Abstract
The article reflects the results of studies carried out in the period from 2017 to 2019 in the dry steppe zone of the Russian Federation to assess the resistance of sunflower and the effectiveness of weed control when using oxyfluorfen before sowing and during the growing season of the crop in various doses and tank mixtures. The dynamics of weediness of sunflower crops according to the growing season of the crop and the timing of the use of herbicides and their tank mixtures has been established. The data of accounting for the increase in leaf area, as well as determining the photosynthetic potential of crops and the net productivity of photosynthesis when using herbicides before sowing and during the growing season of sunflower in different doses and tank mixtures are presented. Indicators of sunflower productivity and quality of seeds were determined for the studied schemes of herbicide application. The data obtained from the economic and energy assessment of the effectiveness of the use of oxyfluorfen on sunflower in terms of crop vegetation are analyzed.
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