Patience with density and reasonable use of different plant types in maize hybrids

The appropriate density of the hybrids with different plant morphotypes and grainyield of main maize hybrids in Henan province under different conditions and in different placeshave been studied for many years.The results indicalte that all the light intensity in middle andlow part of the plant,the single leaf weight(SLW) and the photosynthetic intensity decrease re-markably with the increase of plant density and leaf area index(LAI),and that all the charactersof the sirgle plant yield becorne inferior with different magnitudes.But the seriousness is slighterfor compact type hybrids than that for spread ones.Under high yield condition,the desirabledensity is 4250 to 5000 plants per mu(666. 67m^2)for compact maize hybrids and 3300 to 3500plants for spread ones.The yield differences between the two kinds of hybrid vary with the yieldlevels.

The appropriate density of the hybrids with different plant morphotypes and grain yield of main maize hybrids in Henan province under different conditions and in different places have been studied for many years. The results indicalte that all the light intensity in middle and low part of the plant, the single leaf weight (SLW) and the photosynthetic intensity decrease remarkably with the increase of plant density and leaf area index (LAI), and that all the characters of the sirgle plant yield become inferior with different magnitudes. But the seriousness is slighter for compact type hybrids than that for spread ones. Under high yield condition, the desirable density is 4250 to 5000 plants per mu (666. 67m2) for compact maize hybrids and 3300 to 3500 plants for spread ones. The yield differences between the two kinds of hybrid vary with the yield levels.