THE BIOLOGY OF CANADIAN WEEDS.: 32 <i>Chenopodium album</i> L.

Bassett, I. J.; Crompton, C. W.

doi:10.4141/cjps78-161

Cited by 83 publications

(53 citation statements)

References 5 publications

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“…Physiological data used to parameterize the model for each crop and weed species were derived from the literature or independent experiments (1,2,6,7,12,13,16 1 • Springset tomatoes were transplanted at the 2-leaf stage from the greenhouse to the field in May of 1980 and 1981, also at a population of 17 000 plants ha-l. Natural weed populations dominated (> 90%) by lambsquarters and pigweed were allowed to grow for various lengths of time in each crop. In one set of treatments, weeds were allowed to grow for 0 to 63 d after planting, after which plots were kept free of weeds until harvest In another set of treatments, plots were kept free of weeds for 0 to 63 d after planting, and then weeds were allowed to grow until harvest Tomato yields and weed aboveground dry weights were measured in late August of each year.…”

Section: Methodsmentioning

confidence: 99%

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Use of Ecophysiological Models for Crop-Weed Interference: The Critical Period of Weed Interference

1992

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Abstract. The performance of a mechanistic simulation model of crop-weed competition was tested with data on the critical period of weed competition in sugarbeets and both seeded and transplanted tomatoes. In general, there was good agreement between simulated and observed yields for different periods of weed interference in each crop. The model was then used to evaluate the influence of weed density, weed height, and weather conditions on timing of the critical period. Simulations suggested that the greater the weed density, the shorter the period of time that the crop could tolerate early-season competition, and the longer the period of time that the crop must be kept weed free to prevent yield losses. Simulations also suggested that the length of time that a crop can tolerate early-season weed competition is related more to the availability of soil moisture, or possibly essential nutrients, than to light limitations.

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Section: Methodsmentioning

confidence: 99%

“…Observations on the increase in dry matter of seeded tomatoes during the 1982 season were not available. and pigweed, are reported to be strong accumulators of nitrogen and phosphate (2,13 Effect of water stress on the. critical period.…”

Section: 75mentioning

confidence: 99%

Use of Ecophysiological Models for Crop-Weed Interference: The Critical Period of Weed Interference

1992

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“…Chenopodium album is an annual Chenopodiaceae and a common weed in plant communities (Bassett and Crompton 1978) and soil seedbanks (Forcella et al 1992) of many cropping systems. Peak germination (Baskin and Baskin 1977) of C. album usually occurs in early to mid-spring.…”

Section: Introductionmentioning

confidence: 99%

Germination behaviour of seeds from herbicide treated plants of Chenopodium album L.

Tanveer

Nadeem²,

Ali³

et al. 2009

An. Acad. Bras. Ciênc.

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The carry-over effect of sub-lethal herbicides was investigated on the germination of seeds collected from surviving Chenopodium album plants, which had received 1/8, 1/8 twice, 1/8 three times, 1/4, 1/2, 1/1 doses of either preemergence ioxynil or post-emergence bentazone in a previous onion (Allium cepa) crop. Seeds were also collected from surviving C. album plants, which had received 1/4, 1/2, 1/1 of either pre-emergence pendimethalin, propachlor and linuron, or 1/8, 1/8 twice, 1/8 three times, 1/4, 1/2, 1/1 of post-emergence ioxynil or linuron in a previous leek (Allium porrum) crop. Seeds of surviving plants were collected and tested for germination at temperature of 5, 10, 15, 20 and 25 • C. The effect of different temperatures on the total number of germinated seeds was significant. Germination was minimum at low temperatures (5 • C or 10 • C). Herbicides did not show any effect on germination of C. album and resulted in the same final germination percentage as seeds collected from the unsprayed control plots.

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“…Chenopodium album is ranked among the most serious weeds of several major crops throughout the world (1). Freshly harvested seeds of this species are dormant.…”

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confidence: 99%

Seed Germination in Chenopodium album L

Saini¹,

Bassi²,

Spencer³

1985

Plant Physiol.

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feasibility of using ethylene or nitrate to enhance seed germination in the field.The initial experiments reported here were done to assess whether a combination of ethylene and nitrate could induce uniformly high germination in this seed. These investigations led to the information on the influence of the endogenous and exogenous availability of nitrate on the response of seeds to hormonal treatments. MATERIALS AND METHODSChenopodium album L. seeds were collected in the fall of 1982 and 1983 from the University of Alberta Parkland Farm and kept in dry storage in airtight glass bottles at -24°C. These storage conditions did not affect the degree of dormancy over the period of experimentation.Ethylene was administered either as ethephon (2-chloroethylphosphonic acid; Union Carbide) or in the gaseous form. Seeds were exposed to gaseous ethylene by placing open Petri plates inside flow-through plexiglass chambers, connected to a continuous flow of humidified air containing known amounts of ethylene. Potassium nitrate and GA4+7 were dissolved in distilled H20. Kinetin was dissolved in 1 N HCI and diluted with distilled H20 to the HCI concentration of 0.001 N. In experiments with kinetin as a treatment, the concentration of HCI in solutions of other chemicals was also was made to 0.001 N and the pH of each solution was adjusted to 6.0 with 1% (w/v) NaOH.Seeds were imbibed in 10-cm Petri plates, each containing one layer of Whatman No. 3 filter paper and 7 ml of the relevant solution or distilled H20. Each plate contained 100 to 150 seeds in all experiments, except that the interaction between GA4+7 and nitrate was studied using 50 seeds per plate. Plates were sealed with parafilm to minimize moisture loss, and were incubated in the dark at temperatures ranging from 12 to 32 ± 0. 1°C.The seeds were considered germinated when the protrusion of the radicle was visible with the naked eye. The extent of germination was recorded after 10 d of incubation. In the experiments where the rate of germination was studied, germination counts were taken from independent sets of plates on each day. This was done to eliminate any possible effect of seed movement during counting on germination.

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THE BIOLOGY OF CANADIAN WEEDS.: 32 Chenopodium album L.

Abstract: In canada, lamb's-quarters (Chenopodium album L.) occurs

Cited by 83 publications

References 5 publications

Use of Ecophysiological Models for Crop-Weed Interference: The Critical Period of Weed Interference

Use of Ecophysiological Models for Crop-Weed Interference: The Critical Period of Weed Interference

Germination behaviour of seeds from herbicide treated plants of Chenopodium album L.

Seed Germination in Chenopodium album L

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