Resposta da fisiologia e produção do pinhão-manso à adubação fosfatada residual e água residuária.

Abstract

Physiology and production response of jatropha to residual phosphate fertilization and wastewater. The cultivation of jatropha (Jatropha curcas L.) needs to be improved to make it suitable for the production of raw materials in order to produce biodiesel. Conducted herself thus an experiment to study the residual effect of phosphorus fertilization levels associated with the effects of irrigation levels with wastewater physiology, production and mineral composition of jatropha pie in the second year of the production cycle. The work was carried out in protected cultivation in the University Federal of Campina Grande, having started after the first production cycle, the plants pruning it has been preserved in the three most vigorous branches to a height of 80 cm. The experiment was conducted in a randomized block in the factorial analysis scheme [5 x 4] + 1, whose factors were five of residual phosphorus levels (0, 100, 200, 300 and 400 mg kg-1 soil) four wastewater blades corresponding to the replacement of evapotranspiration of the plant (50, 75, 100 and 125% of ETc) and a control with a depth of 100% ETc irrigated with water supply and fertilized with N and K, with three replications. Irrigation was obeying a irrigation every three days; the volume of water applied to each treatment was determined by water balance. Evaluations of physiology and production during the second production cycle and, after determining the oil content was characterized chemically pie jatropha in the treatments. Phosphorus levels exerted no significant influence during the evaluation period for chlorophyll a, chlorophyll b, total chlorophyll and carotenoid full. Regarding production, the residual phosphorus fertilization influenced the number of seeds, number of fruits, dry fruit weight and weight of 100 seeds, since the irrigation levels influenced the number of clusters, number of seeds, dry fruit weight, number of fruit, fruit width, width of seed, length and weight of 100 seeds. Among the minerals evaluated in jatropha pie composition potassium, calcium and phosphorus were those with the highest levels.