Establishing the characteristics of the autumn development of bread winter wheat plants from year to year remains an urgent issue in terms of both food and economic security of the state. Goal. To identify the peculiarities of the manifestation of biometric indicators in the genotypes of bread winter wheat on the autumn vegetation dormancy onset date in the conditions of the central Forest-Steppe of Ukraine. Methods. Field, laboratory, statistical. The results. It was established that under a favorable hydrothermal regime (2018), the level of manifestation of biometric indicators of plants was maximal, and under conditions of soil and air drought (2019) it was minimal. Shifting the sowing dates to later ones (October 15) led to their significant decrease. It was found that the dominant role in terms of influence belonged to the weather conditions of the year with part of influence occupied 26.5÷70.6 %. It was noted that the breeding line LUT 55198 had the highest biomass on average in the experiment over three years of research, on the autumn vegetation dormancy onset date it formed a phytocenosis with 1.54 pcs stem number per plant, 3 number and plant weight decreased sharply under stressful conditions, and the variation increased under the conditions when sowing on October 5, which must be taken into account in management the breeding process, estimation of source material and selection of genotypes with the specified parameters. Prospects. The peculiarities of the manifestation of biometric indicators in bread winter wheat on the autumn vegetation dormancy onset date and the interaction of factors were established, they significantly depended on growing conditions, sowing dates, genotype and directly influenced the growth and development of plants, programming the level of their productivity in the future in the conditions of the central Forest-Steppe of Ukraine. The breeding n line LUT 55198 and the varieties MIP Dniprianka, MIP Lada were singled out, which on the autumn vegetation dormancy onset date stably prevailed over the standard variety Podolianka in the most biometric indicators
bread winter wheat, biometric indicators, variability, genotype, sowing date, year conditions
[1] Netis, I.T. (2011). Winter wheat in the south of Ukraine. Kharkiv: Oldiplus.
[2] Krivenko, A.I., Pochkolina, S.V., & Bezede, N.G. (2019). Productivity and quality of grain of promising varieties of winter wheat at different sowing periods in the conditions of the Southern Steppe of Ukraine. Taurida Scientific Herald, 107, 78-85. doi: 10.32851/2226-0099.2019.107.10.
[3] Gyrka, A.D., Pedash, O.O., Kulyk, I.O., Viniukov, O.O., & Ischenko, V.A. (2017). Productivity of winter wheats after winter rape regards sowing time and seeding rate in Ukrainian Step conditions. Ukrainian Journal of Ecology, 7(1), 30-36.
[4] Tkachuk, V., Storozhuk, V., & Tymoshchuk, T. (2017). Weeding and winter wheat agrophytocenosis productivity depending on sowing time and seeding rate. Bulletin of Zhytomyr National Agroecological University, 1(1), 58-62.
[5] Ulich, O.L. (2014). Effect of sowing time on the realization of productivity potential of modern varieties of soft winter wheat in the context of climate change. Plant Varieties Studing and Protection, 4, 58-62.
[6] Ermantraut, E.R., Hoptsii, T.I., Kalenska, S.M., Kryvoruchenko, R.V., Turchynova, N.P., & Prysiazhniuk, O.I. (2014). Methods of selection experiment (in crop production). Kharkiv: N.p.
[7] Selyaninov, G.T. (1937). Methods of agricultural characteristics of climate. In Goltsberg, I.A., & Sapozhnikova, S.A. (Eds.), World agroclimatic reference book (pp. 5-29). Leningrad, Moscow: Gidrometeoizdat.
[8] Adamenko, T. (2020). Climatic features of autumn and preparation of winter crops for overwintering. Agronom Magazine, 4, 10-11.
[9] Mostipan, M.I. (2016). Amendments to the technology. The Ukrainian Farmer, 11, 62-66.
[10] Tkachuk, V., & Tymoshchuk, T. (2020). Influence of terms of sowing on the productivity of winter wheat. Bulletin of Agricultural Science, 3, 38-44.
[11] Mostipan, M.I. (2019). The response of winter wheat on the time of stunting autumn vegetation in the Northern Steppe of Ukraine. Scientific Progress & Innovations, 1, 116-126.
[12] Gamayunova, V.V., & Panfilova, A.V. (2018). Height and grain yield of varieties winter wheat under the influence of optimization nutrition in the Southern Steppe of Ukraine. The Bulletin of Kharkiv National Agrarian University. Series “Crop production, selection and seed production, fruit and vegetable growing and storage”, 2, 6-13.