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^: 3036 2011 9
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^: , 2011; N 9. - . 33-36
^: 2011
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^: (60, 70, 80, 100 ./) ( , 100, 200, 300, 400 /) . 100 ./ 58-72%, - 52-94% - 1,7-2,0 . , , 35-61%, 45-86%. 300 400 /, 2,03 1,90 . 2 x /. , . , , , 0,23; 2,13; 1,23 2,1 /2 x , 60 100 ./ - 1,3-2,1 . 100 ./. NPK 400 / - 368 53,1 / . 2009 2010 . 100 ./ 200 /.

aref2 Influence of various density of standing (60, 70, 80, 100 thousand/hectare) and backgrounds a mineral food (without application of fertilizers, with application of fertilizers on an increase 10, 20, 30, 40 t/hectares and productivity of 40 t/hectares) on photosynthetic activity and efficiency of corn is studied. It is established that increase of density of standing to 100 thousand/hectare background a mineral food increases the average area of leaves by all on 58-72%, the maximum area of leaves on 52-94% and photosynthetic potential in 1.7-2.0 times. The increase in the average area of leaves from background a mineral food, in comparison with not fertilized background, has made 35-61%, the maximum area of leaves 45-86%. The maximum photosynthetic potential of crops has been generated on 4 and 5 backgrounds it has made 2.03 and 1.90 million 2 days/hectares. Net productivity of photosynthesis increased from increase of density of standing, than from strengthening of a background of a mineral food so from 1 to 5 background it increased consistently (g/m2 x days) on 0.23 more; 2.13; 1.23; 2.1 and 0.82, and from increase in density of standing with 60 to 100 thousand/hectare in 1,3-2,1 times. On all backgrounds fertilizers the greatest crop of crude and dry phytoweight provides crops of corn with density of 100 thousand/hectare. The maximum size they have reached on backgrounds NPK on an increase of 40 t/hectares and NPK on productivity of 40 t/hectares of 36.8 and 35.2 t/hectares crude and 5.31 and 6.43 t/hectares of dry phytomass. In the conditions of 2009 and 2010, at density of standing of 100 thousand/hectare has been received the programmed increase of a crop of green weight in 20 t/hectares and close to planned a crop in 40 t/hectares, the shortage has made 12%.

^TRN: 1224408
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