Nutritional Stress in Dystrophic Savanna Soils of the Orinoco Basin
Biological Responses to Low Nitrogen and Phosphorus Availabilities
Danilo López-Hernández, Rosa Mary Hernández-Hernández, Ismael Hernández-Valencia and Marcia Toro
The llanos of Venezuela and Colombia have an extension of about 500,000 km2 and is the largest region of savannas located to the north of South America. These savannas have a high mean annual temperature (about 27°C) and relative high mean annual precipitation (over 900 mm), which are responsible for an active rate of chemical weathering and for the development of extensive well-weathered soils with strong P-fixing capacities. In the case of natural savannas (e.g., without a significant cattle raising activity), ...
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