APPLICATION OF AGROCHEMICALS OF REGULATORY ACTION ON TANGERINE PLANTS TO OBTAIN HIGH-QUALITY PRODUCTS

The study is devoted to the influence of agrochemicals of regulatory action on the condition of plants and biochemical components in tangerine fruits. The investigations have been conducted since 2019. The change in water deficiency under stress and under the influence of agrochemicals of regulatory action has been considered. The influence of agrochemicals on tangerine fruits’ juiciness and accumulation of the main biologically active compounds characterizing their nutritional significance has been determined. The onset of water deficiency in tangerine plants does not develop immediately due to the leaves’ anatomical and morphological features (the presence of a cuticle layer and leaf blade’s curling in drought). It is shown that when applying siliplant, a decrease in water deficiency is observed, at the same time, obstactin, having a growth-stimulating effect, leads to a deterioration in the water status due to active growth processes in plants in this variant. It has been found that in the variant with obstactin, due to a higher water deficiency, the juice yield is significantly (least significant difference LSD05 = 12.4) less; in the variant with siliplant treatments, the juice yield is slightly higher than in the control (146.3 ml); when spraying with zerebra agro, the fruits’ juiciness is higher than when treated with obstactin. Treatments significantly (least significant difference LSD05 = 1.15) reduced the amount of accumulated polyphenols, which is also noted by other authors. However, there was a stimulation of vitamin C accumulation in fruits up to 52.56–56.32 mg/100 g (with 46.29 mg/100 g at the control) and vitamin R. It has also been noted that growth regulators provide a higher accumulation of sugars in tangerine fruits (up to 94.1–97.3 g/kg). The experimental data obtained in the work contribute to the development of effective ways for regulating the functional state of the plants and obtaining high-quality fruits under stress.