Soybean Seeding Rate Effects on Weed Management

Arce, Guillermo D.; Pedersen, Palle; Hartzler, Robert G.

doi:10.1614/wt-08-060.1

Cited by 55 publications

(55 citation statements)

References 33 publications

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“…Additionally, in the MG IV region, the high seeding rate reduced pigweed biomass per square meter, biomass per plant, and seeds per square meter by 63, 57, and 67%, respectively, compared with the moderate and low seeding rates. Therefore, our results are consistent with previous findings that soybean row width and seeding rate reduced weed biomass and seed production, but not pigweed density (Arce et al 2009;Légère and Schreiber 1989). The PRE fb POST herbicide strategy was the most consistent factor to influence end-of-season pigweed density, height, biomass, and fecundity.…”

Section: Resultssupporting

confidence: 92%

“…Edwards et al (2005) found that high seeding rates increased LI and subsequently, cumulative intercepted photosynthetically active radiation (CIPAR), more quickly; however, low seeding rates still obtained the required CIPAR to achieve 90% of the asymptotic seed yield. More-over, seeding rate had little effect on reducing weed density in a conventional production system, but reduced weed biomass (Arce et al 2009). These variable effects from seeding rate manipulation have been attributed to soybean physiological adaptations.…”

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confidence: 99%

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Management of Pigweed (Amaranthusspp.) in Glufosinate-Resistant Soybean in the Midwest and Mid-South

et al. 2016

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Pigweeds are among the most abundant and troublesome weed species across Midwest and mid-South soybean production systems because of their prolific growth characteristics and ability to rapidly evolve resistance to several herbicide sites of action. This has renewed interest in diversifying weed management strategies by implementing integrated weed management (IWM) programs to efficiently manage weeds, increase soybean light interception, and increase grain yield. Field studies were conducted across 16 site-years to determine the effectiveness of soybean row width, seeding rate, and herbicide strategy as components of IWM in glufosinate-resistant soybean. Sites were grouped according to optimum adaptation zones for soybean maturity groups (MGs). Across all MG regions, pigweed density and height at the POST herbicide timing, and end-of-season pigweed density, height, and fecundity were reduced in IWM programs using a PRE followed by (fb) POST herbicide strategy. Furthermore, a PRE fb POST herbicide strategy treatment increased soybean cumulative intercepted photosynthetically active radiation (CIPAR) and subsequently, soybean grain yield across all MG regions. Soybean row width and seeding rate manipulation effects were highly variable. Narrow row width (≤ 38 cm) and a high seeding rate (470,000 seeds ha−1) reduced end-of-season height and fecundity variably across MG regions compared with wide row width (≥ 76 cm) and moderate to low (322,000 to 173,000 seeds ha−1) seeding rates. However, narrow row widths and high seeding rates did not reduce pigweed density at the POST herbicide application timing or at soybean harvest. Across all MG regions, soybean CIPAR increased as soybean row width decreased and seeding rate increased; however, row width and seeding rate had variable effects on soybean yield. Furthermore, soybean CIPAR was not associated with end-of-season pigweed growth and fecundity. A PRE fb POST herbicide strategy was a necessary component for an IWM program as it simultaneously managed pigweeds, increased soybean CIPAR, and increased grain yield.

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Section: Resultssupporting

confidence: 92%

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confidence: 99%

Management of Pigweed (Amaranthusspp.) in Glufosinate-Resistant Soybean in the Midwest and Mid-South

et al. 2016

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“…These results are relevant for shade issues, leaf senescence in the lower third, and flower and pod fixation (Board and Kahlon, 2011); they are also positive for phytosanitary control (Kumudini et al, 2008) and weed management (Arce et al, 2009 …”

Section: Resultsmentioning

confidence: 88%

Soybean morphophysiology and yield response to seeding systems and plant populations

Souza

Teixeira

Reis

et al. 2016

Chilean J. Agric. Res.

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“…Na safra 2007 não houve diferença de rendimento de grãos, comparando-se apenas cultivares (Tabela 3 A escolha da densidade de plantas interfere no manejo integrado da soja, uma vez que densidades indicadas pela pesquisa e assistência técnica buscam conferir estabilidade produtiva para os cultivares de soja, sob condições similares de manejo e ambiente. Por exemplo, Arce et al (2009) Os resultados desta pesquisa indicam haver relação entre algumas características morfoagronômicas; a magnitude dessa relação foi explorada via análise de correlação simples, a qual se mostrou negativa entre densidade e número de ramificações por planta (r = -0,35) e densidade e número de vagens por planta (r = -0,62), bem como entre densidade e altura de plantas. Essas relações sugerem haver capacidade compensatória da densidade de plantas sobre cada caráter avaliado.…”

Section: Resultsunclassified

Relação entre densidade de plantas e genótipos de soja roundup readyTM

et al. 2010

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RESUMO -A presente pesquisa teve por objetivo estudar a influência de diferentes densidades de plantas e genótipos de soja Roundup Ready™ (RR) em algumas características morfoagronômicas da soja, semeada em duas safras distintas. O experimento foi conduzido na região dos Campos de Cima da Serra, no Estado do Rio Grande do Sul, nas safras agrícolas 2006/07 e 2007/08, com os cultivares CD 213RR e BRS 255RR, nas densidades de 12, 18, 24, 30 e 36 plantas aptas por m 2 . O delineamento experimental utilizado foi de blocos ao acaso, com quatro repetições. Para isso, foram avaliados altura de plantas, diâmetro da haste, número de ramificações por planta, número de vagens por planta, número de grãos por planta, número de grãos por vagem, massa de mil grãos e rendimento de grãos por hectare. O manejo das plantas daninhas com glyphosate em duas etapas (pré-semeadura e em V4) evitou eficientemente a matocompetição. O aumento da densidade de plantas de soja RR promoveu incremento linear da altura das plantas (0,5 a 0,9 cm por planta m -2 ), influenciada pelo genótipo e pelo ano de cultivo. O diâmetro da haste foi diminuído com o aumento da densidade de plantas de soja RR de forma linear (-0,03 a -0,2 mm por planta m -2 ). O número de ramos por planta reduziu com o aumento da densidade (-0,05 a -0,19 ramos por planta). Na segunda safra, o rendimento de grãos e a massa de mil grãos foram menores, afetados por um período de estiagem e também por uma geada no final do ciclo, mais acentuadamente para o CD 213RR. A combinação de maior número de plantas m -2 levou a uma redução do número de vagens por planta e de grãos por vagem, embora de magnitudes distintas entre as cultivares, o que foi discutido pela interação entre os fatores; no entanto, o rendimento de grãos não foi alterado nas diferentes densidades testadas, e sim sofreu influência da safra de cultivo.Palavras-chave: características agronômicas, Glycine max, população de plantas, produtividade.ABSTRACT -This work studied the influence of different plant densities and Roundup Ready™ (RR) soybean genotypes, on some morphoagronomic characteristics of soybean sown in two distinct crops. The experiment was carried out in Campos de Cima da Serra in the state of Rio Grande do Sul, Brazil, in the 2006/07 and 2007/08 growing seasons with CD 213RR and BRS 255RR cultivars, at densities of 12, 18, 24, 30 and 36 suitable plants m -2 . The experimental layout used was randomized blocks with four repetitions. Plant height, stem diameter, number of ramifications per plant, number of pods per plant, number of grains per plant, number of grains per pod, mass of a thousand grains and yield of grains per hectare were evaluated. Weed plant management with glyphosate in two applications (pre-sowing and V4) efficiently prevented weed competition. Increasing RR soybean plant density led to a linear increase in plant height (0.5 to 0.9 cm per plant m -2 ), influenced by genotype and crop year. Stem diameter reduced linearly with an increase in plant density (-0.03 to -0.2 mm per plant m -2 ). Th...

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Soybean Seeding Rate Effects on Weed Management

Cited by 55 publications

References 33 publications

Management of Pigweed (Amaranthusspp.) in Glufosinate-Resistant Soybean in the Midwest and Mid-South

Management of Pigweed (Amaranthusspp.) in Glufosinate-Resistant Soybean in the Midwest and Mid-South

Soybean morphophysiology and yield response to seeding systems and plant populations

Relação entre densidade de plantas e genótipos de soja roundup readyTM

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