Potassium buffer capacity in subtropical soils with high organic matter content
Douglas Luiz Grando 
, Cauan Guerra Martins , Lucas Peranzoni Deponti , Marcos de Lima Rodrigues , Gilmar Luiz Mumbach , Djalma Eugênio Schmitt , [...]
07/Oct/2025
ABSTRACT Subtropical soils can have medium to high soil organic matter levels, which directly affects cation exchange capacity (CEC) and potassium (K) availability to plants. This generates the need to define K buffer capacity (KBC) values and K corrective rates to improve the fertilization recommendation system for these soils, ensuring high yields and reducing the likelihood of K losses in the environment. This study aimed to define KBC values and the K rates to be applied in corrective fertilization of […]
Phosphorus buffer capacity of soils with medium clay and high organic matter content
Douglas Luiz Grando , Marcos de Lima Rodrigues , Cauan Guerra Martins , Lucas Peranzoni Deponti , Djalma Eugenio Schmitt , Gilmar Luiz Mumbach , [...]
16/Jun/2025
ABSTRACT Determining soil phosphorus (P) buffer capacity (PBC) is crucial for establishing optimal P fertilizer rates in corrective fertilization practices. However, in subtropical regions, changes in soil chemical and physical properties, such as soil organic matter (SOM) accumulation and texture modifications, can significantly impact PBC values, altering soil adsorption capacity. Consequently, P rates recommended by generalized guidelines for soil correction in these regions may be insufficient to achieve the critical P level in the soil. This study aimed to define […]
