The paper presents and analyzes the influence of the photosynthetic indicators on the grain yield of the common winter wheat variety „Blagodarka Odesskaia” of local origin in polyfactorial field experiments under the effect of the forerunner crops sunflower and corn for grains drilled on recommended, admissible and late planting dates at various seeding rates. Under the conditions of the agricultural year 2016-2017, the leaf area of the common winter wheat variety „Meleag” determined in the heading stage after the forerunner sunflower exceeded the control variant corn for grains by 5447 m2, thus recording a statistically significant positive increase, the limit difference (LD) being 812 m2. The differences in pigment values were not significant. Yield record and analysis confirmed the priority of the forerunner sunflower over corn for grains that provided 4579.6 kg/ha due to more favorable conditions for plant growth and development. The yield of wheat kernels after the forerunner corn for grains constituted 3161.3 kg/ha or by 1418.3 kg/ha less. The planting dates and the seeding rate did not significantly affect the yield.