FERTIRRIGAÇÃO DE MILHO (Zea mays L.) COM ÁGUA RESIDUÁRIA DE SUINOCULTURA E PISCICULTURA

Abstract

Fertigation with wastewater is a viable technique for the final disposal of waste, promoting the supply and recycling of nutrients for the development of plants, reducing costs with mineral fertilizers. The objective of this work was to evaluate the accumulation of dry mass and grain production by maize culture under a comparative effect between fertigation with fish and swine wastewater. The experiment was carried out in plastic vessels, arranged in the open, at the experimental station of the Federal Goiano Institute - Rio Verde Campus - GO. The soil used was classified as dystrophic Red Latosol, Cerrado phase, with a clay texture. The experimental design was in randomized blocks, analyzed in a 2 x 4 split plot scheme, with three replications. The treatments consisted of two sources of waste water (fish and pig farming) diluted in four proportions of water supply, being: recommended dose of waste water + 0, 25, 50, 75% of its volume in water supply, applied via drip subsurface, totaling 24 experimental plots. When the swine wastewater source is used, in relation to the dry matter of the aerial part of the corn, the dry matter of the straw, the dry matter of the aerial part and the distribution of dry matter of the stalk are greater. Despite the applied dilution, swine wastewater provides the highest dry mass and grain yield. The wastewater from fish farming used via the drip irrigation system, without dilution (0%) or the swine wastewater in the 75% dilution are the most appropriate to reach the highest dry mass and productivity of corn grains. Wastewater in the exercise of agriculture is an important source of nutrients for plants, favoring the development and productivity of corn through nutrient recycling