As a result of the conducted field research in 2022–2024, an assessment of 8 promising potato breeding plants for cultivation in the Republic of Mari El was carried out. All samples meet the requirements for the variety in terms of the main technological parameters of tubers. Most have superficial eyes, the shape of the tuber is from rounded to rounded-oval. In terms of total yield, the numbers 1–2–20, 2–9–21 and 3–2879–2 stood out from the early-pipeline varieties, which surpassed the standard Bellarosa variety. Of the medium-early varieties, the breeding number 2–2–21 significantly exceeded the Corona standard by 3.3 t/ha. Of the medium-ripened hybrids, 2–7–21 (Betina x Bellarosa) also significantly exceeded the standard Gulf by 2.7 t/ha. The assessment of marketable yields showed that all the studied breeding numbers have a high percentage of marketability from 77.8 to 96.2.
S.A. Zamyatin (2025) studied this question.