ROLE OF LUPINE IN SOIL FERTILITY FORMATION
The work summarizes data on the influence of lupine in crop rotations with different saturation level in this culture and fertilizer application on the soil adsorbing complex of grey forest soils and chernozems. Lupine cultivation, especially as a green manure, improves humus quality, content and mobility degree of available nutrients, acidity and amount of exchange cations. The content of nutrients in the topsoil in gray forest soil is supported on the initial level better when the portion of lupine in crop rotation is more than 40 %, then when this portion is 20-28 %.