Environmental assessment potato varieties in growing according to various predecessors in the northern forest-steppe of the Tyumen region

The research objective was to study test varieties on sideral fallow and potatoes, to establish their stability on productivity and quality of tubers in the northern forest-steppe of the Tyumen Region. The object of the research was four test varieties of potatoes of domestic selection: Valentina, Luxury, Alyona, Zhukovsky early. The soil was lixivious chernozem, hard loamy on particle size distribution, medium provided with nitrogen and phosphorus, high - with potassium, reaction of soil solution was 6.7. The predecessors were sideral fallow from mustard white and potatoes. Mineral fertilizers were not introduced. Supervision and accounts were carried out by techniques of the State crops sort testing, ARRIPP, RPRC. The stability of potatoes varieties was studied by the technique of S.A. Eberhart, W.A. Russell in V.A. Zykin's statement. Fruitful data were processed by a statistical method according to B. A. Dospekhov. It was established that the test variety of Valentin on the productivity and quality of tubers on both predecessors exceeded a standard variety Zhukovsky early on 2.1-2.2 t/hectare and on starch by 2.7-2.9 %. The productivity of the standard on sideral fallow was 32.7 t/hectare, on potatoes - 17.6 t/hectare, the content of starch was 12.5 and 12.9 % respectively. Between the tubers' productivity and the content of starch in them average negative connection (r = -0.36±0.05 … 0.42±0.09), between the content of solid and starch positive close connection was established (r = 0.79±0.12 … 0.86±0.09). Strong influence on the content of solid and starch was rendered by the variety, thus the share of its contribution made 59 %; years - 24 and the predecessor - 17 %. Valentin variety on the productivity and the content of starch took the first place among the studied varieties, a standard variety Zhukovsky early on productivity, and Alyona variety according to the content of starch took the second position. On Valentin and Alyona varieties it was necessary to accelerate the reproduction of revitalized planting material and to expand the planting area in private sector and agricultural enterprises.