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Six on-farm experiments were conducted in 2013/2014 seasons, in the Central Highlands (CHLs) of Ethiopia, with the main aim of estimating optimum sulfur rate for wheat. The treatments were, 4levels of S(S 0 =0, S 1 =5, S 2 =10, and S 3 =20 kg S/ha); 2-levels of N(N 0 =0, N =N 1 =69 kg N/ha); and 2-levels of P(P 0 =0, P =P 1 =20 kg P/ha), supplied by gypsum, urea and triple super phosphate(TSP), respectively. The experimental design was RCBD, and the treatments were replicated three times. The grain and total above ground biomass (TAGB) yields, and number of