The results of research about the influence of fertilizing level and plant density on the chlorophyll content in fodder beet leaves are presented. The experimental part of the work was performed in the scientific laboratories of the Department of Forage Production, Land Reclamation and Meteorology in the production unit of the National University of Life and Environmental Sciences of Ukraine "Agronomic Research Station". The territory of the research station is located in the Right-Bank

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... teppe and is a part of Bila Tserkva agro-soil district. The experimental plots were laid on typical low-humus chernozems, coarse-grained light loam in terms of mechanical composition, which are characterized by a high content of gross and mobile forms of nutrients. The climate of the region is characterized by unstable humidity and moderate temperatures. The average annual air temperature is 6-8 ° C. The annual amount of precipitation reaches 562 mm, during the growing season - 354-394 mm (63-70% of the annual norm), which fall unevenly throughout the year. Based on the studies, it was found that fertilizers application and plant density affect the synthesis of chlorophyll in the leaves of fodder beets. The absolute values of total chlorophyll content in the leaves of fodder beet hybrids were generally different. It was highest in the leaves of the hybrid Centaur Poly with an index in July - 1.25-1.56 mg on g, in August - 2.26-3.03, in September - 5.22-6.62 mg on g. Based on the conducted researches, the close correlation between the process of chlorophyll synthesis and the yield of the leaves has been established. A strong relationship between the traits was formed in all periods of the growing season. The even correlation coefficient was: in July - 0.805; August - 0.867; September - 0.858.