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Agriscientia

versión On-line ISSN 1668-298X

Resumen

ROLLAN, A. A. del C.; BACHMEIER, O. A.; SILVA ROSSI, M. M.  y  MORENO, M. A.. Efecto de la siembra directa sobre los procesos de adsorción de fósforo en los molisoles del centro norte de la provincia de Córdoba (Argentina). Agriscientia [online]. 2017, vol.34, n.2, pp.01-11. ISSN 1668-298X.

Under the hypothesis that the stratification of soil properties under direct seeding conditions (SD) modifies P sorption parameters, the objectives of this work were: i) to estimate P sorption parameters by using Langmuir isotherms in samples of different depth, extracted from fields under continuous direct seeding; (ii) to analyze the similarities and differences between the parameters obtained; and (iii) to identify the relationship between the edaphic properties of the surface stratum and the estimated parameters. Soil samples of 0 to 5 and 0 to 20 cm were equilibrated with solutions with increasing concentrations of P. From the relationship between the adsorbed P and the concentration of P in equilibrium, the maximum adsorption capacity (Qmax) and the retention affinity constant (k) were estimated. The higher Qmax and the low k of 0 to 5 cm samples show that there is a distinct behaviour in the first centimeters of depth. In that layer the bioavailability of P and the residuality of the applied fertilizers are regulated by adsorption phenomena responding to the presence of organic colloids, which are accumulated by the stratification associated with SD.

Palabras clave : Langmuir; soil stratification; soil organic matter; Haplustolls.

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