Variabilidade espacial dos atributos físicos e químicos em um gleissolo mecânico sob três áreas no município Arari - MA

摘要: The chemical and physical attributes of soils have natural spatial variability that can be changed by management. Understanding the distribution pattern these is key issue to considered for correct soil use. This study evaluated properties an Gleysoil Melanic Alitic typical in three areas municipality Arari MA. To achievement survey were selected one hectare regular format, with used irrigated rice livestock (area A), extensive cattle ranching native vegetation B) C), where samples collected (warped undeformed) 0.0-0.20 m layer, grid 10 x m, totaling 121 per area a total 363. variables analyzed descriptive statistics geostatistics were: resistance penetration, density, porosity (total, macro microporosity), sand, silt, clay, pH (CaCl2), organic C, K, Ca , Mg, available P, S, Na, Al, H+Al (potential acidity), SB (sum bases), T (cation exchange capacity), V% (base saturation) m% (saturation aluminum). values higher variable penetration areas, being A had highest average value. present dependence all exception sand A. Total less variability. showed greater Na. B those whose