The objective of this study was to evaluate the development and levels of macronutrients present in millet and sudan grass in response to fertilization of the soil with whey. The experiment was carried out under greenhouse using 8 dm³ pots, in a completely randomized design with a 2 (partitioned and total application) x 5 (doses of whey) factorial arrangement with four replications. The doses were equivalent to 0, 167, 333, 667 and 1000 m³ ha-1 of whey and were determined based on the amount of K+ in the whey. The whey was applied in total 10 days before sowing and in split doses (50% 10 days before sowing and 50% 20 days after emergence of the seedlings). Plants were harvested after 42 days and the dry weight and shoot height were determined. Plant dry mass was ground to prepare extracts for determination of the nutrients: P, Na, K, Ca and Mg. Production of dry matter in both species started to decrease from 667 m³ ha-1 of whey in total application, whereas in partitioned application the reduction in dry matter yield began from 167 m³ ha-1 in both crops.
wastewater; forage; Pennisetum glaucum; Sorghum bicolor
