THE EFFECT OF PLANTING DENSITY ON PHOTOSYNTHETIC ACTIVITY OF PLANTS OF CORN HYBRIDS OF DIFFERENT RIPENESS GROUPS
In article was studied the photosynthetic activity of plants of different hybrids of maize with different density. The results indicate that increasing plant density leads to a significant increase in leaf area of crops and photosynthetic capacity. The hybrid 301 MB RICK the leaf area increased by 17,1 while increasing the density from 50 to 70 thousand/ha, the Caucasus 412 ST. the difference was 21,9 at KOS 600 DIA of 23,5 % difference, respectively. The same pattern and in determining photosynthetic capacity. With increasing density, this indicator increased from RICK 301 MB from 1,96 million м2дн/ha to 2,42; from the Caucasus 412 SV difference was 0,72; from KOS 600 DIA 0,9 million м2дн/ha. while net photosynthetic productivity ranged from 3,9 to 6,4 g/m2 day, with a decreasing trend in thickened crops. The grain yield of maize on the control option of the experience has made: mid-season hybrid 301 MB RICK when gustato 50, 60 and 70 thousand plants/ha, respectively 48,4; 49,3; 48,5 kg/ha; medium late hybrid from the Caucasus 412 SV-51,6; 54,9; 57,1 kg/ha and in late-maturing hybrid KOS 600 ASV-60,1; 58,9; 55,6 kg/ha. The mathematical processing of the harvest data showed that in the control variant on the hybrid 301 MB RICK significant difference between the indicators at different plant density was not observed. On the hybrid the Caucasus 412 SV at the density of 60 thousand plants/ha for plants are created more favorable conditions for growth and development, as evidenced by the harvest data. The hybrid CBS 600 ASV is not always a marked difference between plant density of 50 and 60 thousand plants/ha, despite the fact that the absolute values of grain yield in the first case were slightly higher than in the second.