Aplicação de uma técnica alternativa de manejo físico do solo no cultivo de eucalyptus grandis W.hill (Myrtaceae)

Abstract

The aim of this study was to evaluate the process of growth of Eucalyptus grandis non-regularization when subjected to the ground. Relying on "Optical Chaos Theory" and starting from the assumption that the reforested areas by E. grandis are considerably sensitive to the initial conditions of soil preparation was applied the technique of roughening (variations relief alternating concave and convex surfaces) to cause over time emergent properties that accelerate the process of plant growth. The study area is located on the Itajai River Basin, in Brusque, SC. This was divided into four smaller portions: two treatments with irregular (IR-A and IR-B) and two others with regular treatments (R-A and R-B). The treatments consisted of irregular armhole opening, using a hydraulic backhoe, interspersed with 1 meter wide, 4 to 5 meters long and 0.5 meters deep. In regular treatments was adopted minimum tillage of the soil, where soil preparation was restricted to lines or planting holes. In the analysis of the development of E. grandis (height, diameter and breast height - DBH) was found statistical differences between the techniques of soil preparation, and the highest values in treatments irregular. In plots irregular (IR-A and IR-B) were found higher mean values of height (5.29 meters and 5.46 meters), stem diameter (45.65 mm and 45.4 mm) and DBH (4.44 cm to 4.79 cm), respectively. It is assumed that the roughness effectively functioned as auxiliary components in the internalization of matter, retaining water, sediments and nutrients, a fact that should have enhanced and accelerated the growth of E. grandis.