The analysis of economic-valuable features of sunflower sorts and hybrids sort selection filds of Rostov region

The contribution of external (soil-climatic) and internal (a grade or hybrid genotype) factors in variability sunflower phenotype (the duration of the vegetative period, height of plants, weight 1000 seeds and productivity of plant) was defined by means of the statistical analysis. It is shown that soil-environmental conditions of cultivation area have most contribution to valiability of the investigated features of sorts or the hybrids