Effect of the synthetic plant growth stimulators on growth, development and productivity of potato crops has been studied. It is established that the use of gibberellic acid, 1-naphthylacetic acid and 6-benzylaminopurine is highly effective means for regulating morphogenesis and productivity of potato. It is found that the linear dimensions of potato and weight of rаw and dry matter of the whole plant increaseonly upon applying gibberellic acid. Other growth regulators have not changed the indexes significantly. The number of leaves per plant, weight of rаw and dry matter of leaves increased under the influence of gibberellic acid and 6-benzylaminopurine, that was one of the main pre-requisites to strengthen the photosynthetic activity of plants. All growth stimulators increased the leaf area. Gibberellic acid and 1-naphthylacetic acid reasoned the thickening of the chlorenchyma and growth of columnar cells of the parenchyma. Increasein leaf area and proliferation of mesophyll resulted in the increase of the leaf index and specific surface density of the leaf. Changes of phytometric and mezo-structure indexes of leaves and increase in the amount of chlorophyll under the influence of growth regulators contributed to intensification of photosynthetic activity of the leaf apparatus, and its consequence was the increase in net photosynthetic productivity and crop yields. The use of gibberellic acid and 6-benzylaminopurine proved to be the most effective.?.
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