FORTCálcio® e calcário agrícola na produção de milho após 3 anos de uso

Abstract

Corn is among the main crops produced in the world, having several purposes, especially food and energy production. One of the basic principles for improving crop productivity is to have fertile soil; for this, it is essential that the soil be analyzed and the nutrient acidity corrected in accordance with technical recommendations. Liming aims to correct the pH of the soil, neutralize toxic aluminum in the soil, in addition to making calcium and magnesium available. With the evolution of agriculture, new liming products have emerged with more benefits, including FORTCálcio®, which has a faster action on the soil and a greater infiltration capacity, eliminating the need for incorporation and adapting well to direct planting. This work aims to evaluate the performance of FORTCálcio® amendment in comparison to other agricultural limestones in corn productivity, together with the evaluation of soil chemical atributes such as pH, Ca content and Mg content. The work was carried out at the Universidade Tecnológica Federal do Paraná (UTFPR) in clayey red Oxisols. The experimental design is in randomized blocks, in plots of 12.5x5 m with 4 replications of each treatment. The treatments were: control (without liming); T1 – Calcitic Limestone; T2- FORTCálcio® with annual applications of 350 kg ha-1; T3- FORTCálcio® with applications according to soil analysis; T4 – Dolomitic Limestone. The application of lime from treatments T1, T3 and T4 was carried out in 2019, treatment T2 received an initial application in the first harvest of 200 kg ha-1 and has an annual application of a dose of 350 kg ha-1. The corn hybrid AG 1757 was used in summer sowing to carry out this work, with a density close to 75,000 plants per ha. For statistical analysis, the data were subjected to the analysis of variance F test 5% and compared to the Tukey 5% error probability test. The work demonstrated that treatments with agricultural correctives had significant superiority in corn productivity in relation to the control, however there was no variation in productivity between the different treatments with agricultural correctives, in the evaluation of the chemical attributes of the soil, the treatments FORTCalcium A and dolomitic limestone showed significant superiority for Ca+2, Mg+2 and V% contents, in relation to the other treatments, with dolomitic limestone showing better results in Mg+2 contents.