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Studies have shown that leaf area of the plants treated with growth regulators significantly (LSD 05 = 2.82) exceeded the control variant. Accumulation of dry matter exceeded the control plants. We calculated leaf productivity in dwarf mandarin and found that the highest values were noted in the variant treated with obstuctin. Growth regulators contribute to a significant increase in the number of green photosynthetic pigments, and when treating with obstuctin the synthesis of carotenoids increases, which activates protective mechanisms in plants. At the same time, their viability increases, this explains the active assimilation processes. Thus, we can say that growth regulators have a positive effect on the work of the photosynthetic apparatus of dwarf mandarin plants.

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