The results obtained in a 3³ factorial experiment on the applications of the three major elements for the sugar cane are presented in this paper. The fertilizer levels used were, as follows: (1) Nitrogen, applied aa ammonium sulphate at the rates of 0.90 and 180 k/ha; (2) phosphorus, applied as superphosphate at the rates of 0.80 and 160 k/ha of P2O5; and (3) Potassium, as potassium chloride at the rates of 0.100 e 200 kg/ha of K2O. All cultural operations were caried out as in commercial plantings. The results indicated that phosphorus was the element that gave the highest yield increases, improved also the sugar content of the canca. Nitrogen also increased the yield linearly, but the effects were less noticeable than those of phosphorus. The increase in yield due to potassium was lower than those of phosphorus and nitrogen.