Population dynamics of Apera spica-venti as influenced by cultural methods.. vol. 1

apera spica-venti biological competition control cultural crop yield cultivos de invierno cultural control cultural methods culture d'hiver date de semis dynamique des populations fecha de siembra lutte culturale malezas mauvaise herbe mode de culture population dynamics production de semences rendement des cultures rendimiento de cultivos secale cereale seed production simulation models sowing date triticum aestivum variedades varieties weeds winter crops