Desenvolvimento de Cordia trichotoma (Vell.) Arrab. ex Steud. em sistema silvipastoril para ovinos implantado em Dois Vizinhos - PR

Abstract

This study aimed to analyze the initial development of the Louro-pardo (Cordia trichotoma (Vell.) Ahab. Ex Steud.), Deployed at different levels of fertilization in a silvopastoral system. To this end, the consortium held Louro-pardo with pasture Panicum maximum in the Universidade Tecnológica Federal do Paraná - Campus Dois Vizinhos. Were divided 4 double lines into intervals of 10 m with spacing of 2 m x 1,5 m in these lines. The soil was prepared chisel to a depth of 30 cm. At planting, the seedlings together with was added 250 mL / plant from a hydrogel solution. In order to assess the importance of NPK fertilization on the deployed system, this was tested at four different levels (treatments): T1 (no fertilization), T2 (33-22-9), T3 (66-44-18) e T4 (99-66-27). To evaluate the study, measurements of plant height, diameter of the neck and two equidistant canopy diameters, as well as qualitative assessments of force were made as parameters of sanity, occurrence of pests or diseases, growth, overall visual appearance of the leaves and trunk , water and nutritional stress. Data were statistically analyzed by Assistat v software. 7.6 Beta. Was also noted, amounts relating to inputs, labor and machines in order to describe and quantify the costs for the implementation of the system. The results showed a mean relative growth of 374.2% for the variable diameter, height and 278.3% to 1351.1% for pantry area in the 10 months evaluated. In this period, the effect was not influenced by the fertilization rates, as tested independent of treatment, there was significant reduction in the quality of seedlings due to attack of bacteria and the coincidence with the winter period, because it is a deciduous plant. According to the study, can be recommended dose of 192 g/plant (T4) NPK (99-66-27) with Louro-pardo, because it was the one that promoted the best results for the species. The cost effective deployment of this tree species silvopastoral system, was approximately R$ 7,50/plant.