Influence of plant population on yield and yield structure of maternal forms of sunflower hybrids

In 2017-2019 we studied yield formation yield structure and its quality in constant self-pollinated lines - maternal forms of the sunflower hybrids VK 101, VK 678, VK 905, VA 760 and ED 765 of VNIIMK breeding depending on plant population 40, 50, 60 and 70 thousand plants per ha. The researches were conducted on leached black soils in the central nature-climatic zone of the Krasnodar region. We determined a negative dependence between seed outcome from the oblongated hole screen with a size 2.5 х 20 mm and plant population. Maximal yield of certified seeds were obtained when cultivating maternal lines VK 101, ED 765 with plant population 50 thousand plants per ha (1.28 and 1.27 ton per ha), VK 678, VA 760 - 60 thousand plants per ha (1.47 and 1.29 ton per ha) and VK 905 - 70 thousand plants per ha (1.74 t per ha). With increasing of plant population from 40 to 70 thousand plants per ha oil content in seeds increased in VK 101 by 0.7%, VK 678 - by 2.8%, VK 905 - by 2.2%, VA 760 - by 0...