Influence of new fertilizers and growth regulator on the variability of yield and grain quality and biotic resistance of spring barley varieties

In 2020–2023, the effect of foliar top dressing in the tillering phase with Amino Start organomineral fertilizer and carbamide-ammonia CAS-28, and Alfastim growth regulator in earing on yields, grain quality indicators and susceptibility to diseases of Novichok, Pamyati Rodinoi, and Rodnik Prikamye barley varieties were studied in field experience. The hydrothermal coefficient (HTC) value during the germination–full ripeness period varied by year: 2020 – 1.60, 2021 – 1.30, 2022 – 2.10, 2023 – 2.00. The high responsiveness of the varieties Rodnik Prikamye and Novichok to the use of fertilizers has been established. The use of CAS-28 provided mainly reliable yield increases (at P ≥ 0.95). This variant has the lowest yield variability in the experiment, which increases the prospects of its use in different climatic conditions. Treatment of crops with Amino Start and Alfastim preparations increased yields in both varieties both in conditions of lack of moisture (2021) and its excess (2023). With excessive moisture (2022 and 2023), Amino Start and Alfastim preparations increased the starch and fat content in Novichok grain. In the relatively favorable growing conditions of 2020, the Novichok and Rodnik Prikamye varieties had an increased starch content in all variants, while the Pamyati Rodinoi variety had an increased fat content. Agrochemicals had no significant effect on the crude protein content in the grain. With a low level of helminthosporiasis infection, agrochemicals reduced the degree of damage to plants by reticular spotting and root rot.

spring barley Hordeum vulgare L., preparations, CAS-28, Amino Start, Alfastim, protein, starch, fat, fungal diseases