Green mass of narrow-leaved lupine varieties as a source of soil fertility

The maintenance and restoration of soil fertility is the basis for the stability of the country’s food security. One of the most effective methods of restorative agriculture is the use of siderates, the best of which are recognized plants of the legume family. The research was conducted at Vyatka State Agrotechnological University in 2022—2023 to study the possibility of using narrow-­leaved lupine varieties of various breeding in regenerative agriculture. The soils of the experimental site are sod-medium podzolic medium loamy medium-rich in basic nutrients. The object of the study was narrow-­leaved lupine varieties: Siderat 46, Akkord, Fedorovsky and Metsenat, the comparison was carried out with pea cv. Ukaz. The plots were 4.5 m2, four replications were used, the forecrop in both years was spring crops. All the studied varieties of lupin in agro-climatic conditions of Kirov region significantly exceeded the control in terms of yield of green mass of natural moisture. The yield increase was 50…60% with a slight coefficient of variation over the years in most varieties. The analysis of the yield of green mass considering its humidity showed that only Akkoord (16.40 t/ha) and Metsenat (15.95 t/ha) significantly exceeded the control (13.55 t/ha). The main part of lupine green mass obtained during harvesting is leaves (46.9%) and stems (43.9%). The variability over the years of these values is insignificant. Crude protein content and crude ash content of narrow-leaved lupine varieties were higher by 18…37% and 28…40%, respectively, compared to the control (pea). Metsenat variety had the highest crude protein and crude ash content per area unit — 2.7 and 1.31 t/ha, respectively. Narrow-­leaved lupine varieties — Akkord, Fedorovsky and Metsenat — can be recommended for restorative agriculture in the north-east of Non-­Chernozem zone of Russia to regenerate soil fertility.