QUALIDADE DA PULVERIZAÇÃO NA CULTURA DO QUIABEIRO UTILIZANDO EQUIPAMENTO COSTAL

Abstract

The phytosanitary application product is carried out using sprayers, which can be of the backpack type. The okra cultivation is normally installed in a smaller area by family farmers and the use of this application equipment has brought positive results for the farmer in the field. Knapsack sprayers can be manually, motorized or electrically operated. The okra Abelmoschus esculentus (L.) is a vegetable with great nutritional value and well accepted in the Brazilian market. The objective of this research was to verify the quality of application in okra cultivation, analyzing tip pressures, application speed, sprayer types for manual knapsack spraying. The present study was carried out at the Instituto Federal Goiano – Campus Morrinhos. To carry out the spraying, the following were used: a manual backpack sprayer from the Worker brand with a capacity of 20 liters and a motorized backpack sprayer from the Tenka brand with a capacity of 20 liters. The study was carried out to evaluate the spectrum of drops in spray mixtures in a Randomized Block Design (DBC) with a 2x4 factorial scheme, consisting of two spray pressures and four spray tips with five replications for each treatment. Simple fan-type tips were used, and for motorized equipment, the standard metal tip of motorized equipment was used and for manual equipment, MagnoJet brand tips and models Magno AD 11002, Magno AD 11004 and Magno AD 11005, being all without air induction. For pressures, the valves used in the manual knapsack sprayer were from the Jacto brand, Ecovalve model, with 30 psi and 45 psi. For application with the motorized knapsack sprayer, pressures were measured using a pressure gauge on the application lance. To collect droplet spectrum values, SpinJet water-sensitive papers (2.5 cm x 7 cm) were installed, distributed 0.6 m inside and at the height of the middle third of the plant. The data were subjected to the “F” test at 5% significance. The coefficients of variation were evaluated separately for each factor. Among the equipment evaluated, the one that showed the least change in the variables presented was the manual backpack equipment.