The objective ofthis study was to evaluate grass responses to combined rates of nitrogen andcalcium. Measured response variables included leaf number, tiller number, leafarea, and DM yield. Tanzaniagrass was grown in nutrient solution with groundquartz as substrate, in a greenhouse experiment. The experiment was carriedout in randomized block design, with four replications. A fractionated 52factorial was used, with combinations of five nitrogen rates (2, 9, 16, 23,and 30 mmol L-1) and five calcium rates (0.50, 1.75, 3.00, 4.25,and 5.50 mmol L-1). Three harvests were performed, the first one39 days after seedlings transplanting, the second one 30 days after the firstharvest, and the third one 28 days after the second harvest. Calcium rates didnot interact with the nitrogen rates for the productive variables in the firstgrowth of this grass. The number of tillers and leaves depended only on nitrogenrates. Combination of nitrogen and calcium rates was necessary for tanzaniagrassleaf area at the third growth, and for the shoot biomass at the second and thirdgrowths. Maximum productive responses of this forage were reached with the minimumsupply of nitrogen of 23 mmol L-1. The use of calcium at rate notinferior to 2 mmol L-1 did not reduce productive variables of thisgrass, even with the supply of high nitrogen rate.
