Características químicas de um neossolo quartzarênico incubado com pó de rocha granulítica

Abstract

The increasing demand for alternative sources of nutrients for agricultural crops is aimed at higher productivity, lower production costs, and greater sustainability in agriculture. Granulite rocks contain a large amount of chemical nutrients beneficial for plant growth, having the potential to increase soil fertility. Thus, the objective was to evaluate the effect of siliceous rock dust on the chemical attributes of a Quartz Neosol. The treatments consisted in the incorporation and incubation of six doses of rock powder (0.0, 10, 20.0, 40.0, 80.0 and 160 t ha-1). Each experimental unit consisted of a 2 kg polyethylene plastic bag filled with 1 kg of soil. The experimental design was entirely randomized with six treatments and four repetitions. After the incorporation of the rock powder, the soil was incubated for 40 days, and then the chemical attributes were analyzed: pH, CTC, H+Al, Al, SB, V (%), P, K, Ca, Mg. The results were submitted to variance analysis followed by regression analysis. The use of rock powder obtained from granulite rock increased the levels of pH, Ca, Mg, K, SB, CTC and V (%), while it decreased the H + Al and Al content. The use of granulite rock powder as remineralizer showed agronomic efficiency in relation to the improvement of soil chemical attributes.