The study of the problem of the influence of climatic factors on the conditions of formation of productivity of agrocenoses has important ecological and national economic value as the estimation of dynamics of productivity of the main crops of Ukraine according to change of meteorological factors is especially actual in the conditions of global climate changes.The correlation dependence of the formation of the yield of potato tubers on the climatic factors of the western forest-steppe of Ukraine has been analyzed. Te features of the formation of potato yields depending on the amount of active temperatures, the amount of precipitation during the growing season of the crop and the reserves of productive moisture in the arable (0-30 cm) soil layer in the budding phase and during the harvesting of the crop have been established.

The latest technologies for growing crops, including potatoes, are based on the use of modern mathematical models that can fairly accurately identify the impact of various factors of natural and technological nature on the object of study. Yield modeling makes it possible to adjust resource consumption indicators to obtain the maximum economic effect and minimize the negative impact on the environment. It was found that the lowest weediness of potato agrocenosis (24 pcs/m2) was formed by the complex application of Hezagard (4 L ha−1) and Panthera (1 L ha−1). The lowest level of actual weeds infestation had a positive effect on the yield of tubers – 27.6 t ha−1 (+26.6% to control) and was obtained in the variant of herbicide application. The results of correlations of potato tuber yield from factors such as weediness, density and productive moisture reserves in the arable soil layer are highlighted. It was found that the highest yield of 27.6 t ha−1 (+26.6% compared to the control) was obtained in the variant with the application of herbicides Hezagard (4 L ha−1) and Panthera (1 L ha−1). According to the results of multiple regression, it was found that the coefficient of multiple correlation is R = 0.9985, and the coefficient of determination is R = 0.997, i.e., the relationship between potato yield and experimental factors is quite close.

The problem of weed control has been facing mankind since the beginning of agricultural development, and is especially relevant today. Weeds began to evolve not only under the influence of natural factors, but also human activities, especially with the introduction of herbicides, which have become the most powerful factor in the evolution of segetal vegetation. Over the past two decades for biodiversity of forests, green areas of settlements and agricultural lands. Invasive species have properties that increase their ability to suppress Aboriginal species populations and compete with them for space and resources. Threats from invasive species are one of the most important environmental problems of our time, which is especially acute in the process of globalization.