The effect ol certain species of weeds on the grain yield of spring barley

Scragg, E. B.; McKelvie, A. D.

doi:10.1111/j.1744-7348.1976.tb00620.x

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…They noted that hemp-nettle usually emerges somewhat after the crop in the north of Scotland, makes rapid growth while the crop is tillering, but offers little competition later in the season, because of its short life cycle. However, Scragg and McKelvie (1976) reported that increasing densities of hempnettle had little effect on barley yield at normal crop density and sowing date, similar to the findings of the present study. High densities of hemp-nettle have been reported to cause yield losses of 24% in wheat, 40% in oats and 70% in alfalfa (O'Donovan and Sharma 1987; Legere and Deschenes 1991).…”

Section: Discussionsupporting

confidence: 82%

Economic thresholds for wild radish, wild oat, hemp-nettle and corn spurry in spring barley

Weaver¹,

Ivany²

1998

Can. J. Plant Sci.

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Weaver, S. E. and Ivany, J. A. 1998. Economic thresholds for wild radish, wild oat, hemp-nettle and corn spurry in spring barley. Can. J. Plant Sci. 78: 357-361. The yield response of spring barley (Hordeum vulgare L. 'Morrison') to a range of densities of wild radish (Raphanus raphanistrum L.), wild oat (Avena fatua L.), hemp-nettle (Galeopsis tetrahit L.), and corn spurry (Spergula arvensis L.) was investigated in field experiments on Prince Edward Island from 1991 through 1994. Barley yield was modelled as a function of both barley and weed density. In the absence of weed competition, barley seed yield, number of main shoots, number of heads, and thousand-kernel weight varied significantly during the 4 yr of the study. Increasing densities of wild radish and wild oat reduced the number of barley heads primarily by interfering with tillering, but wild oat also reduced barley thousand-kernel weight. Hemp-nettle and corn-spurry at densities up to 200 plants m -2 had little effect on barley yield, except in a year of low barley yield potential. Estimated economic thresholds for wild radish, wild oat, hemp-nettle and corn spurry at a barley population of 250 plants m -2 were 37, 45, 122 and 297 plants m -2 , respectively, assuming a weed-free yield of 4 t ha -1 , a crop price of $100 t -1 , and weed control costs of $30 ha -1 .

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Section: Discussionsupporting

confidence: 82%

Economic thresholds for wild radish, wild oat, hemp-nettle and corn spurry in spring barley

Weaver¹,

Ivany²

1998

Can. J. Plant Sci.

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“…The effect of high densities of the weed on yield is a function of the total biomass of the weed population (Anon, 1976). Unlike wheat and oats, little change in yield of spring barley resulted from increasing Galeopsis numbers at normal crop density and sowing date (Scragg & McKelvie, 1976). (iii) A number of Labiate weeds respond to fertilizer application, depleting the availability of nutrients to crop species.…”

Section: Competitionmentioning

confidence: 98%

Weed Characteristics of the Labiatæ, with Special Reference to Allelopathy

Lovett

Weerakoon

1983

Biological Agriculture & Horticulture

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The Labiatae is a large family of diverse morphology and habit. Almost all members contain phytochemicals, volatile oils which contribute variously to commercial value, problems of toxicity and allelopathic activity. Weed status in the Labiatae depends primarily on competition tor environmental resources and on characteristics dependent on the phytochemical content. In a number of genera, notably Salvia, allelopathic activity has been documented.

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“…Yield components such as heads/plant, grain number/head, and 1000-kernel weight are affected most commonly (10,13). Barley grain yield is reduced as wild oat density (6,13,16,22) and dura tion (5,10) increase. In Idaho, the critical duration for wild oat in spring barley is the two-node to heading stages of the weed (10).…”

Section: Introductionmentioning

confidence: 99%

Wild Oat (Avena fatua) and Spring Barley (Hordeum vulgare) Growth and Development in Monoculture and Mixed Culture

Morishita

Thill

1988

Weed sci.

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Barley (Hordeum vulgareL. ‘Advance’) and wild oat (Avena fatuaL. # AVEFA) were grown in the field in monoculture and mixed culture (additively) to compare their seasonal growth and development. Barley and wild oat tiller and tiller head production were reduced by the interference (higher density) of the other species. Plant height of either species was not affected by interference of the other. Wild oat biomass was reduced more and at an earlier growth stage (two to three tillers) than was barley biomass (heading) in mixed culture. Barley and wild oat grown in monoculture had similar total plant nitrogen content throughput the growing season. Gas exchange and water potential of barley and wild oat in monoculture and mixed culture were similar. All measurements indicated that barley and wild oat grown in monoculture had growth and development patterns that were similar. In mixed culture, however, barley was more competitive with wild oat than wild oat was with barley. Wild oat reduced barley yield component quality and grain yield.

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The effect ol certain species of weeds on the grain yield of spring barley

Cited by 4 publications

References 4 publications

Economic thresholds for wild radish, wild oat, hemp-nettle and corn spurry in spring barley

Economic thresholds for wild radish, wild oat, hemp-nettle and corn spurry in spring barley

Weed Characteristics of the Labiatæ, with Special Reference to Allelopathy

Wild Oat (Avena fatua) and Spring Barley (Hordeum vulgare) Growth and Development in Monoculture and Mixed Culture

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