Effects of Seed Size on Yield and some of its Components in Rapeseed, Brassica Campestris L. Var. Toria<sup>1</sup>

Ahmed, S. U.; Zuberi, M. I.

doi:10.2135/cropsci1973.0011183x001300010039x

Cited by 18 publications

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“…In previous assessments of the impact of seed size on canola yield, one study reported no effect (Lamb and Johnson 2004), another reported an effect in 1 of 8 site-years (Kondra 1977), and a third reported a significant impact of seed size on yield and yield components (Ahmed and Zuberi 1973).…”

Section: Discussionmentioning

confidence: 99%

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Effect of seeding date and depth, seed size and fungicide treatment on Fusarium and Pythium seedling blight of canola

et al. 2015

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Hwang, S. F., Ahmed, H. U., Turnbull, G. D., Gossen, B. D. and Strelkov, S. E. 2015. Effect of seeding date and depth, seed size and fungicide treatment on Fusarium and Pythium seedling blight of canola. Can. J. Plant Sci. 95: 293–301. Seedling blight has a substantial impact on stand establishment and productivity of canola (Brassica napus) on the Canadian prairies. The effects of seeding date, seed size, seeding depth, and seed treatment fungicides on seedling blight of canola caused by Fusarium avenaceum and Pythium ultimum were evaluated under field conditions. In the trials inoculated with P. ultimum, early seeding reduced seedling emergence and seed yield in all 3 yr of the study. However, the interaction of F. avenaceum with seeding date was not consistent; inoculation with F. avenaceum reduced seedling emergence in early seeded canola in 1 of 4 yr, but emergence was higher in early than in mid-seeded treatments in 2 yr and there was no difference among seeding dates in 1 yr. Late seeding reduced seed yield in 2 of 4 yr in the F. avenaceum study. Seed size and seeding depth generally did not have an effect on seedling establishment or seed yield for either pathogen. Seed treatment with Helix Xtra (thiamethoxam+difenconazole+metalaxyl+fludioxonil) and Prosper FX (clothianidin+carboxin+trifloxystrobin+metalaxyl) fungicides increased seedling emergence and yield compared with the F. avenaceum-inoculated control. Seed treatment with Helix Xtra also increased seedling emergence and seed yield compared with the P. ultimum-inoculated control. Manipulation of seeding date did not substantially improve stand establishment or yield of canola when inoculum pressure was high. Seed treatment was the most effective strategy for reducing losses caused by seedling blight of canola in fields infested with F. avenaceum or P. ultimum.

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Section: Discussionmentioning

confidence: 99%

“…Seed size is an important factor affecting seedling emergence, stand establishment, and crop performance (Ahmed and Zuberi 1973;Kondra 1977;Lamb and Johnson 2004). However, no information is available on the effect of seed size on seedling emergence and canola productivity in soils infested with F. avenaceum or Pythium spp.…”

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Effect of seeding date and depth, seed size and fungicide treatment on Fusarium and Pythium seedling blight of canola

et al. 2015

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“…Within a plant, seed size may vary according to the position of the seeds within the plant or the inflorescence (Cavers & Harper 1966;Datta, Evenari & Gutterman 1970), and, particularly in legumes, according to the position of the seed within the fruit (Linck 1961;Schaal 1980). Moreover, 'carry-over' effects have been described for some species: plants originating from smaller seeds sometimes produce smaller seeds than those originating from larger seeds (Harper & Obeid 1967;Ahmed & Zuberi 1973). Seed size may thus, potentially, affect not only immediate seedling success but also the subsequent generation.…”

Section: Introductionmentioning

confidence: 99%

Seed Size Variation in Desmodium Paniculatum: I. Factors Affecting Seed Size

Wulff¹

1986

The Journal of Ecology

164

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. This content downloaded from 128.235.251.160 on Mon, SUMMARY(1) In a population of Desmodium paniculatum seed weight varies by a factor of about four. Increase in temperature during the growth of the plants, reduces nutrient and water availability, and shortening of the photoperiod decreases the mean seed weight. A 50% reduction (to mimic grazing loss) in total leaf area during seed development increases mean seed weight of plants grown at high temperatures.( 2) Seed size varies significantly among individual plants, but there is no correlation between mean seed weight per plant and total numbers of seeds produced per plant. Within a plant, seed size may vary by as much as a factor of two if grown under highnutrient supply, but this variability is significantly reduced if plants are grown with limited nutrients. Part of the within-plant variability is due to the production of fruits with a variable number of seeds and to the position of the seed within a fruit. Seedlings from different positions within the fruit have different probabilities of survival.(3) In plants grown with low (but not with high) nutrients, parental seed sizes are positively correlated with offspring seed sizes. Seed size may thus affect the subsequent generation.

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“…In another study, Kondra (1977) found that the effect of seed size on seed yield of canola was significant in one trial out of eight site-trials. In contrast, Ahmed and Zuberi (1973) reported a significant impact of seed size on yield and yield components (pods per plant and seed weight) and yield of canola. The high levels of seedling blight caused by R. solani resulted in very poor seedling emergence in all of the inoculated plots.…”

Section: Discussionmentioning

confidence: 81%

“…Seed size is known to be one of the most important factors contributing to seedling emergence, stand establishment, and crop performance (such as yield and yield components in rape seed) (Ahmed and Zuberi 1973;Kondra 1977;Lamb and Johnson 2004). To our knowledge, however, no studies have been conducted on the effect of seed size on canola seedling blight caused by R. solani.…”

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The effect of seed size, seed treatment, seeding date and depth on Rhizoctonia seedling blight of canola

et al. 2014

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2014. The effect of seed size, seed treatment, seeding date and depth on Rhizoctonia seedling blight of canola. Can. J. Plant Sci. 94: 311Á321. Rhizoctonia solani can have a substantial impact on seedling establishment and productivity of canola (Brassica napus). The effects of seeding date, seeding depth, seed size, and seed treatment on seedling blight of canola were evaluated under greenhouse and field conditions. Early seeding resulted in higher seedling emergence in one trial year and higher seed yield in all trial years relative to a late-seeded treatment. Mid-sized seed (range 0.7Á2.0 mm diam.) had greater seedling emergence in R. solani-inoculated growth medium in a greenhouse trial and higher seed yield in one of two field trials compared with smaller seed (B0.7 mm). In the greenhouse study, sowing of large seed resulted in greater plant height and shoot weight compared with sowing of smaller seed. The effect of seeding depth was significant only on shoot dry weight, which increased at a seeding depth of 2.6 cm. Seed treatment with Helix Xtra (thiamethoxam'difenconazole'metalaxyl'fludioxonil), and Prosper FX (clothianidin'carboxin' trifloxystrobin'metalaxyl) resulted in a significant increase in seedling emergence and yield compared with the inoculated control. These results indicate that fungicidal seed treatment can minimize the impact of R. solani on canola. . 2014. Incidence du calibre des graines, du traitement des semences ainsi que de la date et de la profondeur des semis sur la fonte des semis du canola par Rhizoctonia. Can. J. Plant Sci. 94: 311Á321. Rhizoctonia solani peut avoir un impact majeur sur l'implantation et le rendement du canola (Brassica napus). Les auteurs ont e´value´les effets de la date et de la profondeur des semis, du calibre des graines et du traitement des semences sur la fonte des semis du canola, en serre et au champ. L'ensemencement haˆtif a donne´lieu a`une leve´e plus importante une anne´e, lors des essais, et a de´bouche´sur un meilleur rendement grainier que celui obtenu avec un ensemencement tardif, toutes les anne´es de l'expe´rience. Les graines de calibre moyen (de 0,7 a`2,0 mm de diame`tre) ont mieux leve´dans le milieu du culture ensemence´avec R. solani lors d'un essai en serre et ont donne´un rendement grainier plus e´leve´que les graines plus petites ( B0,7 mm) a`l'occasion de deux essais au champ. Dans l'expe´rience re´alise´e en serre, les graines de gros calibre ont donne´des plants plus grands et des pousses plus lourdes que les graines plus petites. La profondeur des semis n'a eu un effet significatif que sur le poids sec des pousses, qui est plus e´leve´quand les graines sont plante´es a`2,6 cm de profondeur. Le traitement des semences avec du Helix Xtra (thiame´thoxam'difenconazole' me´talaxyl'fludioxonil) et du Prosper FX (clothianidine'carboxine'trifloxystrobine'me´talaxyl) a entraıˆne´une hausse significative du taux de leve´e et du rendement, comparativement au te´moin inocule´. Ces re´sultats indiquent que traiter les semences avec un fongicide pe...

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Effects of Seed Size on Yield and some of its Components in Rapeseed, Brassica Campestris L. Var. Toria¹

Cited by 18 publications

References 0 publications

Effect of seeding date and depth, seed size and fungicide treatment on Fusarium and Pythium seedling blight of canola

Effect of seeding date and depth, seed size and fungicide treatment on Fusarium and Pythium seedling blight of canola

Seed Size Variation in Desmodium Paniculatum: I. Factors Affecting Seed Size

The effect of seed size, seed treatment, seeding date and depth on Rhizoctonia seedling blight of canola

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Effects of Seed Size on Yield and some of its Components in Rapeseed, Brassica Campestris L. Var. Toria1

Cited by 18 publications

References 0 publications

Effect of seeding date and depth, seed size and fungicide treatment on Fusarium and Pythium seedling blight of canola

Effect of seeding date and depth, seed size and fungicide treatment on Fusarium and Pythium seedling blight of canola

Seed Size Variation in Desmodium Paniculatum: I. Factors Affecting Seed Size

The effect of seed size, seed treatment, seeding date and depth on Rhizoctonia seedling blight of canola

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Effects of Seed Size on Yield and some of its Components in Rapeseed, Brassica Campestris L. Var. Toria¹