Four experiments were carried out to study the effect of nitrogen applications to-corn at different stages of growth. These trials were planted in four consecutive years (1949 through 1952) at the Central Experiment Station, Campinas, in the "terra roxa misturada" type of soil, each experiment being set in a new location. Chilean nitrate, superphosphate, and potassium chloride were supplied to the plants at the rate of 60 kg per hectare of each, N, P2O2, and K2O. The phosphorus and potassium fertilizers were placed in the row at planting time. Nitrate of soda was applied as follows r a) all in the row at planting time ; b) 2/3 in the row and 1/3 as top-dressing at thinning time; c) 1/3 in the row and 2/3 when thinning ; d) 1/3 in the row, 1/3 when thinning, and 1/3 when tasseling started. The experiments indicated that the greater the number of times nitrogen was parceled out the better was the favorable response of the corn plants. These results are due to the lesser degree of injury caused to the germinating seed by the smaller amounts of salts placed in the row, and from the fact that parceling out the nitrogen made this easily-leachable nutrient available to the plants at times when they needed it most.