Ecological and Economic Study of Wheat Winter Varieties by Different Geographical Origin

The results of research on increasing resistance of winter wheat varieties of different geographical origins to adverse weather conditions in the zone of unstable moistening in the North-Eastern Forest Steppe of Ukraine have been summarized. Rational use of agrometeorological resources made it possible to determine optimal terms of work on the elements of cultivation technology, taking into account weather conditions of the current year nd on their basis, to improve adaptive technologies for growing winter wheat varieties. This contributed to increase of yielding capacity, quality of grain and sustainability of agriculture. Such conditions were favorable for winter wheat crops of late sowing periods, the plants of which reached tillering phase on a significant part already in winter period. Yielding capacity of winter wheat by sowing dates (on average by varieties) was: September 1 – 5.72 t ha-1, September 10 – 5.54 t ha-1, September 20 – 5.41 t ha-1, October 1 – 5.45 t ha-1, October 10 – 4.87 t ha-1, October 20 – 5.11 t ha-1, November 1 – 5.06 t ha-1. Kraevyd and Pylypivka were the most productive among winter wheat varieties under conditions of 2020. Their yielding capacity varied between 6.18–6.88 t ha-1 and 5.53-6.30 t ha-1 depending on sowing dates. The highest level of profitability was provided by Kraevyd variety (120.0–131.2%) at late sowing dates (October 1 – November 1).