Competition of Setaria faberii with Corn and Soybeans

Knake, Ellery L.; Slife, F. W.

doi:10.2307/4040555

Cited by 119 publications

(90 citation statements)

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“…Whereas annual grass and broadleaf control was inconsistent and averaged 79, 88, and 92% at the 5-, 10-, and 15-cm timings, respectively, a significant reduction in corn grain yield was evident only when applications were delayed until weeds were 23 or 30 cm in height. These results agree with previous reports that suggested that little or no corn grain yield loss resulted from secondary flushes or regrowth that occurred after herbicide application (Carey and Kells 1995;Knake and Slife 1962). Averaged across all sites in 1998 and 1999, corn grain yield from one glyphosate application at the 5-, 10-, 15-, 23-, and 30-cm timings was 93, 94, 93, 91, and 79% of the weed-free control, respectively (Figure 3).…”

Section: Resultssupporting

confidence: 94%

“…Subsequent application timings at each site also resulted in reduced yield. The degree of early-season weed interference in corn varies with weed density, species composition of the weed population, and environmental conditions (Hall et al 1992;Knake and Slife 1962;Lindquist et al 1999;Moolani et al 1964;Stoller et al 1993;Young et al 1984). In this study, corn yield loss occurred over the entire range of application timings but did not occur at some sites even at the 30-cm application timing.…”

Section: Resultsmentioning

confidence: 63%

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Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study¹

et al. 2003

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Field studies were conducted at 35 sites throughout the north-central United States in 1998 and 1999 to determine the effect of postemergence glyphosate application timing on weed control and grain yield in glyphosate-resistant corn. Glyphosate was applied at various timings based on the height of the most dominant weed species. Weed control and corn grain yields were considerably more variable when glyphosate was applied only once. The most effective and consistent season-long annual grass and broadleaf weed control occurred when a single glyphosate application was delayed until weeds were 15 cm or taller. Two glyphosate applications provided more consistent weed control when weeds were 10 cm tall or less and higher corn grain yields when weeds were 5 cm tall or less, compared with a single application. Weed control averaged at least 94 and 97% across all sites in 1998 and 1999, respectively, with two glyphosate applications but was occasionally less than 70% because of late emergence of annual grass and Amaranthus spp. or reduced control of Ipomoea spp. With a single application of glyphosate, corn grain yield was most often reduced when the application was delayed until weeds were 23 cm or taller. Averaged across all sites in 1998 and 1999, corn grain yields from a single glyphosate application at the 5-, 10-, 15-, 23-, and 30-cm timings were 93, 94, 93, 91, and 79% of the weed-free control, respectively. There was a significant effect of herbicide treatment on corn grain yield in 23 of the 35 sites when weed reinfestation was prevented with a second glyphosate application. When weed reinfestation was prevented, corn grain yield at the 5-, 10-, and 15-cm application timings was 101, 97, and 93% of the weed-free control, respectively, averaged across all sites. Results of this study suggested that the optimum timing for initial glyphosate application to avoid corn grain yield loss was when weeds were less than 10 cm in height, no more than 23 d after corn planting, and when corn growth was not more advanced than the V4 stage.

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Section: Resultssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 63%

Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study¹

et al. 2003

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“…In our study 120 plants m -2 of green foxtail were estimated to cause a 26% yield loss of corn. Beckett et al (1988) reported an 18% corn yield loss in Illinois with 13 giant foxtail (Setaria faberi) clumps (five to eight plants Knake and Slife (1962) found a 25% corn yield reduction with approximately 150 giant foxtail plants per meter of row. Giant foxtail has been reported to be more competitive than green foxtail (Staniforth 1965).…”

Section: Discussionmentioning

confidence: 99%

Impact of lamb’s-quarters, common ragweed and green foxtail on yield of corn and soybean in Ontario

Weaver¹

2001

Can. J. Plant Sci.

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Weaver, S. E. 2001. Impact of lamb's-quarters, common ragweed and green foxtail on yield of corn and soybean in Ontario. Can. J. Plant Sci. 81: 821-828. Field studies were conducted in Harrow, Ontario, from 1990 to 1993 to quantify the relationship between yield of field corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] and density of lamb's-quarters (Chenopodium album L.), common ragweed (Ambrosia artemisiifolia L.), and green foxtail [Setaria viridis (L.) Beauv.]. Experiments were conducted separately for each weed and crop combination. Weeds emerged at the same time as or within a week of the crop. Coefficients of the rectangular hyperbolic damage function were estimated for each year and pooled over years. In both crops, lamb's-quarters was the most competitive of the three weed species, and green foxtail was the least competitive at low densities. Maximum yield loss at high weed density varied with weed species in field corn, but not in soybean. The estimated competition coefficients of the damage function have been incorporated in a decision support system for integrated weed management in Ontario. Les adventices lèvent en même temps que la culture ou dans la semaine qui suit. L'auteur a estimé les coefficients de l'hyperbole rectangulaire servant à évaluer les dommages chaque année avant d'en faire la moyenne. À faible densité, le chénopode blanc est l'adventice la plus compétitive dans les deux cultures, la sétaire verte se trouvant à l'autre extrémité de la courbe. La baisse de rendement maximale à une forte densité d'adventices varie avec le type de mauvaise herbe dans les champs de maïs mais pas dans ceux de soja. Les coefficients de concurrence estimatifs des adventices ont été ajoutés à la fonction utilisée pour évaluer les dommages en vue d'élaborer un système qui permettra d'étayer les décisions relatives à une lutte intégrée contre les mauvaises herbes en Ontario.

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“…No momento em que um determinado cultivar de soja apresentar FIGURA 2. Efeito de 115 dias de competição de Euphorbia heterophylla L. sobre o rendimento de grãos dos cultivares de soja de ciclo médio (Hood e IAS-4), EEA/UFRGS,Guaíbo, RS, 1979/80. um crescimento rápido e vigoroso determinará uma limitação de luz, reduzindo a agressividade das plantas daninhas, sobrepujando-as (14 ).…”

Section: Resultsunclassified

Avaliação de cultivares de soja (Glycine max (L.) Merril) em competição com Euphorbia heterophylla L. sob três densidades e dois períodos de ocorrência

Chemale¹,

Fleck

1982

Planta daninha

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SUMMARY EVALUATION OF SOYBEAN (Glycine max (L.) Merrill) CULTIVARS IN COMPETITION WITH Euphorbia heterophylla L. IN THREE DENSI-TIES AND TWO PERIODS OF OCCURRENCEA field experiment was performed at the Agronomy Experimental Station of UFRGS, in Guaíba, RS, Brazil, during the 1979/80 growing se ason , in or de r to te st fo ur so yb ea n cu ltiv a rs (P ara ná , Pra ta , Hood e IAS-4) in comp eti tio n wi th Euph or bi a heterop hyl la L. esta bli she d in three densities (0, 12 and 54 plants/m 2 ) during two periods (45 and 115 days after soybean emergence). I t wa s obse rve d tha t soybe an cul tiva rs pre sent ed re ducti on of seed yi eld s und er th e eff ect of th e pe ri od s of comp eti ti on and de ns iti es of Euph or bia hete roph yl la L. The nu mb er of se eds and pod s pe r are a we re cons id era bly reduced in the presence of the weed associated with the longest competition period.The ste m diam ete r and nu mb er of no des were reduced only by competition of the highest Euphorbia de nsity; howeve r, the numbe r of branches and leaf are a index, this after a period o f 7 5 d a y s o f c ro p-w e e d a s s o c i a ti o n , w e re already reduced by a density of 12 plants/m 2 of Euphorbia heterophylla L.KEY WO RD S: We eds, comp eti ti on, Euph orbia heterophyllaL., soybean, cultivars. INTRODUÇÃOA competição com plantas daninhas é um dos fatores que mais afeta a produtividade da cultura da soja, podendo ocasionar redução de 90% em seu rendimento quando tais espécies não são consideradas (2 ).A competição por luz, água e nutrientes são os principais fatores ambientais pelos quais concorrem cultura e plantas dan inha s. O pod er de int erc ept ação de luz pelas plantas daninhas é fator impor-

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Competition of Setaria faberii with Corn and Soybeans

Cited by 119 publications

References 0 publications

Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study¹

Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study¹

Impact of lamb’s-quarters, common ragweed and green foxtail on yield of corn and soybean in Ontario

Avaliação de cultivares de soja (Glycine max (L.) Merril) em competição com Euphorbia heterophylla L. sob três densidades e dois períodos de ocorrência

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Competition of Setaria faberii with Corn and Soybeans

Cited by 119 publications

References 0 publications

Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study1

Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study1

Impact of lamb’s-quarters, common ragweed and green foxtail on yield of corn and soybean in Ontario

Avaliação de cultivares de soja (Glycine max (L.) Merril) em competição com Euphorbia heterophylla L. sob três densidades e dois períodos de ocorrência

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Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study¹

Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study¹