Eficiência agronômica do pó de rocha nefelina sienito, avaliada em Latossolo Amarelo cultivado com milheto

To improve agricultural soil quality, Brazil resorts to alternatives such as the application of soluble nutrient sources, often making the country dependent on the foreign market. Nepheline syenite rock powder appears to be a promising option as a soil remineralizer. The objective of the present study was to evaluate the agronomic efficiency of nepheline syenite rock powder as a soil remineralizer. The treatments consisted of nepheline doses (200, 400, 600, 800, and 1,000 mg of K dm⁻³) of rock powder (based on potassium supply), an absolute control (without the addition of potassium sources), and a positive control (without rock powder and with fertilization in the form of KCl). The slow solubilization and residual effect in the soil of nepheline syenite rock powder, especially with regard to potassium, make it a viable alternative for use as an alternative source of agricultural fertilizer.