Influência do estado nutricional de minicepas no enraizamento de miniestacas de eucalipto

摘要

The adventitious rooting of cuttings is influenced by intrinsic and extrinsic factors of the plant material. The knowledge about the way of the action of these factors upon rooting is essential for the success of the seedling production by minicuttings. Among the factors involved in rooting the mineral nutrition can be emphasized because there is a significant relation between it and rooting, but the importance of various nutrients in this process has not been completely explained yet. Thus, the objective of this work was to evaluate the linear association degree between the nutritional status of ministumps with the rooting of eucalyptus minicuttings. Data from the CENIBRA enterprise were used, and those of rooting of minicuttings and the nutrient contents found in chemical analyses of leaf tissues of the ministumps were analyzed. The data used were from a clonal minigarden grown in sand beds, with fertirrigation by dripping. With these data, analyses were performed to evaluate the existence of a linear correlation among the concentrations of macro and micronutrients in the ministumps and the rooting rate of the minicuttings. The results indicate that the mineral nutrition plays an important role on the adventitious rooting of the minicuttings produced by the ministumps, generating different responses according to the nutrient considered. The results of this study indicate that the nutritive solution used in the clonal minigarden must be specific for each clone.