FORMATION OF YIELD AND QUALITY OF TUBERS OF POTATO VARIETIES DEPENDING ON HARVESTING TIME IN NORTHERN FOREST-STEPPE OF TYUMEN REGION
In this article the dynamics of the formation of early potatoes and recommended varieties with an early yield for further production testing in the northern forest-steppe of the Tyumen region are studied. Research was carried out in the western part of the forest-steppe zone of the Tyumen region on the experimental field of the Agrotechnological Institute of the State Agrarian University of the Northern Trans-Urals according to generally accepted methods. With the first and second digging up, the Charoit variety stood out in terms of yield, its yield was 15.1 and 23.9 tons/ha, respectively, which is 3.4 and 4.5 tons/ha higher than the standard Zhukovsky early variety. With the third digging, the maximum yield (31.8 tons/ha) was produced by the Northern variety. Variety Charoit and Severny contained 16.4 and 16.9% starch in tubers, standard variety - 13.2. The taste rating of the standard Zhukovsky early variety was 3.4 points, Charoit and Severny exceeded the latter by 0.7-1.2 points. The marked varieties were better than the standard in winter. Charoit and Severny varieties were economically more profitable, the level of profitability was 213 and 169 %, which is 13-57% higher than the standard variety. These classes are recommended for inclusion in the production test.