Abstract: Four hybrids were used to study the effects of three densities on their ear characteristics and yield component factors. The results showed that ear length, grain number per ear, 100\|grain weight were gradually reduced with the increase of the density. Seed\|producing percentage was changed in different hybrids, hybrid of 1 and 4 were increased, but the bybrid of 2 was opposite, CK and hybrid of 3 did not change significantly the length of bare ear, the rate barren stalk were trend of increased, there was little effect on ear diameter, ear rows，grain depth and quality. Variance analysis showed that the differences of hybrids, density and the interaction between hybrids and density all reached significant even extremely significant levels. The yields of four hybrids were influenced by density, increasing the density was beneficial to three hybrids yield except the hybrid of NO.2. The yield of the three hybrids were higher than that of the control with the density over 75 000·hm-2, this indicated that density was a key factor to the yield of maize.

Key words: maize, density, ear charactoeristics, yield component factors, yield