YIELD AND PHOTOSYNTHETHIC ACTIVITY OF CORN HYBRIDS WITH MINERAL FERTILIZERS AND GROWTH STIMULATORS APPLICATION
The article presents data of the assessment of the application effect of mineral fertilizers and growth stimulators on the photosynthetic activity of corn plants, as well as on the yields of early and middle-early hybrids of corn. Research conducted on the experimental field of the research laboratory "Korma" of the Samara State Agricultural Academy in 2015-2017. It was established that the grain yield of corn hybrids with the application of mineral fertilizers for the years 2015-2017 was 4,70 ... 7,17 t / ha., where the hybrid Gitago (FAO 200) is leading on the background 3. With the use of growth stimulators, the corn crop yield was 4,86 ... 5,86 t / ha. with the maximum index in Dolphin hybrid with application of Megamix N10. Agrophytocenosis of corn on average for 2015-2017, when applying mineral fertilizers to the phase of milky wax maturity, formed 21,27 ... 35,84 thousand m2 / ha. leaf surface with a maximum in the TK 202 hybrid on the 3 background. The largest area of leaves in variants with the use of growth stimulants is noted on hybrids Dolphin and Krasnodarsky 194 – 35,78 and 37,06 thousand m2 / ha, with the use of Aminocate. Maximum PP were observed in TK 202 hybrids and Dolphin – 1,95 and 1,92 million m2 / ha, on background 3. The maximum PP with stimulant application was 2,50 million m2 / ha. The highest NPP is observed when applying mineral fertilizers on the Falcon hybrid (FAO 180) – 10,06 g / m2 day. With the use of growth stimulators, the NPP is at the level of 6,82 ... 8,10 g / m2 day with the highest index in the Krasnodarsky 194 hybrid.