It was evaluatedin this work the contents of dry matter (DM), crude protein (CP), neutral detergentfiber (NDF), total digestible nutrients (TDN), calcium (Ca), phosphorus (P)and magnesium (Mg) in the aerial section of the Tanzania grass (Panicum maximum),fertilized with nitrogen and phosphorus during the summer and autumn. The experimentaldesign was complete randomized, with a 4 × 3 factorial scheme, and fourN rates (0, 100, 200, and 300 kg/ha/year), and three pentoxide diphosphorus(P2O5) rates (0, 50, and 100 kg/ha/year), with three replicates.Three cuts were made at 40 cm of the soil, every 35 days. After each cut, thefertilization was accomplished, and P2O5 was applied onlyonce on the uniformed cut and N was parceled in three times. Nitrogen ratesdid not affect contents of magnesium and they reduced contents of dry matter,calcium and phosphorus, while phosphate fertilization increased levels of phosphorus.Fertilization had a quadratic effect on the levels of crude protein, neutraldetergent fiber, and total digestible nutrients providing a forage of betterquality as doses increased, mainly nitrogen doses. In the studied edaphoclimathicconditions, it is recommend fertilization of Tanzania grass with 300 kg of N/haand 100 kg of P2O5/ha.
