Formation of corn productivity in early ripe maize hybrids in the conditions of Middle Povolzh'e

The variety's peculiarities of growth, development and photosynthesis in early ripe hybrids of maize in the conditions of forest-steppe zone of Middle Povolzh'e were studied. The effect of different factors on productivity of maize hybrids and formation of elements of crop structure were estimated. It was shown, that hybrids of the ripeness group ФАО100-150 is characterized the stable high photosynthetic activity. The biggest adaptation capacity during investigated years was revealed in the hybrids Росс 145 MB and ЗПТК 196, their productivity was 5,3-6,1 and 5,3-6,8 t/ha, respectively.