INFLUENCE OF IRRIGATION AND FERTILIZATION WITH ORGANIC FERTILIZER AND MINERAL IN SUNFLOWER CROP

The objective of this work was to evaluate the influence of different levels of irrigation and organic and mineral fertilization on biomass accumulation and in gaseous exchanges of sunflower. The study was developed in the experimental area belonging to the Universidade Federal do Ceará, Fortaleza, Ceará, in the period from August to November 2013. The experimental design was a completely randomized in a factorial 5x3, for the five levels of irrigation (L1 - 50%, L2 - 75%, L3 - 100%, L4 - 125% and L5 - 150% of ECA), and three fertilization, F1 - Organic (using biofertilizer of aerobic fermentation), F2 - mineral (based on 100% of the recommendation of NPK) and F3 - without the addition of fertilizers (control), with five replications. The following variables were analyzed: photosynthetic rate, transpiration, stomatal conductance, internal concentration of CO2, temperature of the sheet, dry matter of leaves and root. The sunflower crop showed higher dry matter content of the leaf and root, better performance in photosynthesis, stomatal and transpiration in the blade irrigation equivalent to 150% of ECA, when fertilized with mineral and the biofertilizer. The levels of irrigation 150% of ECA evidences greater photosynthesis, transpiration and stomatal conductance in sunflower plants.