The effect of nitrogen levels applications (0; 40; 80 and 120 kg N ha-1) and planting densities (30; 50 and 70 thousand plants ha-1) was evaluated over plant and ear heights, green ear yield (grains with 70-80% of humidity), grain yield and components of grain production of Centralmex maize cultivar. The experiment was set in a factorial scheme in randomized complete blocks with five replications and carried out under dryland conditions in Mossoró, Rio Grande do Norte, Brazil. Green ears yield was evaluated by number and weight of marketable ears with husk, and number and weight of marketable ears without husk. All evaluated traits increased with increasing nitrogen levels and decreasing planting densities, except 100 grains weight which was not affected by nitrogen levels. An effect of planting densities x nitrogen levels interaction was observed over number and weight of unhusked ears, number and weight of husked ears, and number of mature ears.
Zea mays L.; green corn; nitrogen levels; plant spacing
