Balanço hídrico e crescimento de pinhão manso irrigado com água superficial poluída, visando a produção de óleo.

Abstract

atropha (Jatropha Curcas L.) is a plant producing oil, Euphorblaceás family, native of the Américas and is currently considered an alternative for production of biodiesel. Objective of this research was to study the possible effects of irrigation with polluted surface water with sewage at different replacement leveis of evapotranspiration, growth and production of Jatropha. The experiment was conducted in drainage lysimeters, under field condictions in facilities, of the Federal University of Campina Grande, Campina Grande campus in the Center of Tecnology and natural resources of the academic drive of Agricultural Engeneering. The statistical design was randomized blocks with four repetitions and were studied five leveis of water replacement. Nr (Nrl=0,25; Nr2=0,50; Nr3=0,75; Nr4=l,00 and Nr5=l,25, evapotranspiration, etc.) The experimental unit was composed of a plant grown in each lysimeter. Irrigation was performed according to a irrigation frequency of three days, the volume of water applied in each treatment was determined by water balances using as a base treatment Nr4. The irrigation with polluted surface favored the better growth and production of plants, offering a possible increase of income of farmers who will work with this crop. As variables of growth (plant height, numbers of leaves, number of seeds, seeds weight, water comsumption and oil content), were affected so significantly by the replacement leveis of evapotranspiration in ali periods studied. Treatments with 1,25 evapotranspiration there were higher rates of plant growth in height, production and seed weight, oil content and number of leaves. The total comsumption of water, and evapotranspiration of the crop average evapotranspiration increased, with increasing leveis of soil moisture and in accordance with the development of the plant.