Cultivo de girassol irrigado com efluente doméstico tratado e adubações orgânica e inorgânica.

Abstract

The sunflower is inserted between the plant species with the greatest potential for renewable energy production in Brazil, and its wide adaptation to different climatic conditions, makes it a very promissory culture to the Brazilian Northeast. In this work, two experiments were conducted, two cycles culture of each experiment. The treatments in two experiments were arranged in completely randomized block, the first experiment with a factorial 5 (fertilization doses) x 2 (type of water), with 5 replications, total of 50 experimental units. The second factorial experiment with 4 (doses of fertilization) x 2 (type of water) + 2 (witnesses), with 5 replications, total of 50 experimental units. In the first experiment, 5 doses of inorganic fertilizer were: 60, 80, 100, 120 and 140% of N and the second experiment, 4 doses of organic fertilizer were 7.5, 10.0, 12.5 and 15.0% of dung bovine tanned in basis weight. Were analyzed: %PG, IVE, AP, NF, DC, AF, Fitomassas, DI, DE, PA, NA, P100, NAV, NANV, TCA, TCR and CAP, where the results were submitted to analysis of variance and regression, for those who obtained significant effects. The wastewater was effective for irrigation of sunflower with inorganic fertilizers, to promote significant increases in relation to the water supply. Most variables had higher production of sunflower when used with irrigation wastewater in relation to the water supply. Regarding the average inner and outer diameter of the chapter assessed on Sunflower, in experiments with inorganic and organic fertilization results showed the superiority of wastewater compared to water supply. The sunflower plants showed better results for production variables with water supply for organic fertilization, except the number of nonviable achene variable. The dosage that achieved better results was the dung bovine at a dose of 12.5%.