Crescimento e produção de pinhão manso sob adubação orgânica e fosfatada.

Abstract

It was conducted experiment in pots outdoors in a randomized block design with four replications, in order to test different doses of cattle manure and superphosphate, under the growth and production of jatropha plants after the first pruning. Treatments consisted of a factorial combination of 4 levels of cattle manure, corresponding to 0; 4; 6; 08 t ha-1 and 4 doses of superphosphate, corresponding to 0; 90; 135; 180 kg ha-1. The jatropha plants were irrigated in 3 day irrigation schedule using rainwater in the rainy season and the dry season, the public supply system water, the city of Campina Grande (PB). Ninety days after pruning, the growth variables were measured: plant-1 height, stem-1 diameter, number of branches plant-1, number of plant-1 leaves and 30% leaf plant-1 area. The superphosphate doses did not affect jatropha growth, while doses in the range of 5.20 to 8 t ha-1 of manure, promoted the growth of plants evaluated. With regard to joint fertilization, 180 kg superphosphate simple ha-1 with 8 tons of cattle manure ha-1 caused more branches plant-1, 135 kg of superphosphate ha1 and 8 t of cattle manure ha-1 , caused the largest stem diameter-1 and plant-1 height variable did not respond satisfactorily to the combined fertilization. However, the best results of this work, under the number of branches plant-1, stem diameter-1 and plant-1 height, were observed to use only the fertilization with manure. On production variables, the dose of manure influenced the number of bunches plant-1, production plant-1, flowering, number of fruit plant-1, number of seed plant-1 and weight seed plant-1 jatropha plant. With regard to fertilization, the levels tested positively influenced and linear production plant-1, number of seeds plant-1 and weight seed plant-1, but the associated fertilizations did not promote good results the variable maturation of fruits and for the number of fruits bunch-1, obtained the highest value in the absence of superphosphate and the dose of 6.71 kg ha-1 cattle manure.