Effects of weed interference and herbicides on nitrate and carotene accumulation in lettuce

Giannopolitis, C. N.; Vassiliou, G.; Vizantinopoulos, S.

doi:10.1021/jf00086a008

Cited by 11 publications

(12 citation statements)

References 11 publications

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“…Although pendimethalin did not negatively affect Lollo rossa lettuce varieties, it did negatively influence the development of a closed head of iceberg lettuce . Pendimethalin also accelerates the accumulation of nitrates and reduces carotene accumulation in lettuce leaves, especially in rainy weather conditions …”

Section: Introductionmentioning

confidence: 99%

“…4 Pendimethalin also accelerates the accumulation of nitrates and reduces carotene accumulation in lettuce leaves, especially in rainy weather conditions. 7 Transparent non-woven fabric covers are primarily used to accelerate the development and increase lettuce yield and quality, 8,9 which aspects are particularly important during low-temperature seasons. 9 At the same time, however, these covers can positively affect the growth and development of weeds.…”

Section: Introductionmentioning

confidence: 99%

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Effect of a non‐woven fabric covering on the residual activity of pendimethalin in lettuce and soil

Jursík

Kovacova

Kočárek

et al. 2016

Pest Management Science

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of a non‐woven fabric covering on the residual activity of pendimethalin in lettuce and soil

Jursík

Kovacova

Kočárek

et al. 2016

Pest Management Science

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“…A interferência pode promover redução entre 30 a 45% na produtividade quando a competição ocorre nos primeiros estádios de desenvolvimento da cultura. Além disso, afetam a firmeza de suas folhas e, também, o conteúdo de nitrato e caroteno (GIANNOPOLITIS; VASSILIOU; VIZANTINOPOULOS, 1989). Em culturas folhosas, as plantas daninhas também favorecem a umidade das folhas, aumentando, assim, a incidência de doenças, diminuindo a qualidade do produto e o valor comercial (LORENZI, 2006).…”

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Período total de prevenção a interferência das plantas daninhas na cultura da alface cultivar Solaris

2011

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ResumoEste trabalho foi realizado com o objetivo de determinar o período total de prevenção à interferência (PTPI) das plantas daninhas na cultura da alface do tipo crespa, cultivar Solaris. O experimento foi instalado na Universidade Estadual de Londrina, no período de outono/ inverno de 2008. A cultura permaneceu livre da interferência das plantas daninhas desde o transplante até: 0, 10, 20, 30, 40, 50 e 60 dias. O delineamento utilizado foi o de blocos casualizados com quatro repetições. A comunidade infestante da área foi composta principalmente de Bidens pilosa, Amaranthus hybridus, Oxalis corniculata, Euphorbia heterophylla, Spinacia oleracea, Commelina benghalensis e Lepidium virginicum. As massas seca e fresca das plantas daninhas e o número de folhas da cultura foram determinados. Admitindo-se 5% de tolerância na redução da produtividade da cultura, o período total de prevenção à interferência (PTPI) ocorreu 21 dias após o transplante. A interferência das plantas daninhas durante todo o ciclo de vida da alface reduziu a produtividade em 25%. Palavras-chave: Lactuca sativa L, matointerferência, competição AbstractThis research work aimed to determine the total period of interference of weeds prevention of lettuce cultivar Solaris. The experiment was conducted in Universidade Estadual de Londrina, in the period of autumn/ winter of 2008. The lettuce crop remained free from weed interference from emergence up to 0, 10, 20, 30, 40, 50 e 60 days. The experiment was arranged in a randomized block design with four replications. The weed community was composed by Bidens pilosa, Amaranthus hybridus, Oxalis corniculata, Euphorbia heterophylla, Spinacia oleracea, Commelina benghalensis e Lepidium virginicum. It was determined dry and fresh matter of weeds, and number of lettuce leaves. Assuming a tolerance of 5% for crop production decrease, it was verified that the total period of interference prevention (TPIP) occurred up to 21 days after transplanting. Weed interference throughout the crop cycle reduced 25% of its yield.

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“…and were Lettuce marketability depends on production of a high-quality product (Ryder, 1979). Weed competition reduces lettuce yield and quality (Dusky and Shrefler, 1992;Giannopolitis et al, 1989;Roberts et al, 1977;Shrefler et al, 1991). Frequent cultivation and hand-weeding are required to produce lettuce on Florida's high-organic-matter soils (Histosols) because few efficacious herbicides are registered .…”

Section: Methodsmentioning

confidence: 99%

“…Weeds cause yield loss in lettuce by reducing crop quality. Head firmness, leaf size (Roberts et al, 1977), and nitrate and carotene content (Giannopolitis et al, 1989) are quality traits sensitive to weed interference. The relative effect of weed competition on these traits, (Kader et al, 1973).…”

Section: Methodsmentioning

confidence: 99%

Spiny Amaranth (Amaranthus spinosus L.), A Serious Competitor to Crisphead Lettuce (Lactuca sativa L.)

Shrefler¹,

Stall²,

Dusky³

1996

HortSci

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Three field studies on high-organic-matter soils were conducted to determine the zone of influence of spiny amaranth on lettuce head quality. Spiny amaranth reduced lettuce head firmness at all distances from the weed, ≤105 cm. Lettuce ribbiness increased at 15 and 45 cm compared with the weed-free control. Untrimmed lettuce head weight was not affected by spiny amaranth presence beyond 45 cm. Trimmed lettuce head weight was reduced at all distances compared with the control. Stem diameter and core length were not affected by spiny amaranth competition. The presence of a single spiny amaranth plant significantly influenced some lettuce quality traits at ≤105 cm.

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Effects of weed interference and herbicides on nitrate and carotene accumulation in lettuce

Cited by 11 publications

References 11 publications

Effect of a non‐woven fabric covering on the residual activity of pendimethalin in lettuce and soil

Effect of a non‐woven fabric covering on the residual activity of pendimethalin in lettuce and soil

Período total de prevenção a interferência das plantas daninhas na cultura da alface cultivar Solaris

Spiny Amaranth (Amaranthus spinosus L.), A Serious Competitor to Crisphead Lettuce (Lactuca sativa L.)

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