Produção de girassol sob adubação orgânica e diferentes lâminas de água.

Abstract

Organic fertilizers are substances that contain live microorganisms which when applied to the soil, colonize the rhizosphere of the plant or the inner and promote the growth of the same by increasing the availability (P) and supply of nutrients (N), or increasing the access to nutrients by the plant (greater root surface). Given the above, the objective was to study the culture of sunflower cultivar Catissol depending on the application of irrigation and organic fertilizers on soil and climatic conditions in the Brazilian semiarid. The research was conducted in Agroecological Experimental Station in Center of Human and Agricultural Sciences, University of Paraíba, in field conditions, in the municipality of Catolé do Rocha / PB. The experimental design was a randomized block with four replications and eight treatments in a factorial arrangement of 4 x 2, totaling 32 experimental units. The effects of four irrigation levels (50, 75, 100 and 125% of ETc) and two organic fertilizers (cow urine and Biofertilizer) on biometric variables, production and oil quality of sunflower were evaluated. The irrigation system used was located using the drip method, with daily irrigation. Statistical analyzes were performed and interpreted from the analysis of variance, the F test, and regression analysis, using the SISVAR 5.3 program. The biofertilizer promotes gains in plant height (PH), leaf number (NF) and leaf area (LA) Sunflower 'Catissol'. The increase in water depth up to a limit around 95% of Etc favored leaf number and leaf area Sunflower 'Catissol'. The increase in water depth up to the limit around 110% of ETc, favored fitomassas leaf and shoot Sunflower 'Catissol'. The increase in water depth caused linear decreases in dry weight of the root and the root / shoot sunflower 'Catissol' when applied biofertilizer. The cow urine did not increase the yield of sunflower 'Catissol' to the biofertilizer. The types of organic fertilizers and irrigation levels did not affect the production and sunflower production quality 'Catissol'.