Green manure extracts as stimulators and inhibitors of germination of barley and oat

abonos verdes avena sativa biodegradation cereal crops cultivos de cereales engrais vert estimulantes de crecimiento vegetal extractos vegetales festuca rubra germination germination inhibitors green manures hojarasca hordeum vulgare inhibiteur de germination lolium perenne lupinus mutabilis plant extracts plant growth stimulants plant litter poa pratensis