CARBON AND NITROGEN FROM MICROBIAL BIOMASS AS AN ENVIRONMENTAL INDICATORS OXISOL UNDER DIFFERENT SYSTEMS MANAGEMENT, marituba FOR

Abstract

The agriculture resulting from the exploitation of monocultures without appropriate technology without technical assistance, without basic knowledge of conservation land by the producer, has contributed to environmental degradation, causing an unstable ecosystems, by inadequate soil management. In this context, agroforestry (SAF) have been recommended in the Brazilian Amazon, as an alternative land use on a sustainable basis. The objective of this study is to evaluate the attributes of microbial biomass carbon (MBC), organic carbon (OC), total N, organic matter, reason CBM / CO and C / N of Oxisol collected depth 0-0,2m under arrangements agroforestry and conventional systems involving cocoa (Theobroma cacao), peach palm (Bactris gasipaes) and alai (Euterpe oleracea) in two sampling periods (dry and rainy), and compare them with the same variables in conditions of secondary forest . The experimental design was randomized blocks, comprising two agroforestry systems (cacao and cocoa alai + + peach palm), two conventional systems (açai and peach palm), the addition of secondary forest system in four replications. The highest values for microbial biomass occurred in the rainy season, regardless of the system used. The reason Cmicrobiano / Corgânico proved to be a good indicator of changes in organic matter, and the high values found for this ratio in the rainy season, show that there is accumulation of C in the cropping systems studied. The SAF were as efficient as the secondary forest, the contribution of soil organic matter, setting themselves as viable alternatives for remediation of soil depleted by inappropriate use.