VARIABILITY OF THE CONTENT OF DRY MATTER AND PROTEIN IN THE FORAGE MASS OF THE HAIRY VETCH (VICIA VILLOSA ROTH) ACCESSIONS FROM THE VIR COLLECTION IN CONTRAST WEATHER CONDITIONS IN THE MOSCOW PROVINCE

A field test of hairy vetch accessions from the VIR collection was carried out in the Moscow province in order to establish the influence of weather conditions on the dry matter and protein content of the cutting mass and to identify accessions with the best feed characteristics. The results of a comparative analysis of 45 accessions grown in contrasting spring-summer vegetation conditions (dry in 2019 and rainy in 2020) indicated a modifying effect of environmental conditions on the relationship between the characteristics of the forage mass. On average, in 2020, the accessions were characterized by higher forage mass moisture content (by 1.7 times) and crude protein content (by 1.7%) compared to 2019. The results of the paired correlation analysis revealed the presence of an inverse relationship between the percentage of dry matter and crude protein in 2019 (r = ̵ ̵̵̵̵ 0.51) and the absence of a similar connection in 2020. A direct relationship was established between the percentage of dry matter in the forage mass and productivity per plant in 2020 (r = 0.81) and the absence of such a connection in 2019. Three accessions were identified – k- 30067 Sornopolovaya (Armenia), k-30461 (Latvia), k-30681 Burshtynskaya Mestnaya (Ukraine), exceeding the standard in crude protein content in both years of the study. It was noted that the selected accessions had a higher juiciness of the forage mass compared to the standard ‘Serpukhovskaya’ cultivar. Four accessions – k-30459 (Latvia), k-34284 Poltavskaya 25 (Ukraine), k-34407 JHAR (Hungary), k-35973 Yubileynaya (Chuvashia), were characterized by a high level of adaptability and stability of forage productivity and exceeded the standard indicators for the content of crude protein and moisture of the cutting mass in the dry year of 2019.