[The formation of high-yield agrocoenosis of perennial grasses in Medium and Western Siberia]

belarus besoin en eau brassica napus cultivos de invierno cultivos de primavera culture d'hiver culture de printemps economic viability feed grasses fertilisation fertilizer application inoculation irrigation microclima microclimat microclimate necesidades de agua production de semences productividad productivity rendement rendimiento riego russian federation seed production spring crops water requirements winter crops yields