Evaluation of narrow-leaved lupine varieties for the purposes of regenerative(restorative) agriculture

Concern for the environmental safety of the country requires introduction of modern environmentally friendly management methods. To conserve and restore the soil fertility, it is of great importance to enrich it with an additional amount of organic matter. In agriculture, it is used to fertilise the soil not only with waste products of raised cattle but also with plant organic matter. Planting siderates, which can enrich soils with plenty of useful nutrients, plays a significant role. Before planting such crops, it is important to know that not all of them can enrich the soil composition. For the agroclimatic conditions of the Kirov Region in general and for the years of 2022–2023 in particular, we accessed the possibility of using narrow-leaved lupine. This plant gave good results with the fresh green mass yield of over than 625.6 c/ha. This value significantly exceeded the popular varieties of other agricultural crops, e.g. the field pea varieties Accord, Flamingo, Oligarch, and Fedorovsky (by 28-76 %). By the air-dry green mass yield, narrow-leaved lupine exceeded Accord and Flamingo (by 28 and 40 %, respectively). The Flamingo variety became first in nitrogen collection (4.98 c/ha, or by 72 % more than the control) whereas the Accord variety – in ash collection (13.23 c/ha, or by 64 % more than the control). The varieties of narrow-leaved lupine as Accord, Flamingo, Oligarch, and Fedorovsky can be recommended for use as siderates for restoration (regeneration) of agricultural soils.