The objective of this work was to evaluate the dry matter production and nutrient uptake by Panicum maximum Jacq. cv. Tanzânia fertilized with acid whey. Soil samples of an Alfisol were collected in 0-20 cm, 20-40 cm and 40-60 cm layers and were used to fill PVC columns with three rings with 20 cm height, obeying the collecting depth. The doses of whey were based on its K content and 0, 75, 150, 225 and 300 kg/ha K2O were added in each application: the first one applied before sowing, the second after the first cut and the third after the second cut. The experiment was carried out in a greenhouse in a completely randomized design during 112 days. After this period, the rings of the columns were separated and soil samples were taken for analysis. The dry matter production increased with whey application and the total maximum theoretical production was obtained with the cumulative application of 390 m³/ha. The K, P, and Ca uptake by the grass and soil K increased with whey application.
forage; nutrients; nitrogen; potassium; organic wastes
