Phenology of common lambsquarters growth parameters

Colquhoun, Jed; Stoltenberg, David E.; Binning, Larry K.; Boerboom, Chris M.

doi:10.1614/0043-1745(2001)049[0177:poclgp]2.0.co;2

Cited by 24 publications

(31 citation statements)

References 25 publications

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“…Chenopodium album germinated late and was effectively suppressed by the wheat, especially at higher densities in the uniform pattern. In the absence of such suppression, C. album can be taller than wheat (Colquhoun et al . 2001).…”

Section: Discussionmentioning

confidence: 99%

Influence of sowing density and spatial pattern of spring wheat (Triticum aestivum) on the suppression of different weed species

Olsen

Kristensen

Weiner³

2006

Weed Biology and Management

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To better understand the potential for improving weed management in cereal crops with increased crop density and spatial uniformity, we conducted field experiments over two years with spring wheat (Triticum aestivum) and four weed species: lambsquarters (Chenopodium album), Italian ryegrass (Lolium multiflorum), white mustard (Sinapis alba), and chickweed (Stellaria media). The crops were sown at three densities (204, 449, and 721 seeds m −2 ) and in two spatial patterns (normal rows and a highly uniform pattern), and the weeds were sown in a random pattern at a high density. In most cases, the sown weeds dominated the weed community but, in other cases, naturally occurring weeds were also important. There were strong and significant effects regarding the weed species sown, the crop density, and the spatial distribution on the weed biomass in both years. The weed biomass decreased with increased crop density in 29 out of 30 cases. On average, the weed biomass was lower and the grain yield was higher in the uniform compared to the row pattern in both 2001 and 2002. Despite the differences in weed biomass, the responses of L. multiflorum, S. media, and C. album populations to crop density and spatial uniformity were very similar, as were their effects on the grain yield. Sinapis alba was by far the strongest competitor and it responded somewhat differently. Our results suggest that a combination of increased crop density and a more uniform spatial pattern can contribute to a reduction in weed biomass and yield loss, but the effects are smaller if the weeds are taller than the crop when crop-weed competition becomes intense.

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Section: Discussionmentioning

confidence: 99%

Influence of sowing density and spatial pattern of spring wheat (Triticum aestivum) on the suppression of different weed species

Olsen

Kristensen

Weiner³

2006

Weed Biology and Management

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“…Según Colquhoun et al (2001), estos investigadores, al estudiar en cámaras de crecimiento el efecto de la temperatura y del fotoperíodo sobre la longitud de tallos, encontraron que la altura de los mismos se incrementaba con el aumento de la temperatura, siendo 1,55 m y 0,26 m, con fotoperíodos de 16 y 8 horas de luz, respectivamente. En las condiciones de este ensayo, se registraron temperaturas similares a las mencionadas por Huang et al (2001) y Roman et al (1999, que le permitieron alcanzar y superar en altura al cultivo, aunque la emergencia de maleza y cultivo hayan sido simultáneas (Tabla 1).…”

Section: Resultados Y Discusiónunclassified

“…Un índice bajo indica que en la distribución actúan numerosas plantas, que se desarrollan en torno a una planta principal o sobresaliente. El desarrollo de estrategias alternativas, basadas en el conocimiento de la biología y ecología de CHEAL, es necesario, particularmente, en bajas densidades de malezas, lo que es común en sistemas de cultivos (Colquhoun et al, 2001). Los resultados de este ensayo coinciden con lo expresado por Gramid & Stoltenberg (2009) respecto a que esta maleza incrementa su altura, la biomasa de tallos y disminuye la biomasa de hojas cuando crece bajo el canopeo de un cultivo.…”

Section: Resultados Y Discusiónunclassified

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Índice de agresividad espacial (IAE) de Chenopodium album en el cultivo de algodón para santiago del estero, Argentina

Ochoa¹,

Chaila²,

Sobrero³

2011

Planta daninha

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RESUMEN -El Índice de Agresividad Espacial (IAE) es un parámetro bioecológico que indica las características de la distribución de malezas. No existen antecedentes sobre el tema en el cultivo de algodón. El objetivo de este trabajo fue determinar el IAE para Chenopodium album (CHEAL) y relacionarlo con las pérdidas de rendimiento. Se trabajó durante la campaña 2007-2008 en el Campo Experimental de la EEA INTA Santiago del Estero, con el cultivar Guazuncho-INTA. Para el cálculo del IAE, se utilizó un modelo que emplea: altura de planta sobresaliente, su biomasa seca y superficie infestada; número de descendientes, biomasa seca y altura media de los mismos. Dentro del cultivo, en 200 m 2 , fueron marcadas 10 áreas de 1 m 2 . Se realizaron análisis estadísticos paramétricos, ANOVA y Tukey (0,05). Los resultados fueron: a) Algodón: peso de parcela medio: 105.000 g; peso por planta: 597 g; el total de plantas: 79,30; altura media: 0,5951 m; rendimiento medio: 2592 kg ha -1 y, b) CHEAL: peso por parcela: 4920 g; n o de plantas por parcela media: 18,7; altura media: 2,72 m; altura de planta madre de maleza: 3,45 m; 187 plantas hijas, medias con 2,40 m de altura y 58 g de biomasa seca, en la parcela de la planta sobresaliente. El rendimiento de algodón fue de 2.329,50 kg ha -1 en el testigo y las pérdidas medias fueron de 89,76%. El IAE obtenido fue de 3,76 (bajo-intermedio) e indica que, en la distribución, actúan numerosas plantas que se desarrollan en torno a una maleza principal. Con un menor IAE, son mayores las pérdidas producidas en el cultivo de algodón.Palabras-clave: CHEAL, distribución, malezas, modelo, rendimiento.ABSTRACT -The Space Aggressiveness Index (SAI) is a bio-ecological parameter that depicts weed distribution characteristics. There are not antecedents about this subject in cotton crop. This paper was aimed at determining the space aggressiveness index for Chenopodium album (CHEAL) and relating it to yield losses. Work was done on the Guazuncho-INTA cultivar throughout the 2007-2008 campaign in La Maria Experimental Field, EEA INTA Santiago del Estero. To compute the space aggressiveness index a model that includes the outstanding height, dry biomass, and infected area of the individual plant together with the quantity, dry biomass and average height of the offspring was used. The 200 sq m cropland was divided into ten plots and parametric statistical analyses, ANOVA, and Tukey test (0,05) were made. As to the the results obtained were: a) Cotton: -average weight per plot: 105.000 g; -weight per plant: 597 g; total number of plants: 79,30; average height: 0,59 m; average yield: 2,592 kg ha 1 and, b) CHEAL: weight per plot: 4,290 g; average number of individuals per plot: 18,7; average height: 2,72 m; parent plant height: 3,45 m whereas for the offspring the figures were: 187 individuals; average height: 2,40 m; average dry matter: 58 g in plot of surpassing plant. Cotton yield was 2,329,50 kg ha -1 and crop losses were of 89,76%. The space aggressiveness index obtained was that of 3,76 (i.e. low-in...

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“…(2003) found similar decreases for A. retroflexus when grown within a maize canopy and Légère and Schreiber (1989) found that A. retroflexus biomass was reduced in the presence of a soyabean canopy. Colquhoun et al. (2001) found that C. album height were similar with (∼40–110 cm at 700 growing degree days) and without (∼70–100 cm at 700 growing degree days) a soyabean crop, although the differences among years were greater in the treatments where soyabean was present.…”

Section: Weed Characteristicsmentioning

confidence: 93%

Predispersal seed predation of Amaranthus retroflexus and Chenopodium album growing in soyabean fields

2003

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Summary Field experiments were made in 1998 and 1999 to determine the influence of tillage and soyabean (Glycine max) row width on predispersal weed seed predation in Amaranthus retroflexus L. (redroot pigweed) and Chenopodium album L. (common lambsquarters). Soyabean was planted in wide (76 cm) and narrow (19 cm) rows with conventional or conservation tillage. Additional control plots without soyabean were also established. The two objectives were to determine (1) whether predispersal seed predation occurs in A. retroflexus or C. album, and (2) whether disturbance (soil tillage) or microclimate (planting pattern) influence predation level. Mean rates of seed predation were 26% and 4% in A. retroflexus and C. album, respectively. Although these levels were low at the population level, individual plants of both species had predation levels ranging from 0% to 80%, however, very few individuals of C. album had levels of predation above 10%. Differences among tillage and row width treatments occurred for A. retroflexus, but not for C. album. Amaranthus retroflexus and C. album growing within the soyabean crop received less light than those in the no‐crop plots, and produced less above‐ground biomass, smaller terminal inflorescences, and fewer seeds per inflorescence. Plant height, terminal inflorescence weight, and total seeds were correlated with predation in both weed species.

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Phenology of common lambsquarters growth parameters

Cited by 24 publications

References 25 publications

Influence of sowing density and spatial pattern of spring wheat (Triticum aestivum) on the suppression of different weed species

Influence of sowing density and spatial pattern of spring wheat (Triticum aestivum) on the suppression of different weed species

Índice de agresividad espacial (IAE) de Chenopodium album en el cultivo de algodón para santiago del estero, Argentina

Predispersal seed predation of Amaranthus retroflexus and Chenopodium album growing in soyabean fields

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