EFICIÊNCIA AGRONÔMICA DO PÓ DE GRANITO COMO REMINERALIZADOR EM UM NEOSSOLO QUARTZARÊNICO

Abstract

The use of rock dust as a remineralizer for agricultural soils has become popular in recent years, creating the need of new sources available to meet growing demand. This work aimed to evaluate the agronomic efficiency of granite dust from four different origins (Bacabeira-MA; Duque de Caxias-RJ; Jaboatão do Guararapes-PE; and Santana do Paranaíba-SP) as a soil remineralizer, through experiments in a controlled environment. In the first stage, an incubation experiment was carried out with the four granite powders in soil with a sandy texture (Quartzarenic Neosol) using the factorial 4 (origins of the granite powder) x 5 (doses: 0, 5, 10, 20 and 40 t ha-1) with four replications for 60 days with subsequent analysis of the soil's chemical attributes. After this stage, the same soil was used to grow corn and beans in pot systems (5 kg) with the same soil used in the first stage with four replications. By analyzing the aerial part of the plants, collected 55 days after emergence, biomass production, the content and accumulated amounts of macronutrients (N, P, K, Ca, Mg and S) and micronutrients (B, Cu, Fe, Mn and Zn) were analyzed. The results obtained were subjected to analysis of variance, followed by regression analysis. This study demonstrated that granite powder significantly improves the chemical properties of the soil, including higher levels of phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg). It also increases soil pH and reduces aluminum toxicity. Additionally, it positively influenced the growth and nutrient absorption of maize and bean plants, leading to greater biomass production and improved nutritional status.