Protein quality and energy density of leek (Allium porrum L) as influenced by water and nitrogen supply and plant age at harvest

abastecimiento de agua allium ampeloprasum allium porrum amino acids approvisionnement en eau calidad proteica contenido proteico dietary fibres digestibilidad digestibility digestible energy energy value essential amino acids fibra de la dieta fibre alimentaire hortalizas leeks legume lisina lysine methionine metionina nutritive value poireau protein content protein quality proteine proteins puerro rat rata rats threonine treonina valeur nutritive valor nutritivo vegetables water supply