Interference of seeding and regrowth of signalgrass weed (Urochloa decumbens) during the initial development of Eucalyptus urograndis (E. grandis × E. urophylla)

Bacha, Allan Lopes; Pereira, Fernanda Campos Mastrotti; Pires, Rodrigo Neto; Nepomuceno, Mariluce Pascoína; Alves, Pedro Luís da Costa Aguiar

doi:10.21475/ajcs.2016.10.03.p6995

Cited by 15 publications

(16 citation statements)

References 18 publications

(15 reference statements)

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“…Similar results were reported for interference of U. decumbens on E. grandis (Toledo et al, 2001). Bacha et al (2016) observed that regrowth of signal grass at a density of 2.6 plants m -2 caused reduced growth in leaf area and dry biomass of E. urograndis up to 89% and 87%, respectively.…”

Section: Discussionmentioning

confidence: 97%

“…Their fast root growth enables them to better exploit environment resources and makes them very aggressive, especially during regrowth (Bacha et al, 2016), which enables rapid colonization of an area (Toledo et al, 1996).…”

Section: Discussionmentioning

confidence: 99%

“…On the other side, the weed interference is one of the most important factors compromising forest productivity in eucalyptus plantations worldwide and has been studied over the past few decades (Sands and Nambiar, 1984;Ellis et al, 1985;Caldwell et al, 1995;Adams et al, 2003;Schaller et al, 2003;Coll et al, 2004;Garau et al, 2008;Cruz et al, 2010;Marques et al, 2015;Bacha et al, 2016). In addition to competing with crops for light, water and nutrients, the weed community also releases allelopathic compounds into the environment, which may interfere in eucalyptus growth (Pitelli, 1987;Brendolan et al, 2000;Toledo et al, 2001;Watt et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Interference of Urochloa decumbens and Panicum maximum in the initial growth of six clones of Eucalyptus urograndis

Colmanetti¹,

Bacha²,

Braga³

et al. 2017

Aust J Crop Sci

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Weeds play a strong pressure on the eucalyptus early growth, leading to a delay in their development. Therefore, many studies have tried to identify eucalyptus clones that are more tolerant to weed competition to supply information to producers, genetic improvement programs and the scientific community. The objective of this study was evaluate the interference of signal grass (Urochloa decumbens) and guinea grass (Panicum maximum) in the early growth of six clones of Eucalyptus urograndis, as well as the reciprocal effect. The experiment was conducted in an open and semi-controlled area in 8-L pots using a completely randomized experimental design with a 3 x 6 factorial scheme (U. decumbens, P. maximum and weed-free control and six eucalyptus clones). After ninety days of planting, the following variables were measured: eucalyptus stem diameter, height, total chlorophyll concentration, chlorophyll fluorescence (Fv/Fm), net assimilation rate and eucalyptus and weed dry biomass. In coexistence with Guinea grass (Panicum maximum), clone 3 (ms 709 H) exhibited a 78.2% reduction in dry biomass compared to clone 4 (C 219 H), which obtained the highest dry biomass. In coexistence with signal grass (Urochloa decumbens), clone 6 (ms 686 H) was the most negatively affected by weed competition, with an 80.7% lower dry biomass than clone 4. In general, clones 1 (ms 710 H), 2 (H 1069) and 4 were more resistant, and clones 3 and 6 were more sensitive to weed interference. Both weeds were affected by eucalyptus, but Guinea grass was more sensitive than signal grass.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interference of Urochloa decumbens and Panicum maximum in the initial growth of six clones of Eucalyptus urograndis

Colmanetti¹,

Bacha²,

Braga³

et al. 2017

Aust J Crop Sci

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“…Although, we did not aim at assessing the forage production (U. brizantha) as a function of sowing density, period of coexistence and distance of trees, studies with these objectives are recommended, since the competition with the trees can significantly reduce the production and the nutritional quality of the forage (Cabral et al, 2017), especially in crops with higher density of forage plants (Bacha, Pereira, Pires, Nepomuceno, & Alves, 2016;Pereira, Souza, Silva, & Martins, 2011).…”

Section: Figurementioning

confidence: 99%

Growth and Structural Development of Tectona grandis in Different Cultivation Systems in Brazil

Medeiros¹,

Domiciano²,

Leseux³

et al. 2019

JAS

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The objective of the research was to assess the growth and structural changes of clonal and seed-origin teak trees in monoculture and agroforestry systems. The experiment was established in a randomized complete block design with six replicates. Eight treatments were etablished consisting of combinations of two propagation types (clonal and seed-origin), two types of cultivation systems until the age of 24 months (monoculture and taungya system with maize) and two types of cultivation system after 24 months of age (monoculture and silvopastoral systems). The data were analyzed by modeling the growth and yield, diameter distribution and diameter class ingrowth. The technical age of thinning was then determined by the percent entries method. Independent of the cultivation system, clonal trees presented greater tree height and diameter than seed-origin trees. Regarding the cultivation systems, systems ending in a monoculture phase presented greater tree height and diameter than systems ending in a silvopastoral phase. In terms of structure, represented by the evolution of diameter distribution, seed-origin trees and systems ending in a silvopastural phase resulted in flatter and broader distributions than clonal trees and final monoculture phase. Overall, the technical age of the first thinning varied from 6 to 9 years, being earlier for clonal trees in monoculture and later for seed-origin trees in systems ending in a silvopastoral phase. The slower growth and greater variability in silvopastoral systems with seed-origin teak tree can be attributed to the genetic variability of the trees associated competition with the brachiaria grass, which also made the plants more susceptible to the attack of pests.

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“…Bacha, Pereira, Pires, Nepomuceno, and Alves (2016) reported that low density (3 plants m -2 ) of U. decumbens in the regrowth stage caused a reduction on the initial growth of eucalyptus up to 87% of total dry matter and 90% on leaf area. These results corroborate with Toledo, Victória Filho, Pitelli, Alves, and Lopes (2000), which found that eucalyptus plants cultivated for one year in coexistence with weeds show reductions of 71% on plant diameter and 68% on height, indicating the negative interference in the initial development when there is no proper weed management.…”

Section: Introductionmentioning

confidence: 99%

Weed Control and Selectivity to Post-Applied Herbicides in Eucalyptus

Bacha¹,

Nepomuceno²,

Carrega³

et al. 2017

JAS

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The objective of this study was to evaluate the selectivity of fluazifop-p-butyl and haloxyfop-R methyl ester on Eucalyptus urograndis (clone GG100), as well as the use of fluazifop-p-butyl for control of Panicum maximum and Urochloa brizantha. Two experiments were conducted in 15-liter capacity pots, in a completely randomized design with four replications. The first experiment consisted of seven treatments, in which fluazifop-p-butyl and haloxyfop-R methyl ester were sprayed at 15, 30 and 37 days after planting (DAP) and a control plot without application. In the second experiment, the treatments consisted of a factorial 4 × 2 (four application periods and two weed species), in which three seedlings of P. maximum or U. brizantha were transplanted per pot. In both experiments, at 90 DAP, plant height, stem diameter, leaf area and total dry matter of eucalyptus were evaluated. In the second experiment, besides the morphological parameters, the percentage of weed control was evaluated. The data was submitted to analysis of variance by F test, and the means compared by Tukey test at the level of 5% of probability. Both herbicides did not cause visual effects of phytointoxication in eucalyptus, but haloxyfop-R methyl ester was not selective to clone GG100 (E. urograndis). Fluazifop-p-butyl was selective to clone GG100, providing better control in the first application period (15 DAP) but only for P. maximum, which negatively affected the initial development of eucalyptus, while U. brizantha was not efficiently controlled with the usage of fluazifop-p-butyl.

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Interference of seeding and regrowth of signalgrass weed (Urochloa decumbens) during the initial development of Eucalyptus urograndis (E. grandis × E. urophylla)

Cited by 15 publications

References 18 publications

Interference of Urochloa decumbens and Panicum maximum in the initial growth of six clones of Eucalyptus urograndis

Interference of Urochloa decumbens and Panicum maximum in the initial growth of six clones of Eucalyptus urograndis

Growth and Structural Development of Tectona grandis in Different Cultivation Systems in Brazil

Weed Control and Selectivity to Post-Applied Herbicides in Eucalyptus

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