DESENVOLVIMENTO DO GIRASSOL SOB DOSES DE BIOFERTILIZANTE BOVINO EM CULTIVO AGROECOLÓGICO

Abstract

Sunflower production in the Northeast is still incipient. It would be an important challenge for Piaui to produce sunflower, in quantity and quality, as it would certainly add to the State's agricultural GDP, especially with regard to the production of edible oil, extracted from achenes. The effects of a liquid bovine biofertilizer on sunflower growth and biomass under agroecological cultivation were analyzed. The experiment was carried out in DIC, with five treatments and six repetitions, totaling 30 experimental units. The four treatments with the biofertilizer were 50, 75, 100 and 125% of the optimal recommendation, and the control (without application). It was analyzed: plant height (AP), stem diameter (DC), chapter diameter (DCAP), shoot dry matter production (MSPA) and root system (MSSR). The results were subjected to analysis of variance and later regressions were performed. Despite the non-significant results, the sunflower plants that received the biofertilizer showed better performance when compared to plants that did not receive the liquid organic input; furthermore, in the variables AP and MSSR, the best results were found in plants that received the highest concentrations of biofertilizer. As for the other variables, the maximum points (concentration of biofertilizer) were between 79 and 167%, with a suggestion of toxic effect in more concentrated doses of the organic input.