Effect of Altering Plant Density on Growth Characteristics of Summer Rape

Morrison, Malcolm J.; McVetty, P. B. E.; Scarth, R.

doi:10.4141/cjps90-016

Cited by 32 publications

(31 citation statements)

References 19 publications

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“…In an agronomic performance experiment, van Deynze et al (1992) reported mean survival at maturity of 73% when the seedling recruitment density was 49 plants m (2 , whereas mean survival at maturity was only 55% when seedling recruitment was 127 plants m (2 . Other studies reported similar results (Morrison et al 1990).…”

Section: Population Dynamicssupporting

confidence: 77%

“…Thousand-seed weight ranged from 2.70 to 3.58 g with no effect of plant density on this parameter. Similar seed yield component values were reported by Morrison et al (1990) in a field study on domesticated B. napus in monoculture in Manitoba. In Saskatchewan, Kirkland and Johnson (2000) found a negative relationship between time of emergence and seed size of progeny in domesticated B. napus where the size of individual seeds decreased substantially (up to 25% smaller) when the crop was planted in mid-May compared with late-April or the previous fall.…”

Section: Historysupporting

confidence: 71%

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The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa L.

Gulden¹,

Warwick²,

Thomas³

2008

Can. J. Plant Sci.

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. 2008. The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa. Can. J. Plan Sci. 88: 951Á996. Brassica napus and B. rapa are native to Eurasia. In Canada, these species are commonly referred to as volunteer canola, while feral populations of B. rapa are referred to as birdrape. Brassica napus and B. rapa have been grown commercially for their seed oil content in western Canada since the middle of the last century and volunteer populations are common in fields. Escaped populations of both species are also found along roadways, railways and in waste areas; however, only B. rapa is known to have naturalized, self-sustaining feral populations in these habitats in eastern Canada. Despite these escaped and feral populations, B. napus and B. rapa are mainly a concern in agricultural fields where their combined relative abundance has increased over the past few decades. In the mid 1990s, herbicideresistant genotypes of B. napus were released for commercial production. Herbicide-resistance and the stacking of genes in volunteer populations conferring resistance to multiple herbicides have contributed to increased difficulties in controlling volunteer B. napus in some crops. However, yield loss resulting from volunteer populations is not well documented in Canada.Key words: Brassica napus, Brassica rapa, herbicide resistance, transgene escape, volunteer canola, weed biology Gulden, R. H., Warwick, S. I. et Thomas, A. G. 2008. La biologie des mauvaises herbes au Canada. 137. Brassica napus L. et B. rapa L. Can. J. Plant Sci. 88: 951Á996. Brassica napus et B. rapa sont des plantes originaires d'Eurasie. Au Canada, on les de´signe souvent sous l'expression « canola spontane´», tandis que les peuplements sauvages de B. rapa sont appele´s « navette ». Dans l'Ouest canadien, Brassica napus et B. rapa sont cultive´s commercialement pour l'huile que renferment leurs graines depuis le milieu du sie`cle dernier et les repousses spontane´es sont devenues monnaie courante dans les champs. On observe des peuplements des deux espe`ces le long des routes et des voies ferre´es ainsi que dans les terrains vagues, cependant on sait que seule B. rapa s'est acclimate´e pour donner des populations sauvages et stables dans les meˆmes habitats, dans l'est du pays. Malgre´cela, B. napus et B. rapa demeurent surtout pre´occupants dans les cultures, oul eur abondance relative, une fois combine´s, s'est accrue au cours des dernie`res de´cennies. Au milieu des anne´e 1990, des ge´notypes de B. napus re´sistants aux herbicides ont e´te´homologue´s pour la culture commerciale. Cette re´sistance et l'accumulation des ge`nes qui la codent dans les peuplements spontane´s ont concouru a`compliquer la lutte contre les repousses de B. napus dans certaines cultures. Quoi qu'il en soit, les pertes de rendement qui en re´sultent sont mal e´taye´es au Canada.

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Section: Population Dynamicssupporting

confidence: 77%

Section: Historysupporting

confidence: 71%

The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa L.

Gulden¹,

Warwick²,

Thomas³

2008

Can. J. Plant Sci.

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“…The maturity of rape cultivars was generally shorter at the close row spacing than at wide row spacings (30 or 45 cm). This effect can be due to the fact that the crop growth rate increased as plant density increased (Morrison et al 1990a). Significant differences were found for the cultivar × spacing between rows * normal refers to the long-term average, 65-year average interaction that were caused by the cultivars reacting to the various spacings in a different manner.…”

Section: Plant Growthmentioning

confidence: 99%

The effect of plant population densities on growth, yield and yield components of two spring rapeseed cultivars

Özer¹

2003

PLANT SOIL ENVIRON

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Rapeseed (Brassica napus L.) is an important alternate oilseed crop in eastern Anatolia, Turkey. No information on plant density for rapeseed is available in this region. Therefore a study was initiated to investigate the effects of spacings between rows and spacings within rows on the yield and agronomic characteristics of two genotypes of spring rapeseed (Tower and Lirawell) in Erzurum, eastern Anatolia, during 1994 and 1995. The effects of spacings between or within rows on the yield and yield components of Tower and Lirawell, two cultivars of Brassica napus L., were studied for 2 years in Erzurum, Turkey. Rows were spaced at 15, 30 and 45 cm. Spacings within rows were 5, 10 and 15 cm. The results of this study suggested that seed yield was significantly affected by spacings between rows but not by spacings within rows, and that rape yields were higher at the narrow (15 cm) row spacing compared to the middle (30 cm) and wider (45 cm) spacings.

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“…Inanaga and Kumura (1974), Thurling (1974), Allen and Morgan (1975), Tayo and Morgan (1975), Major (1977), Clarke and Simpson (1978), Kasa and Kondra (1986), Augustinussen (1987), Mendham et al (1990) and Morrison et al (1990).…”

mentioning

confidence: 99%

Comparative growth analysis of Brassica napus and Brassica juncea under Swedish conditions

Kjellström¹

1993

Can. J. Plant Sci.

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Effect of Altering Plant Density on Growth Characteristics of Summer Rape

Cited by 32 publications

References 19 publications

The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa L.

The Biology of Canadian Weeds. 137. Brassica napus L. and B. rapa L.

The effect of plant population densities on growth, yield and yield components of two spring rapeseed cultivars

Comparative growth analysis of Brassica napus and Brassica juncea under Swedish conditions

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