The harvest productivity of winter wheat depending on sowings dates and predecessor in Sisian subregion conditions of Zangezour agricultural area, RoA

Abstract

Our studies were related to influence of both early and relatively late sowing varieties on the productivity of biologically different Russian origin varieties Nota, Tanya, Batko, and Krasnodar 99 winter wheat varieties. Productivity assessment was conducted on the background after two pre-crops - perennial feed crops and pure fallow. Sowing was carried out from August 20 to September 30 of 2020-2022 with an interval of 10 days. The marked decades are grouped into 4 sowing periods: early, middle, late and very late. The Tanya variety provided the highest yield at the middle sowing time (September 1-10 and September 10-20), and this pattern was recorded during the 3 years of the study both when sowing after perennial feed crops and pure fallow. The variety Krasnodar 99 shows a more flexible character to sowing dates. The yield of this variety was at almost the same level with middle, late, and very late sowing dates, and with both pre-crops, it was 30-35 c/ha. Low yield (27.5-30.2 c/ha) was recorded when sowing in the early stages. The Batko variety is more responsive to delays in sowing. It can be considered as a variety that grows poorly in the autumn and lags in subsequent development. This variety can be sown no later than 1st of September. The highest yield of the Nota variety was obtained with an average sowing period and the pre-crops perennial feed crops amounted to 30.5 c/ha, and after pure fallow 33.8 c/ha of grain was provided.