northern Great Plains. Can. J. Plant Sci. 89: 1089Á1097. Organic lentil (Lens culinaris Medik.) producers must rely upon the recommended rate for conventional production of 130 plants m (2 , but this seeding rate may not be suitable, as organic and conventional production systems differ in management and inputs. The objective of this study was to determine an optimal seeding rate for organic production of lentil considering a number of factors, including yield, weed suppression, soil nitrogen and phosphorus concentrations, plant uptake of phosphorus, and economic return. A field experiment was conducted for 4 site-years at locations near Saskatoon, SK. Treatments included seeding rates of 15, 38, 94, 235 and 375 seeds m (2 . Seed yield increased with increasing seeding rate up to 1290 kg ha (1 . Weed biomass was reduced by 59% at the highest seeding rate as compared with the lowest seeding rate. Post-harvest soil phosphorus and nitrogen levels were similar between seeding rate treatments. Economic return was maximized at $952 ha(1 at the highest density of 229 plants m (2 , achieved with a seeding rate of 375 seeds m (2 . Organic farmers should increase the seeding rate of lentil to achieve a plant density of 229 plants m (2 to increase profitability and provide better weed suppression. , mais une telle densite´pourrait ne pas convenir, car les intrants et les pratiques diffe`rent pour les syste`mes de culture biologique et traditionnel. L'e´tude devait e´tablir la densite´de semis optimale pour la culture biologique de la lentille en fonction de plusieurs facteurs, notamment le rendement, le de´sherbage, la concentration d'azote et de phosphore dans le sol, l'absorption de phosphore par la plante et le rendement e´conomique. Pendant quatre anne´es-sites, les auteurs ont proce´deá`u ne expe´rience sur le terrain a`plusieurs endroits pre`s de Saskatoon (Saskatchewan). Les traitements consistaient en une densite´de semis de 15, 38, 94, 235 et 375 graines par m 2 . Le rendement grainier augmente aves la densite´de semis jusqu'aù n maximum de 1 290 kg par hectare. La densite´de semis la plus e´leve´e re´duit la biomasse des adventices de 59 % comparativement a`la densite´la plus basse. La concentration de phosphore et d'azote dans le sol apre`s la re´colte e´tait analogue, peu importe la densite´des semis. Le meilleur rendement e´conomique s'e´tablit a`952 $ par hectare, a`la plus forte densite´de peuplement, soit 229 plants par m 2 , obtenue avec une densite´de semis de 375 graines par m 2 . Ceux qui pratiquent l'agriculture biologique devraient augmenter la densite´de semis de la lentille pour obtenir un peuplement de 229 plants par m 2 en vue d'en rehausser la rentabilite´et de mieux lutter contre les mauvaises herbes.
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