Weed control strip influences the initial growth of Eucalyptus grandis

Silva, João Renato Vaz da; Alves, Pedro Luís da Costa Aguiar; Toledo, Roberto

doi:10.4025/actasciagron.v34i1.12252

Cited by 8 publications

(10 citation statements)

References 10 publications

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“…Identification of the understory species is important to define the proper control approach (Silva et al, 2012). However, monochromatic remote sensing, such as airborne laser scanning, is not ideal for species differentiation.…”

Section: Discussionmentioning

confidence: 99%

“…Understory control is usually applied during the early stages of the forest to improve the establishment of trees, ensuring full access to growth factors (Kogan et al, 2002;Liechty and Fristoe, 2013;Vargas et al, 2018;Zhou et al, 2018). The most common practices to control understory development in forest plantations are hoeing and herbicides application (Silva et al, 2012;Toledo et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Monitoring the understory in eucalyptus plantations using airborne laser scanning

Melo

Reis

Martins³

et al. 2021

Sci. agric. (Piracicaba, Braz.)

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In eucalyptus plantations, the presence of understory increases the risk of fires, acts as an obstacle to forest operations, and leads to yield losses due to competition. The objective of this study was to develop an approach to discriminate the presence or absence of understory in eucalyptus plantations based on airborne laser scanning surveys. The bimodal canopy height profile was modeled by two Weibull density functions: one to model the canopy, and other to model the understory. The parameters used as predictor in the logistic model successfully discriminated the presence or absence of understory. The logistic model composed by g canopy , g understory , and g understory showed higher values of accuracy (0.96) and kappa (0.92), which means an adequate classification of presence of understory and absence of understory. Weibull parameters could be used as input in the logistic regression to effectively identify the presence and absence of understory in eucalyptus plantation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Monitoring the understory in eucalyptus plantations using airborne laser scanning

Melo

Reis

Martins³

et al. 2021

Sci. agric. (Piracicaba, Braz.)

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“…In this way, weed interference (resulted of the weed competition for light, CO 2 , water, nutrients, and space as well as of the allelopathic effects of some weed species) is an important issue reducing plant growth and, in consequence, increasing the timing for plant maturity [5] [6]. Weed management during the establishment of commercial tree plantations is a major factor that contributes to improvement of the final yield [7]- [9]. Development of a sound vegetation management strategy requires a definite and sequential plan of action [9].…”

Section: Introductionmentioning

confidence: 99%

“…Weed management during the establishment of commercial tree plantations is a major factor that contributes to improvement of the final yield [7]- [9]. Development of a sound vegetation management strategy requires a definite and sequential plan of action [9]. A good understanding of the basic criteria involved in weed-tree interactions, growth-limiting factors, the minimum tolerable weed thresholds and an understanding of the best parameters of measurement are needed to delineate an appropriate management approach [10].…”

Section: Introductionmentioning

confidence: 99%

Weed Control Strips Influences on the Rubber Tree Growth

Guzzo¹,

Carvalho²,

Alves³

et al. 2014

AJPS

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Hevea brasiliensis (rubber tree) is the most widely cultivated tree species for producing natural rubber latex whose productivity can be reduced by weeds. Field experiment was carried out during two years to evaluate the growth of rubber tree plants submitted to different weed control strips (0-weed-free, 50, 100, 150, 200, 250, 300, 350, and 400-(weedy cm) and to determine the critical width of weed control strip during the establishment of rubber tree plantation. Weed community was composed mainly by Urochloa decumbens (90%). The width of the weed control strip influenced on the initial plant growth of rubber trees, reducing the plant height, stem diameter, leaf area, and aboveground dry mass accumulation. In consequence, crop plantation was affected by the width of weed control. The critical width of the weed control strip for establishment of a rubber tree plantation was within 100 cm.

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“…Weeds are a major problem in eucalypt, and can cause yield reduction and increase production costs due to high demand for manpower expended in weed control Silva et al, 2012). Invasive species are usually found in eucalypt areas as early as preparing the soil for planting and in absence of proper management can remain until harvest.…”

Section: Introductionmentioning

confidence: 99%

Herbicides for weed control in eucalypt

Pereira

Alves²

2015

RBHerbicidas

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-To ensure the maximum forestry productivity the adoption of efficient managements is essential. Weed control is very important, since presence of weeds can lead to competition for key factors to plant development. Weed interference can cause losses of up to 50 % in productivity and over 90 % of reduction in the profitability of forestry areas. Chemical control is widely used in weed management and about 30 % of the total costs of production and up to 50 % of the work force used in eucalypt crop cycle are intended for this purpose. Brazilian forestry sector has great economic expressiveness, but there are few herbicides registered. Chemical weed control should still fit the standards required by eucalypt certifications. The expansion of sector and the economic importance of this crop in Brazil make necessary the development of new herbicides and new spraying techniques to increase herbicides efficiency, new research, as well as encouraging adoption of an integrated weed management plan in eucalypt. Keywords: Eucalyptus; glyphosate; reforestation; weed competition; weed management Resumo -Para garantir a máxima produtividade florestal, a adoção de um manejo eficiente é essencial. O controle de plantas daninhas é muito importante, já que a presença dessas pode ocasionar competição por fatores fundamentais ao desenvolvimento das plantas. A interferência das plantas daninhas pode ocasionar perdas de até 50 % na produtividade e mais de 90 % de redução na rentabilidade das áreas florestais. O controle químico é amplamente utilizado no manejo das plantas daninhas, e cerca de 30 % dos custos totais de produção e mais de 50 % da mão-de-obra utilizada na cultura do eucalipto são destinadas para esse propósito. O setor florestal tem uma grande expressividade econômica, mas poucos herbicidas são registrados. O controle químico ainda deve se encaixar aos padrões requeridos pelas certificadoras. A expansão do setor e a importância econômica do eucalipto no Brasil fazem necessário o desenvolvimento de novos herbicidas, novas tecnologias de aplicação, novas pesquisas, bem como a adoção de um plano de manejo integrado de plantas daninhas em eucalipto.

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Weed control strip influences the initial growth of Eucalyptus grandis

Cited by 8 publications

References 10 publications

Monitoring the understory in eucalyptus plantations using airborne laser scanning

Monitoring the understory in eucalyptus plantations using airborne laser scanning

Weed Control Strips Influences on the Rubber Tree Growth

Herbicides for weed control in eucalypt

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