variability in Phalaris canariensis L. due to seeding date, seeding rate and nitrogen fertilizer. Can. J. Plant Sci. 92: 651Á669. Concern over the year-to-year and field-to-field variability in grain yield has consistently been expressed by annual canarygrass growers in Saskatchewan. The objectives of these studies were to understand the effects of a delayed seeding date (0, 15, 30 and 45 d), seeding rate (15, 25, 35, 45, and 55 kg ha (1 of seed) and applied N fertilizer (20, 40, 60, 80, and 100 kg N ha (1 ) on the development and yield of annual canarygrass, to improve recommendations of best management practices in annual canarygrass and to determine the impact of these factors on yield variability in annual canarygrass. To address these objectives, three single factor field experiments were conducted, at a number of sites in Saskatchewan from 1998 to 2001. Seeding date had a large effect on grain yield. Grain yield decreased as seeding was delayed by 30 and 45 d from early May. Seeding rate had a small effect on grain yield. The response curve was very shallow peaking at approximately 1310 kg ha(1 at a seeding rate of 45 kg ha (1 , with a 2.3 kg ha (1 increase in grain yield for each kg of fertilizer N in that range of rates. There was a slight increase in grain yield as the nitrogen rate increased above 40 kg ha(1 but the variation in grain yield also increased reducing the incentive for growers to use N rates above 40 kg ha (1 . Seeding date had a large effect on seed yield and could impact yield variability while seeding rate and nitrogen rate did not have a large effect on seed yield or yield variability. (20, 40, 60, 80 ou 100 kg de N par hectare) sur le de´veloppement et sur le rendement de l'alpiste roseau annuel, cela dans le but d'ame´liorer les recommandations concernant les meilleurs pratiques agronomiques pour cette culture ainsi que pour de´terminer l'impact de ces parame`tres sur la variabilite´du rendement. À cette fin, ils ont proce´de´a`trois expe´riences unifactorielles sur le terrain, a`divers endroits de la Saskatchewan, de 1998 a`2001. La date des semis influe conside´rablement sur le rendement grainier, qui diminue lorsque les semis sont reporte´s de 30 ou de 45 jours a`partir du de´but du mois de mai. La densite´de semis affecte le´ge`rement le rendement. La courbe de re´ponse pre´sente un tre`s petit pic autour de 1 310 kg par hectare, environ, a`la densite´de semis de 45 kg par hectare. La variation du rendement grainier a tendance a`s'atte´nuer quand la densite´de semis augmente. Le rendement grainier s'accroıˆt le´ge`rement avec l'application d'engrais azote´s. La courbe de re´ponse laisse entrevoir un rendement maximal de 1 215 kg par hectare lorsqu'on applique 78 kg d'engrais azote´par hectare; la majeure partie de cette hausse survient entre l'application de 20 a`40 kg de N par hectare, chaque kilo d'engrais ajoute´entraıˆnant une hausse de 2,3 kg par hectare du rendement grainier, dans cette fourchette. Le rendement grainier augmente le´ge`rement lorsque le taux d'applica...

. 2013. Does the presence of the gene for glabrous hull in annual canarygrass affect the response to chloride fertilizer? Can. J. Plant Sci. 93: 109Á118. Annual canarygrass is an important cereal crop in western Canada with a unique niche market as feed for caged birds. Chloride (Cl) fertilizer has been shown to increase seed yield in annual canarygrass; however, the response was only tested in one glabrous cultivar. Currently, glabrous cultivars created through mutagenesis, are lower yielding than cultivars with trichomes on their lemma, palea and glumes. The objective of this study was to determine if the mutagenic process which created cultivars that lack trichomes on their lemma, palea and glumes also affected the response of annual canarygrass to chloride fertilizer. A two-way factorial study was conducted across 7 site-years. The first factor was Cl applied at two rates (0 and 18.2 kg Cl ha(1 ) and the second factor was four cultivars (Keet, Cantate, CDC Togo (glabrous) and CDC Bastia (glabrous). The application of Cl increased the seed yield of annual canarygrass by 25% and most of this increase was due to a 21% increase in seeds per panicle. Kernel weight also contributed to increased seed yield. Chloride did not interact with the presence or absence of trichomes and therefore growers can expect to receive a yield increase from the application of Cl regardless of the annual canarygrass cultivar grown. Growers should apply 9 kg ha(1 of Cl when growing annual canarygrass. In conclusion, Cl is not involved in the physiology of the lower yield in glabrous cultivars compared with cultivars with trichomes, and Cl could not explain the seed yield differences between the two types of annual canarygrass.Key words: Canaryseed, annual canarygrass, environmental conditions, seed yield, yield stability May, W. E., Holzapfel, C. B., Lafond, G. P. et Schoenau, J. J. 2013. La pre´sence du ge`ne de la cosse glabre chez l'alpiste roseau affecte-t-elle la re´action aux engrais contenant du chlore? Can. J. Plant Sci. 93: 109Á118. L'alpiste roseau est une importante ce´re´ale annuelle dans l'ouest du Canada. Cette culture occupe un cre´neau unique, qui est celui de la nourriture pour les oiseaux en cage. On sait que les engrais a`base de chlore (Cl) accroissent le rendement grainier de l'alpiste, cependant, cette re´action n'a e´te´teste´e que sur un cultivar glabre. Or, a`l'heure actuelle, les varie´te´s glabres, qui re´sultent de la mutage´ne`se, s'ave`rent moins productifs que les cultivars pre´sentant des trichomes sur leur lemme, leur pale´ole et leurs glumelles. L'e´tude devait e´tablir si le processus de mutage´ne`se a`l'origine des cultivars sans trichomes sur le lemme, le pale´ole et les glumelles modifie aussi la re´action de l'alpiste roseau annuel aux engrais renfermant du chlore. À cette fin, les auteurs ont proce´de´a`une expe´rience bifactorielle pendant 7 anne´es-sites. Le premier facteur consistait en deux taux d'application de l'engrais Cl (0 et 18,2 kg de Cl par hectare) et le second, en quatre cultivars [...