The effect of time of use of tropical pastures on soil fertility and cattle productivity
Palabras clave:
land-use conversion, Los Tuxtlas, Mexico, pastures, soil nutrients, tropical rain forest, stocking rateResumen
Pastures in the neotropics at Los Tuxtlas, Mexico, were found to support a high density (2.8 animals ha-1 ) of cattle. The cause of this was investigated doing a topsoil (10 cm) nutrient analysis in an undisturbed forest, and a 12-yr and 32-yr old pastures resulted from deforestation. Similarly to other locations elsewhere, soil pH, total nitrogen, phosphorus, sodium, calcium, hydrogen ion, and cation exchange capacity, decreased with increasing age of the pastures, but were all high probably because of the relatively recent volcanic replenishment. The top-soil of the 12-yr and 32-yr old pastures had a nearly neutral pHH2O (7.2, 6.7), a high cation exchange capacity of 22.8 and 17.2 cmolc kg -1 , and appeared relatively rich in total nitrogen (0.365, 0.4%), extractable phosphorus (12.1, 1.12 μg g-1 ), and exchangeable cations (K + , 1.23, 0.33; Na + , 0.46, 0.31; Ca 2+ , 13.8, 7.6; Mg 2+ , 7.1, 8.1 cmol c kg-1 ). Soil bulk density increased in the older pasture to 1.0 g cm -3 . Owing to these high soil nutrients concentrations, it seems possible to support high stocking rates of cattle even in relatively old pastures.
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Derechos de autor 2003 José Luis Martínez-Sánchez, Silvia Sánchez-Beltrán (Author)
Esta obra está bajo una licencia internacional Creative Commons Atribución 4.0.
