Interference of Palmer Amaranth (<i>Amaranthus palmeri</i>) in Sweetpotato

Meyers, Stephen L.; Jennings, Katherine M.; Schultheis, Jonathan R.; Monks, David W.

doi:10.1614/ws-d-09-00048.1

Cited by 67 publications

(95 citation statements)

References 27 publications

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“…This calculation was based on the method used by Meyers et al . ().

{PAR}_{%} = false({PAR}_{L . r i g i d u m} false/ {PAR}_{Crop} false) \times 100

…”

Section: Methodsmentioning

confidence: 97%

“…The PAR available to the L. rigidum canopy in the inter-row space was calculated as a percentage of the total available PAR (PAR % ), using Eqn (1). This calculation was based on the method used by Meyers et al (2010). (139) 186 (144) 291 (191) 400 (255) 456 (395) 611 (352) Average annual (and growing season) rainfall (mm) 291 (191) 306 (240) 347 (292) 291 (191) 306 (240) 347 (292)…”

Section: Measurementsmentioning

confidence: 99%

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Manipulating crop row orientation and crop density to suppress Lolium rigidum

Borger¹,

Hashem

Powles

2015

Weed Research

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Summary Light is an important resource that crops and weeds compete for and so increased light interception by the crop can be used as a method of weed suppression in cereal crops. This research investigated the impact of altered availability of photosynthetically active radiation (PAR) (from crop row orientation or seeding rate) on the growth and fecundity of Lolium rigidum. Wheat and barley crops were sown in an east–west (EW) or north–south (NS) direction, at a high or low seeding rate, in three field trials in 2010 and 2011 (at Merredin, Wongan Hills and Katanning, Western Australia). The average PAR available to L. rigidum in the inter‐row space of EW crops compared with NS crops was 78% to 91% at crop tillering, 39% to 56% at stem elongation, 28% to 53% at boot/anthesis and 41% to 59% at grain fill. Reduced PAR in the EW crop rows resulted in reduced L. rigidum fecundity in five of the six trials (average of 2968 and 5705 L. rigidum seeds m−2 in the EW and NS crops). Availability of PAR was not influenced by seeding rate, but the high seeding rate reduced fecundity in three of the six trials (average of 3354 and 5092 seeds m−2 in the crops with high and low seeding rate). Increased competitive ability of crops (through increased interception of PAR or increased crop density) was highly effective in reducing L. rigidum fecundity and is an environmentally friendly and low cost method of weed suppression.

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“…This calculation was based on the method used by Meyers et al . ().

{PAR}_{%} = false({PAR}_{L . r i g i d u m} false/ {PAR}_{Crop} false) \times 100

…”

Section: Methodsmentioning

confidence: 97%

Section: Measurementsmentioning

confidence: 99%

Manipulating crop row orientation and crop density to suppress Lolium rigidum

Borger¹,

Hashem

Powles

2015

Weed Research

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“…The upright growth of Palmer amaranth shades the sweet potato canopy, intercepting more than 65% of available light beginning at 6 WAP. There was a linear relationship between level of light interception and yield loss, with a 1.1 to 1.35% yield loss for each percentage of light intercepted by Palmer amaranth (Meyers et al 2010).…”

Section: Agricultural Impacts Of Palmer Amaranthmentioning

confidence: 95%

“…is also a lowgrowing crop in which Palmer amaranth interference reduces yield quantity and quality (Meyers et al 2010). The highest grade of sweet potatoes, 'Jumbo', is reduced 56 and 94% from Palmer amaranth densities of 0.47 and 6.13 plants m À2 , respectively, with 'marketable' grade reduced 36 and 81% at these densities (Meyers et al 2010). The threshold density of Palmer amaranth that is equivalent to 10% yield loss is 0.08 plants m À2 , or one plant every 12.5 m 2 .…”

Section: Agricultural Impacts Of Palmer Amaranthmentioning

confidence: 99%

Palmer Amaranth (Amaranthus palmeri): A Review

Webster²,

2013

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In little over 20 yr, Palmer amaranth has risen from relative obscurity to its current status as one of the most widespread, troublesome, and economically damaging agronomic weeds in the southeastern U.S. Numerous factors have enabled Palmer amaranth to become such a dominant and difficult-to-control weed, including its rapid growth rate, high fecundity, genetic diversity, ability to tolerate adverse conditions, and its facility for evolving herbicide resistance. It is both a serious threat to several U.S. cropping systems and a fascinating model weed. In this paper, we review the growing body of literature on Palmer amaranth to summarize the current state of knowledge on the biology, agricultural impacts, and management of this weed, and we suggest future directions for research.

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“…Dessa forma, essa variável é muito usada em estudos de interferência em múltiplas combinações cultura/infestante(s), como se comprova pelos estudos em batata-doce (Stephen et al, 2010;Meyers et al, 2010), em arroz (Bhagirath et al, 2010), em beterraba (Odero et al, 2010a,b) e em soja (Kelly & Smoot, 2010).…”

Section: Introductionunclassified

Aplicação de modelos múltiplos na determinação de níveis de prejuízo para a interação Solanum americanum e tomate de indústria

Portugal

Moreira²

2011

Planta daninha

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3RESUMO -Este estudo apresenta um conceito unificador, que conjuga as teorias de densidade crítica e período crítico. Hipotetiza-se que não existe um valor fixo para a densidade crítica e para o período crítico, mas que os seus valores são interdependentes. A demonstração dessa hipótese é fundamentada em estudos de interferência entre Solanum americanum e o tomateiro. Aos resultados da produção de cinco ensaios, aplicaram-se modelos múltiplos de regressão, tendo como variáveis independentes a densidade e o número de dias de convivência entre a infestante e a cultura. A aplicação do Nível de Tolerância (NT) à representação gráfica num plano das equações estimadas a partir de modelos múltiplos permite responder à questão: Quanto tempo pode permanecer uma determinada infestação de Solanum americanum sem causar prejuízo na cultura do tomateiro? É ainda possível verificar que a variação dos custos do controle e dos preços da cultura faz variar o NT e, concomitantemente, o tempo admissível, sem causar prejuízo, do Solanum americanum na cultura do tomateiro.Palavras-chave: modelo múltiplo de competição, nível de tolerância, interferência.ABSTRACT -This study introduces a unifying concept combining the theory of critical density and critical period of weed infestation. It is hypothesized that these two periods are interdependent, rather than fixed values. The hypothesis is based on studies of interference between Solanum americanum and the tomato crop. Multiple regression models were applied to the results of five field trials. The independent variables were density and number of days of weed and culture cohabitation. Applying the Tolerance Level (TL) to the graphic representation (2D) of the equations estimated from multiple non-linear models allowed answering the following question: how long does a particular infestation of Solanum americanum remain without causing injury to the tomato crop? It was also possible to conclude that the variation of control costs and crop prices changes the TL values, concomitantly changing the time allowable for the presence of Solanum americanum in the tomato crop, without causing yield loss.

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Interference of Palmer Amaranth (Amaranthus palmeri) in Sweetpotato

Cited by 67 publications

References 27 publications

Manipulating crop row orientation and crop density to suppress Lolium rigidum

Manipulating crop row orientation and crop density to suppress Lolium rigidum

Palmer Amaranth (Amaranthus palmeri): A Review

Aplicação de modelos múltiplos na determinação de níveis de prejuízo para a interação Solanum americanum e tomate de indústria

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