ЕFFECT OF FERTILIZERS AND GROWTH STIMULATORS ON THE CONTENT OF PHOTOSYNTHETIC PIGMENTS IN BLUEBERRY PLANTS CULTIVATED ON DEVELOPED LOW-LYING PEAT DEPOSITS

The results of a comparative study of the effect of complete mineral fertilizers and growth stimulators Nanoplant, Hydrohumate and Ecosil on the main characteristics of the pigment fond of the assimilating organs of two- and three-year (brephic and nobilous) plants of the two model varieties V. corymbosum L.− Bluecrop and Northland are presented. Significant genotypic, age and intervariant differences in the character and degree of response of plants to tested agrotechnologies have been revealed. It has been shown that the sexually mature blueberry plants were characterized by a higher content of photosynthetic pigments in the leaf tissue than the juvenile ones, against the background of differences in the rates of their accumulation when fertilizers were using. Substantial shifts in the composition of the carotenoid complex were revealed on a high agrophone, due to the extremely activation of β-carotene, biosynthesis in the degradation of xanthophylls, which increased with age of plants. In juvenile plants, the integral stimulating effect of fertilizers on the formation of the fond of plastid pigments was manifested only in the Northland variety with the highest efficiency of application of N₁₆P₁₆K₁₆ and the least of the treatments with Nanoplant and at a divergence of the degree of their positive influence in 20.9 times. The effectiveness of the application of Ecosil and Hydrohumate was inferior to that of N₁₆P₁₆K₁₆, respectively, by 1.4 and 2.2 times. Bluecrop has an insignificant positive effect on the content of plastid pigment in leaves only on the background of N16P16K16 with an absolute dominance of the inhibitory effect on it of other types of fertilizers. In plants that have reached puberty, a substantial leveling of varietal differences in the degree of sensitivity of the pigments in plastids to the use of fertilizers has been established. In contrast to juvenile plants, due to the more pronounced activation of β-carotene biosynthesis in them, the combined effect in both varieties of blueberry on the fertilized agro background was extremely positive. The most significant positive changes in the rate of accumulation of photosynthetic pigments in both varieties of blueberry were provided by the addition of N₁₆P₁₆K₁₆ and Hydrohumate, while the least significant ones were processed by Nanoplant (from Bluecrop) and EcoSil (from Northland).

chlorophyll, β-carotene, xanthophylls, fertilization, growth regulators, blueberry

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