EFEITO DE FERTILIZANTES FOLIARES À BASE DE COMPOSTOS NATURAIS SOBRE A SEVERIDADE DA MANCHA BACTERIANA DO TOMATEIRO

Abstract

This study aimed to evaluate the effect of foliar fertilizers on the development of tomato crop in the occurrence of conditions of bacterial spot. The study was conducted in 2015, the IF Goiano Campus Morrinhos. Two foliar fertilizers were evaluated: one containing copper complexed with amino acids (Product A = CC) and the second based on natural enzymatic compounds (Product B = SS). The formulations of these two products were applied at doses of 0.3 and 0.5 l haˉ1, and 21 DAT (days after transplanting), an increase in dosage from 0.5 to 28 DAT and 1.0 l haˉ1, respectively. These were evaluated separately, jointly and in combination with copper hydroxide (Product C = Co 1.5 kg haˉ1). These were compared to an untreated witness and the application only of copper hydroxide. Inoculation was made at 30 DAT using an isolated Xanthomonas gardneri. We followed up the severity of the disease throughout the crop cycle. At the end of the experiment were evaluated the final severity, area under the disease progress curve (AACPD), yield, maturity, soluble solids and industrial yield pulp. Treatment with CC and CC + SS provided to reduce the severity of bacterial spot and AACPD respectively. The use of both fertilizers provided increased productivity compared to other treatments. There was no difference between treatments for the other variables. Thus, it can be inferred that these fertilizers can reduce losses caused by the disease, as well as result in increased production.