A study of the interpredation of potassium in soil test of Rio Grande do Sul

Abstract

The correlation between levels of soil potassium and production in the soils of the 1962 wheat experiments was studied in plots both with and without potassium fertilization. The soils with similar characteristics were placed in three groups or regions: Erechim, Durox and Dark Castanho. A study was also made of the correlation between production and the percentage of cation saturation, and between production and supply of potassium by the Vageler method.