The article presents the results of research on improving the efficiency of photosynthetic activity of maize crops in the Forest-Steppe. The aim of the research was to establish the influence of mineral fertilizers, by-products of the predecessor as fertilizers, herbicides, plant growth stimulants, microfertilizers on the formation and functioning of the photosynthetic apparatus of corn plants. The research was carried out during 2016-2019 on dark gray wooded coarse-grained light loam soil of the Forest-Steppe with the use of field, calculation-weight and mathematical-statistical methods. Peculiarities of leaf surface area dynamics, dry matter growth, net photosynthesis productivity, photosynthetic potential of maize sowing depending on factors of intensification of growing technology are established and optimal parameters providing high crop yield are determined. It was found that maize agrocenoses can be identified as consistently highly productive by achieving the following structural and functional characteristics: leaf surface area at stages BBCH 65 and 75 - 49,98-60,31 and 41,81-47,83 thousand m2/ha, net productivity of photosynthesis - 11.28-12.03 g/m2 per day, photosynthetic sowing potential 2718.89-3196.59 thousand m2×day/ha. Such crops accumulate 21.91-26.43 t/ha of dry matter at the stage of BBCH 75, which is realized in the formation of the crop at the level of 10.18-12.10 t/ha of grain. The research results are used to optimize the technology of growing corn in the Forest-Steppe in order to increase the efficiency of production and agro-climatic resources
corn, leaf surface, photosynthetic productivity, agrocenosis, yield, growing technology