The sunflower (Helianthu annuus L.) is considered one of the four most important oilseeds in the world. The importance of sunflowers as oilseeds is growing in production since it plays a major role in the food industry. It has great water needs for cultivation, but it also tolerates short droughts well due to a well-developed root system, and has high demands for sun and heat. The research was conducted on 16 sunflower hybrids in order to examine the influence of agroecological conditions on the photosynthetic efficiency of sunflowers in field cultivation conditions and correlation with sunflower yield components. By analyzing the parameters of photosynthetic efficiency in the flowering phase of sunflower hybrids, a statistically significant difference was found between the studied hybrids for all parameters of photosynthesis except for the parameter of phototynthetic efficiency index of the energy required from exciton to reduction of the electron end acceptor on the photosystem I (PItotal). Sunflower hybrids showed different sensitivity to agroecological conditions and different genetic potential for fertility. The indicators of photosynthetic efficiency showed a significant correlation between plant height and the efficiency with which the electron can reduce the ultimate electron acceptor to the photosystem I (RE0 / ET0) (r = 0.536) and plant height and phototynthetic efficiency index of energy required electron acceptor on the photosystem I (PItotal) (r = 0.541). In addition, the number of seeds of one sunflower head showed a positive and very significant correlation with the variable fluorescence in step I (VI) (r = 0.568) and a very high significant correlation of the negative direction with the energy flow that reduces the electron end acceptors on the acceptor side of the photosystem I (r = - 0.644).