Condução e seleção das brotações de cepas em uma floresta de Eucalyptus sp. com diferentes tratamentos de adubação e correção do solo

Abstract

With the intense growth in the demand for forest products and the need for greater productivity, the forestry sector is looking for production alternatives, which aim at producing more productively in a sustainable way and that are more profitable. The objective of the present study was to evaluate the initial survival of Eucalyptus sp. Regrowth, to analyze the initial growth of shoots for a period of three months after cutting, submitted to different soil fertility, treatments were T1 - control , T2 - fertilization recommended, T3 recommended liming and T4 fertilization recommended + recommended liming. The experimental design was DBC (randomized block design). The experiment also aimed to select shoots with better stem characteristics, with two and three shoots per strain, respectively, corresponding to sub-levels of the initial treatments. In this way after the sowing the objective was to evaluate the growth of the stems with application of the initial treatments, together with the cutting, by the variables dendrometric height and lap circumference, for a period of sixty days. These were evaluated by a randomized block design (3) at random (Factor 1 = number of shoots, 2 levels, Factor 2 = Fertilization, 4 levels), considering each individual as a sample unit with 6 replicates, totaling 144 samples (3x 2 x 4 x 6). Results: T12 - control with two shoots, T13 control with three shoots, T22 - recommended fertilization with two shoots, T23 - recommended fertilization with three shoots, T32 - recommended liming with two shoots, T33 - T42 - recommended fertilization + recommended liming with two shoots and T43 recommended fertilization + recommended liming with three shoots. Significant differences (p <0.05) were verified through ANOVA, using the Tukey averages test, using Rstudio software. The experiment with the genus Eucalyptus presented a high survival of the shoots, after three months of analysis, the application of fertilizer + liming (treatment 4), was the best treatment in all the initial analyzes, the performance of the crop, maintaining two shoots, presented the best means, in the post-harvesting evaluations, the T42 treatment presented the highest averages, both in the increase in height and in the increase in lap circumference, so the fertilization + liming together with the crop, can be considered advantageous practices for application of reforestation in plantations of Eucalyptus for the regrowth.