Abstract:

The paper aims at exploring the effect of density increasing on corn yield and lodging resistance under different nitrogen application levels, so as to provide a basis for establishing planting density and nitrogen application amount of corn in field. With two corn varieties, two densities and three nitrogen levels, we studied the effects of different treatments on yield, lodging resistance and economic benefits. The results showed that the yield, stem diameter and bending resistance of ‘Beiqing 340’ were higher than those of ‘Denghai 605’. Under the condition of high density, the yield of ‘Denghai 605’ was significantly reduced by applying excessive nitrogen fertilizer. The dry matter of each growth stage was N₁₈₀ > N₃₆₀ > N₀; plant height and ear height could not be used as the standard for judging lodging performance alone, and the improvement of basal internode stem bending resistance could reduce the lodging risk that increased with the crop growth. To increase the planting density would raise the economic benefits as well as the lodging risk. Under the same density, the lodging resistance was the best at N₁₈₀ level, no or excessive fertilization would both increase the lodging risk.

Key words: Maize, Lodging, Nitrogen Fertilizer, Planting Density, Yield