Competition between Peas Grown for Processing and Weeds

Nelson, D. C.; Nylund, R. E.

doi:10.2307/4040784

Cited by 38 publications

(32 citation statements)

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“…The effect was on the yields rather than on the numbers of weeds. This is in accordance with earlier studies of competition between weeds and cultivated plants, which likewise have demonstrated that dense stands of cultivated crops are effective in reducing weed yields (Winifred and Brenchley 1917, Granström 1962, Nelson and Nylund 1962, Weber and Staniforth 1957, Wiese et al 1964. Nitrogen fertilization has been found to increase the numbers and yields of weeds in cereal crops (Suomela and Paatela 1962).…”

Section: Discussionsupporting

confidence: 90%

Growth of weeds in cereal populations

Erviö

1972

AFSci

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The weeds in this study consisted mainly of Chenopodium album, Stellaria media, Viola arvensis, Polygonum convolvulus, P. aviculare and P. lapathifolium. Increasing cereal seed rates reduced the numbers, individual weights and total yields of the most abundant species, Chenopodium album. The decreases in plant weight and total yield of the weeds were very steep when the cereal seed rate was raised from 25 to 200 kg/ha. Increases in the seeding rate reduced the total yields of weeds rather than their numbers. The effect of the cereal on weeds became apparent as soon as heading of the cereal was complete and was further enhanced by prolonged competition. Added nitrogen raised the weed yields at cereal seed rates of 25—100 kg/ha but reduced them at higher seed rates. Nitrogen also raised the yield and individual plant weight of C. album. Cereal seed rate did not affect the nitrogen, phosphorus, potassium, calcium and magnesium contents of the weeds grown among the crop. Due to larger total weed yields, however, the amounts of these nutrients in the weeds were higher in sparse than in dense cereal populations.

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Section: Discussionsupporting

confidence: 90%

Growth of weeds in cereal populations

Erviö

1972

AFSci

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“…For a long-lasting effect, the composition of cover crop residues should delay residue decomposition and N mineralisation. Parameters for the biochemical makes them susceptible to weed competition (Nelson & Nylund, 1962).…”

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confidence: 99%

The suitability of non-legume cover crops for inorganic soil nitrogen immobilisation in the transition period to an organic no-till system

Rühlemann

Schmidtke

2016

Plant Production Science

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“…Nelson and Nylund (1962) Increasing field pea plant density significantly reduced weed biomass in 2 of 3 yr. Several studies have shown that increasing field pea populations reduce weed biomass (Marx und Hagedo* 196l; Lawson and Topham 1985; iownley-Smith-and Wright 1994), but none reported significant di-fferences among cultivars' In this study, while the The cultivar-by-seeding-rate interaction was significant n^J994 and 1995 only, while the cultivar 2n4 segling rate effects were significant in 1993. In all 3 yr, seed /ields increased with field pea plant density.…”

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confidence: 99%