Crescimento e teores de nutrientes de cinco acessos de pinhão-manso (Jatropha curcas L.) cultivados no Município de Santa Terezinha - PB.

Abstract

Growth and nutrient contents of five jatropha (Jatropha curcas L.) accessions cultivated in the Municipality of Santa Terezinha - PB. This study aimed to evaluate the behavior of different accessions of jatropha, AC1 (Maturéia), AC2 (Crossing),AC3 (Minas Gerais), AC4(pollinate), AC5 (Line age dwarf). The experiment was conducted in two steps: the greenhouse and field, Tamanduá Farm Institute, Santa Terezinha, PB. The jatropha plants were grown in plastic pots with a substratecomposed of 12L sandy soil + clay soil in 1:1 ratio. During the experimental period (4 months - Experiment1) the Irrigation was daily using Hoagland nutrient solution with 40% ionic strength to the evaluation of plant height, leaf number and leaf area. After 4 months the jatropha plants were transferred to field conditions and fertilized with 50g of the formula 10-10-10, every 30days, for a period of 4 months (Experiment 2). At the end of 120 days were quantified foliar concentrations of N, P, K, Ca, Mg, S, Fe, Zn, Na and Si, for each access. The experimental design for both experiments was completely randomized with four replications. In Experiment 1 data were submitted to polynomial regression analysis and in experiment 2 were evaluated by Tukey's test, with the help of the statistical program Assistat. The accessions evaluated exbiram different behavior for each of the variables analyzed. The results of this study are suggestive of genetic variability which is also indicated by the anatomical characteristics differentiated between accesses.