Responsiveness of sunflower hybrids on plant populations on leached chernozem of Krasnodar region

The responsiveness of sunflower hybrids Alians Trio, Arsenal, Legion, Fakel, Kubansky 930 on plant populations 40, 50, 60, 70 ths. plants per ha was studied in 2012-2015 on leached chernozem of Krasnodar region. The trials showed increasing of seed yield at plant population enlarging to 60 ths plants per ha and it decreases when plant population is 70 ths plants per ha for all studied hybrids. Oil content of seeds changed insignificantly at plant population from 40 to 70 ths plants per ha. Maximal oil yield (1.46 t per ha) was registered at hybrid cultivation at plant population 60 ths plants per ha. Head diameter, a number of filled seeds, and 1000 seed weight decreased in average per hybrids on 18.8, 24.6 and 13.2%, respectively, at increasing of plant population from 40 to 70 ths plants per ha for all studied sunflower hybrids.