Crescimento inicial do pinhão-manso em função da irrigação com água residuária e adubação orgânica.

Abstract

Among the species that have been used to produce biodiesel, physics nut (Jatropha curcas L.) is the one that has been distinguished as an oleaginous plant with the necessary qualities to produce biodiesel. So, with the objective to create opportunities to produce biodiesel in semi arid regions trying to expand the hydric availability and the use of organic fertilizers to cultivate oleaginous, the present work propose to study the physics nut growth in its first cycle when irrigated with wastewater and supply water using increasing levels of nitrogen from castor pie (BRS Nordestina). The experimental activities were conducted from March to December 2009 in outdoor plastic recipents at the premises of the Research Program in Basic Sanitation (PROSAB) which is located in Biological Treatment Station of Sewage (EXTRABES, in Campina Grande, PB. The experimental design was in randomized block in a factorial scheme (4 x 2) with four repetitions, totaling 32 experimental units whose factors were a kind of organic fertilizer with four nitrogen levels (50, 100, 150, 200 kg N ha"1) and wastewater and supply water. The use of organic fertilizer under different levels of N did not have residual effect on growth variables, the best results were reached at 100 kg ha"1 except at 126 DAT for plant height and stem diameter. The type of irrigation water did not significantly affect plant height, however the wastewater showed better results at 42 and 84 DAT while water supply at 126 and 168 DAT. The nitrogen effect under fertilization also did not show significant for the number of leaves and leaf area in any of the evaluations during the first cycle of culture,. In relation to the influence of the type water to the number of leafs, it was observed that the wastewater influenced positively the number of leaves at 84 DAT, and any other significant effects were observed during the evaluation cycles.