Seed production in onions (Allium Cepa L.) with special reference to seed yield and quality (a) Influence of plant density and size of spring transplanted mother bulbs on seed yield and quality (b) Influence of different systems of seed production on seed yield and quality

agricultural economics allium cepa bulbe bulbo bulbs calidad dimension dimensions espacement espaciamiento germination greenhouses invernaderos production de semences quality repiquage saison seasons seed seed drilling seed production semence semillas semis en ligne serre spacing transplanting trasplante