Avaliation of the soil preparation quality in minimum cultivation area planted with eucalypt

Abstract

Evaluations, of the quality of soil preparation in the plantation lines, were made in areas with potential risk of compaction using the penetrometer to collect data about the depth and width of the furrow. The samplings were made in three sites of production of Eucalyptus in areas of Cia Suzano de Papel e Celulose in the state of São Paulo, managed under minimum cultivation of the soil and where crop was mechanized and intensive. The statistical evaluation of the quality was made through the measurement and assessment of the results of the soil preparation, comparing the results with the technical quality standards pre-established by the company. The data were analyzed graphically and statistically. In the graphic analysis of the three sites sampled, the site 2, with soil of medium texture, presented all the stands analyzed inside the technical standards for depth and width of the furrow (30 and 60 cm respectively); in the site 3, soil with loamy texture, in the five stands analyzed, two of them didn´t achieve the minimum rate of depth and width for the furrow established by the technical standards, and in the site 1, soil with sandy texture, all the stands sampled didn´t achieve the minimum width specified by the norms, on the other hand, the depth was accomplished. The statistical analysis demonstrated a significant correlation between depth of soil preparation and plantation line, mainly in the lines of traffic and/or wood warehouse that presented the smallest depths of soil preparation. There was also significant correlation between type of soil x line of plantation x point of collection of the penetrometer in the furrow, showing that the tines of the sub soiling has greater action on the right side of the furrow and that this action is effective only when it is close to the central point. The other corresponding points don´t differ from it significantly. The method used to evaluate the quality of the soil preparation, testified to be efficient and it supplied consistent results that allowed a wide assessment of the quality of the soil preparation, classifying it in agreement with the attendance or not to the technical standard established, suggesting the possible reasons for the conformity and/or non conformity and actions to the re-establishment of the appropriate conditions.