THE INFLUENCE OF MODERN COMPLEX WATER-SOLUBLE FERTILIZERS WITH A STIMULATING AND PROTECTIVE EFFECT ON PHOTOSYNTHETIC PROCESSES OCCURRING IN PLANTS AND THE YIELD OF EARLY RIPE POTATO VARIETIES IN THE CONDITIONS OF THE NORTHERN CASPIAN SEA

Pleskachev Yury Nikolaevich  -  Doctor of Agricultural Sciences, Professor, Doctor of Agricultural Sciences, Professor, Federal State Budgetary Scientific Institution “Federal Research Center “Nemchinovka”, 143026, Moscow Region, Odintsovo, Novoivanovskoe, st. Agrochemists, 6, pleskachiov@yandex.ru

Androsov Pavel Anatolyevich  -  chief agronomist, MAPS LLC, Astrakhan region, Enotaevka, st. Michurina, 50, andros_747@mail.ru

The crop size of the potato, like other agricultural crops, depends on the growth of the leaf apparatus and the productivity of its work. In the complex of factors affecting the formation of the leaf surface of plants and the productivity of photosynthesis, an important role belongs to the nutrition. As studies have shown on the use of foliar feeding with complex water-soluble fertilizers with a stimulating and protective effects in crops of early potatoes, the use of modern fertilizers has a positive effect not only on increasing the leaf area, but also increases the productivity of photosynthesis and, as a result, generally increases the biological yield of early potatoes. On average, over three years of research, the maximum leaf area and the highest photosynthetic potential was observed in the Arizona variety with the use of foliar feeding with Fertigrain Foliar Plus. The highest biological yield of potatoes was also formed in the Arizona variety and varied from 46.8 tons per ha in the control variant to 53.0 tons per ha in the variant with the use of Fertigrain Foliar Plus. The Red Scarlet variety had a biological yield 22-27% less, and the Riviera variety 32-38% less than the Arizona variety, respectively.

Key words: varieties of early potatoes, foliar feeding, complex water-soluble fertilizers with stimulating and protective effects, photosynthetic potential, productivity, Northern Caspian region