Cultivo da mamona e seu potencial fitorremediador sob adubação nitrogenada e irrigação com água residuária.

Abstract

In the last century, the rapid growth of the population contributed to a sensitive environmental imbalance, particularly caused by waste. Studies of new techniques to reuse such waste in agriculture has become a new paradigm. The reuse can replace chemical fertilizers which leads to an increase the input of nutrients to plants as well as decrease the cost of agricultural production. By this way, the objective of this thesis is to evaluate the use of compost derived from household waste and irrigation with treated domestic wastewater in the development and production of castor oil and its potential to absorb the metals like copper and zinc. In order to acheive this objective, experiments were carried out with the plants in a greenhouse belonging to the Federal University of Campina Grande, PB. The experimental layout was randomized blocks in six by two factorial arrangement with 3 replications, where the 6 doses of available nitrogen in compost solid waste (0, 60, 100, 140, 180, 220 kg. N. ha-1 ) and two types of water (drinking water and treated domestic wastewater). It was found that nitrogen rates have significantly influenced, with respect to the development, production and oil content of castor BRS Paraguaçu. However, the use of wastewater did not significantly influence the parameters evaluated. The oil content for the first dose (control) was 27.70% while the fifth dose (180 kg. N. ha-1) obtained in 51.50% oil content, which corresponds to 1.86 times higher than the oil content obtained when using compound no waste as fertilizer. The mamonas were more efficient at absorption and translocation of zinc in irrigated with treated domestic wastewater water. The organic fertilizer derived from composted urban waste water and irrigation with treated domestic wastewater, can replace chemical fertilizer in cultivation of castor BRS Paraguaçu.