Effect of direct seeding on phosphorus adsorption processes in the Mollisols of the center-north of the province of Córdoba (Argentina)
Under the hypothesis that the stratification of soil properties under directseeding 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...
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| Autores principales: | , , , |
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| Formato: | Artículo revista |
| Lenguaje: | Español |
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Facultad de Ciencias Agropecuarias.
2017
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| Materias: | |
| Acceso en línea: | https://revistas.unc.edu.ar/index.php/agris/article/view/19036 |
| Aporte de: |
| Sumario: | Under the hypothesis that the stratification of soil properties under directseeding 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. |
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