Reposição de nutrientes da biomassa de eucalipto (h13) para o sistema agrossilvipastoril

Abstract

Understanding the arboreal component in system integration associated with plant nutrition in all compartments is important for the optimization of production factors. This study aims to evaluate the nutritional tenor, content and nutrient partition in biomass (leaves and thin branches, thick branches, wood and bark) Eucalyptus urograndis (H13 clone) to 60 months in different tillage integration crop livestockforest system (ILPF). The study was conducted in URT - IAFP in New Canaan North - MT. The system consists of four different arrangements, simple arrangement (2x20 m), double (2 [3x2] x20 m), triple (3 [3x2] x20 m) and pure (homogeneous) (4x3 m). The trees had their separate compartments and quantified fresh biomass total wood, bark, branches and leaves thick + thin branches representing the content that remains in the area, without commercial purposes. The material was dried, weighed, ground, and then, it was determined the levels of macronutrients (Ca, Mg, N, P, K and S) and micronutrients (B and Zn) by chemical analysis. It was observed that the nutrients accumulate in greater quantities in the wood followed from the leaves and twigs, bark and then in a lesser amount in the thick branches compartment. FGF and shell compartments correspond to a significant fraction of nutrients remaining in the system and contribute to lower replacement in maintenance of nutrients after harvest. Since the simple lines arrangement presented higher nutritional accumulation than others. Thus, the nutritional benefits are greatest in simple configuration than in homogenous stands mainly by low intraspecific competition.