Good yields of common purslane with a high fatty acid content can be obtained in a peat-based floating system

Interest in cultivating common purstane (Portulaca oleracea) as a food crop has grown since its identification as an exceptionally rich source of bioprotective substances considered essential for normal human growth, health promotion, and disease prevention. However, little is known about the suitable cultural systems, substrates, and irrigation systems for common purslane's commercial production. In this study, we examined the effects of various substrates in a floating system on common purslane's yield and fatty acid content during 2003 and 2004. We carried out three experiments using peat, vermiculite, coir, perlite, and mixtures of peat and perlite (3:1 and 1:1 v/v). In 2003, highest yields were obtained in plants grown in either peat(1806 g.m(-2)) or vermiculite (1982 g.m(-2)) and far exceeded those grown in coir (1254 g.m(-2)) or perlite (834 g.m(-2)). In 2004, plants grown in peat or 3 peat:1 perlite mixture yielded the best (2000 g.m(-2)), whereas the lowest yields were obtained in plants grown in either coir or perlite (534 and 601 g.m(-2), respectively). Plants grown in peat substrate had the highest total fatty acid content, alpha-linolenic acid, and linoleic acid, whereas the highest proportion of alpha-linolenic acid to total fatty acids was obtained in plants when grown in either coir or perlite.