Avaliação Comparativa entre três sistemas de cultivo

Abstract

This study aimed to explore soil chemical fertility under three land-use types at the Experimental Farm of São Luís UEMA: an agroforestry system with cupuaçu and açaí, a eucalyptus plantation and a forest reserve, at two depths (0–10 and 10–20 cm). Soil samples were analyzed for pH, organic matter, phosphorus, potassium, calcium, magnesium, exchangeable aluminum, potential acidity, sum of bases, cation exchange capacity, base saturation and aluminum saturation. All systems showed acidic soils, with differences among land uses and depths. In the samples analyzed, the eucalyptus plantation tended to present higher pH, base saturation and CEC, with no exchangeable aluminum, suggesting more intensive chemical management. The agroforestry system displayed an intermediate condition, with relatively higher organic matter and phosphorus levels, whereas the forest reserve was more acidic and showed lower base saturation. Due to the low sampling intensity and the focus only on chemical attributes, results should be interpreted as indicative trends. Still, they provide initial insights for conservation-oriented management of Yellow Latosols and highlight the potential of agroforestry systems in humid tropical environments