## 5 Conclusions  
The purpose of the work was to evaluate the herbage and tubers of 16 JA cultivars of different maturation periods based on lab and on-farm research, taking into account their feed production potential. The plants were grown on sod-podzolic sandy loam soils rich in mobile (available) phosphorus and low in exchangeable potassium and humus content. The research was conducted under moderate-continental climatic conditions considering the cultivar features. Field experiments, records and observations were carried out in accordance with the requirements of the field experiment methodology, the Program and methodology for evaluating Jerusalem artichoke cultivars. The research was conducted in test nurseries. The growing plants passed phenological phases following no particular pattern. Observation-based findings allowed us to group 16 cultivars into cultivars of early leaf wilting (\"early cultivars\") and cultivars of late leaf wilting (\"late cultivars\"). During the growing season, cultivars of early leaf wilting underwent all phenological phases of development: shoots, budding, flowering, tuberization and wilting of the above-ground plant parts. They were 155-208 cm high. The average stem thickness value was19.9 mm at the butt end and 15.0 mm at the height of the stem cut with a mower (40 cm). The green mass yield averaged 29.7 t/ha at the beginning of September. By the third ten-day period of October, the plants had mostly withered and dried up. The highest gross yield of tubers in early September was mainly produced by the cultivars Diyeticheskiy (43.5 t/ha) and Nadezhda (40.8 t/ha). At the end of October, cultivars Nakhodka (51.1 t/ha) and Skorospelka (50.7 t/ha) did the best. To summarize, the average yield of tubers in early September was 27.6 t/ha; at the end of October--44.5 t/ha. All cultivars of late leaf wilting passed a phase of full shoots, but some cultivars did not have time to reach budding and flowering phases before the frost. They were 220-280 cm high. The stem thickness was 24.1 mm at the butt end and 19.1 mm at a height of 40 cm, that is, stems were thicker in comparison with the stems of early-leaf-wilting cultivars. The green mass yield averaged 47.5 t/ha in early September. By the third ten-day period of October, the plants had significantly increased in weight to an average of 55.8 t/ha. The average tuber yield was 13.9 t/ha in early September and 29.0 t/ha at the end of October. With a planting density of 20 thousand pcs./ha, a small lesion of leaf plates with powdery mildew was detected: in July--1.6%, in September--8.0% and in October--13.3%. At the same time, the lesion of plants was 1-10% of the leaf surface in the form of single spots on individual plants, which corresponds to 8 points. On average, the dry matter content in JA green mass was 28.8%... 29.8%, and in tubers--23.8-24.0%, respectively. According to the chemical composition, it can be noted that cellulose and sugars predominated in the green mass: 14.9-17.3%; while the sugar content was higher in tubers: 16.9-17.6%. The data obtained may be useful for farmers who want to adapt and produce Jerusalem artichoke considering the intended end-use of this valuable and essential crop. Conceptualization, A.A.M., A.S.D., T.P.K. and O.A.S. ; data curation, A.S.D. ; formal analysis, T.P.K. and O.A.S. ; investigation, A.A.M., A.S.D. and T.P.K. ; methodology, A.A.M. and T.P.K. ; project administration, A.A.M. ; resources, A.S.D. and O.A.S. ; software, T.N.F. ; supervision, A.A.M. ; validation, T.P.K. and O.A.S. ; visualization, T.N.F. ; writing--original draft, A.A.M., A.S.D. and T.P.K. ; writing--review and editing, A.A.M. and T.N.F. All authors have read and agreed to the published version of the manuscript. This research received no external funding. The study was conducted in accordance with the Declaration of Helsinki, and approved by the Institutional Review Board of Russian State Agrarian University-Moscow Timiryazev Agricultural Academy (protocol code 700 of 1 November 2021). for studies involving animals.