DOSES DE REJEITO FINO DA MINERAÇÃO DE ESMERALDAS NA CULTURA DO MILHO

Abstract

Mining tailings can be an alternative conditioner and or fertilizer contributing to proper waste disposal. The objective of this work was to evaluate the performance of the corn crop at doses of waste from emerald mining and mineral fertilization. The experiment was carried out at Instituto Federal Goiano – Campus Ceres, in a greenhouse in 5 L pots. The maize cultivar used was Agroceres 7098. The experimental design was randomized blocks in a 4x2 factorial scheme, with 4 doses: 0; 266.8; 466.8 and 666.8 m-3 ha-1 of waste, and with and without mineral fertilizer recommended for the crop, with 4 replications and two pots per plot. Irrigation was done via weather through a class A mini tank installed in the greenhouse. The evaluated variables were: first ear height (AE), plant height (AP), stem diameter (DC), ear diameter (DE) and ear length (EC), number of grain rows (NFG), number of grains (NG), number of grains per row (NGPF), mass of 1000 grains (MMG) and productivity (PROD). The Dosages of tailings without mineral fertilization at planting responded linearly for the variables except for stem diameter and ear height; with fertilization, most variables did not fit models. Increasing waste dosages without base mineral fertilizer promote improvement in the response of the tested variables. For productivity and other production variables, the increase in the dose of waste with mineral fertilizer had a negative effect. The tailings studied show promise for the corn crop and should be used in systems with a low technological level and should be better studied for other crops.