, Ultisols and Oxisols of Misiones, Argentina, so that it could later be used in simulation models. This index is calculated by estimating the slope of the lineal relation between the labile phosphorus and that added as fertilizer using regression analysis. Three different sites were sampled at 0 - 10 cm depths, and the samples, after conditioning, were incubated at room temperature for 180 days and increasing doses of P were applied. The P content was determined every 30 days. The F averages for the Alfisol, Oxisol and Ultisol were 0.10; 0.19 and 0.30 respectively.

Palabras clave : phosphorus; fertilizer; tropical soils.

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