[Quality of potato tubers from alternative and traditional farms]

acide ascorbique acido ascorbico agricultura tradicional agriculture biologique agriculture traditionnelle amidon ascorbic acid contenido de materia seca dry matter content fructosa fructose glucosa glucose isoenzimas isoenzyme isoenzymes lead nitrate nitrates nitratos organic agriculture papa plomb plomo pomme de terre potasio potassium potatoes saccharose solanina solanine solanum tuberosum starch sucrosa sucrose traditional farming tubercule tubers variedades varieties