Interference periods of velvet bean in sugarcane

Bressanin, Fernanda Nunes; Neto, Nelson Jayme; Nepomuceno, Mariluce Pascoína; Alves, Pedro Luís da Costa Aguiar

doi:10.1590/0103-8478cr20150630

Cited by 5 publications

(7 citation statements)

References 4 publications

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“…Kuva et al (2001) demonstrated that losses of up to 82% were observed in areas where the predominant weed species was signalgrass, while Kuva et al (2003) verified reductions of 40% in areas with mixed infestation of signalgrass and guinea grass. Other authors have also made similar observations for other weed species in sugarcane plantations in the state of São Paulo, whose potential yield loss varied according to the type of infestation of the area (Silva et al, 2009;Piza et al, 2016;Bressanin et al, 2016).…”

Section: Introductionsupporting

confidence: 63%

“…Piza (2016) reported interference of I. hederifolia from 76 days after emergence, reducing crop yield by 17.5%, but this species presents a small accumulation of dry matter and macronutrients at the beginning of its cycle, being intensified at 63 days after emergence, with maximum accumulation at 139 and 140 days, for I. hederifolia and I. quamoclit, respectively, so that it can be inferred that the most intense competition can occur only at the most advanced stage of development of the crop (Carvalho et al, 2009;Guzzo et al, 2010). This contrasts with what was observed for velvet bean, which also has a climbing habit, whose interference starts at 50 days after sprouting and lasts up to 188 days, reducing yield by 50% (Bressanin et al, 2016). On the other hand, coexistence with grasses U. plantaginea, P. maximum and D. horizontalis generally provided the greatest reductions in the growth of sugarcane, mainly for variety SP80-1842.…”

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confidence: 78%

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Interference Relationships Between Weeds and Sugarcane in the ‘Plene’ System

et al. 2019

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Sugarcane is one of the most important crops planted in Brazil in that the presence of weeds in the fields has promoted significant yield reduction. The objective of this work was to evaluate the differential growth response of two sugarcane varieties cropped in the ‘Plene’ system as a function of the coexistence with different weed species. Treatments consisted of the coexistence of Bidens pilosa plus Ipomoea quamoclit, Ipomoea hederifolia, Amaranthus viridis, Urochloa plantaginea, Panicum maximum, and Digitaria horizontalis with two sugarcane varieties (RB92579 and SP80-1842) cropped in the ‘Plene’ system, in addition to a control without weeds. The design was completely randomized with three replicates. Dry matter accumulation of weeds was dependent of the weed species and the sugarcane variety whose coexistence was kept. The behavior of development in terms of plant height, number of green leaves, leaf area, and dry mass of stems, roots and leaves was dependent on the sugarcane variety and on the weed species whose coexistence was kept. The weed U. plantaginea showed the greatest potential to interfere with the growth of both sugarcane varieties planted in the ‘Plene’ system. Panicum maximum and D. horizontalis are also potential competitors, while B. pilosa, I. quamoclit, I. hederifolia, and A. viridis are less competitive. The sugarcane variety RB92579 is less susceptible to weed interference than SP80-1842 when planted in the ‘Plene’ system.

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Section: Introductionsupporting

confidence: 63%

mentioning

confidence: 78%

Interference Relationships Between Weeds and Sugarcane in the ‘Plene’ System

et al. 2019

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“…The loss in sugarcane yield, coexisting with densities of Brachiaria decumbens and Brachiaria brizantha equivalent to 15 plants m -2 , may reach 60% (Tironi et al, 2013) and 50% (Galon et al, 2012), respectively. On the other hand, in competition with velvet bean, the loss of yield is close to 50% (Bressanin et al, 2016).…”

Section: Resultsmentioning

confidence: 93%

Weed interference in the initial growth of meristem-grown sugarcane plantlets

Paula

Esposti

Toffoli

et al. 2018

Rev. bras. eng. agríc. ambient.

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The use of new systems of sugarcane planting such as PleneTM, Plene EvolveTM, Plene PBTM and AgMusaTM requires specific studies on the initial interference of weed in the sugarcane crop. The objective of this study was to evaluate initial weed interference in meristem-grown sugarcane plantlets (Plene EvolveTM). The weed species used were Brachiaria decumbens and Panicum maximum, at four different densities (1, 2, 3 and 4 weed plants pot-1), plus a control treatment free from weed interference. The statistical design was completely randomized with four replicates per treatment, with an individual study for each weed species. The evaluations performed were: plant height at 45, 60 and 90 days after emergence (DAE), number of sugarcane tillers at 30, 60 and 90 DAE and dry matter of both sugarcane and weed plants at 90 DAE. B. decumbens and P. maximum caused reductions in the initial growth and development of sugarcane. P. maximum was more aggressive to meristem-grown sugarcane plants, during their early development, than B. decumbens.

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“…For the soil analysis, two undisturbed soil samples were collected in each plot, at depths of 0-10 cm, at the beginning and at the end of the experiment, to assess the physical attributes of the soil. The bulk density (Ds) was evaluated by the volumetric ring method (Blake and Hartge, 1986), the particle density or real (Dp) by the volumetric balloon method and the total porosity (VTP) by calculating VTP = 100 Â (Dp À Ds)/Dp (EMBRAPA, 1997).…”

Section: Methodsmentioning

confidence: 99%

Physical Properties of Soil and Glyphosate Residue as a Function of Cassava Weed Management by Cover Crops in the Amazon Ecosystem

Soares¹,

Pinto²,

Gama³

et al. 2021

horts

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Cassava production in Amazonas state deserves to be highlighted due to its great historical, social, and economic importance. Weed competition severely constrains cassava production in Amazonas. The use of cover crops is safe and very efficient at eliminating weeds while keeping the soil covered. The objective of this study was to evaluate physical properties of soil and glyphosate residues in storage roots as a function of the weed management in cassava. The experiment was carried out in a randomized complete block design with five treatments and five repetitions. The treatments were biological control with two species of cover plants (Brachiaria ruziziensis and Mucuna pruriens), chemical control, mechanical control, and treatment with no weed control. The cover crops characteristics evaluated were dry weight, the percentage of cover, and rate of decomposition of plant residues. In the soil, the bulk density and total porosity were determined. The contamination of the storage roots was evaluated based on the analysis of glyphosate residue. Brachiaria ruziziensis presented more dry weight and higher percentage of cover compared with M. pruriens, and both cover crops showed very similar decomposition rates. The physical properties of soil were unaffected by any treatment evaluated. There was no detection of glyphosate and its metabolite, aminomethylphosphonic acid (AMPA), in any treatment evaluated. Chemical control with glyphosate is not able to contaminate cassava storage roots.

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Interference periods of velvet bean in sugarcane

Cited by 5 publications

References 4 publications

Interference Relationships Between Weeds and Sugarcane in the ‘Plene’ System

Interference Relationships Between Weeds and Sugarcane in the ‘Plene’ System

Weed interference in the initial growth of meristem-grown sugarcane plantlets

Physical Properties of Soil and Glyphosate Residue as a Function of Cassava Weed Management by Cover Crops in the Amazon Ecosystem

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