Phytosociology of Weeds in Cultivation of Two Varieties of Cassava1

Miléo, L.J.; Silva, J.F.; Albertino, Sônia Maria Figueiredo; Leite, Bruna Nogueira; Menezes, Dimas; Santos, Aldenir Feitosa dos

doi:10.1590/s0100-83582016340200008

Cited by 6 publications

(8 citation statements)

References 11 publications

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“…In relation to class, a predominance of dicotyledons occurred, with 63.64% of the total identified plants, comprising 14 species and represented by eight families, while two families and eight species represented the monocotyledons (36.36%). These results agree with other researches in the Amazonian agrosystem, where a greater numbers of species belonging to dicotyledons have also been recorded (Albertino et al, 2004;Miléo et al, 2016). Even though the monocotyledons represent a lower percentage of species in the composition of the weed community, their individuals number was higher (Table 1).…”

Section: Resultssupporting

confidence: 92%

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Phytosociology and cover analysis in the suppression of weeds from an Amazonian agrosystem

Gama

Leite

Pinheiro

et al. 2020

Agraria

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Weeds can occur in cultivated areas, competing with crops and causing considerable losses. Herbicides are the basis of weed control; however, they are questionable due to their possible negative impacts on human health and the environment. An alternative for controlling weeds is using cover plants. This study aimed to determine the floristic composition of weeds in an Amazonian agrosystem with cover plants and to evaluate the production of biomass, the soil cover rate and the weed suppression potential of cover plants. The experimental design was in randomized blocks, in a 4 x 2 factorial scheme. The factors under study were the cover species (Brachiaria ruziziensis, Canavalia ensiformis, Mucuna deeringiana) and the control group that consisted of weeds, evaluated during two agricultural years (2017 and 2018), with four replicates. Digitaria horizontalis was the most important weed species and was completely suppressed by B. ruziziensis. This cover type had a large production of biomass, greater coverage of the soil and high suppression of weeds in the Amazonian agrosystem.

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Section: Resultssupporting

confidence: 92%

“…In Amazonian agrosystems, the diversity of weed species in agricultural cultivations is high and may present different forms of propagation and dispersion (Albertino et al, 2004;Miléo et al, 2016). Pinpointing the infestation community in the crop is the first step in adopting the management.…”

Section: Introductionmentioning

confidence: 99%

Phytosociology and cover analysis in the suppression of weeds from an Amazonian agrosystem

Gama

Leite

Pinheiro

et al. 2020

Agraria

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“…The Poaceae family was the most representative, with five species, followed by Cyperaceae, Fabaceae, and Verbenaceae families, each one with two species (Table 1). The importance of the Poaceae family for crops grown in the country has already been observed in other studies involving weed plants in crops in the Amazon region, e.g., Fontes et al [17], Da Gama et al [18], Damasceno [19], De Almeida et al [20], Dos Santos [21], Miléo et al [22], and Albertino et al [23].…”

Section: Phytosociological Parameters Of Weedsmentioning

confidence: 54%

Chemical Properties of Soil and Cassava Yield as a Function of Weed Management by Cover Crops in the Amazon Ecosystem

et al. 2022

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Cassava (Manihot esculenta) yields are severely affected by the interference of weed plants. Using cover crops for weed control appears as a sustainable alternative practice because it maintains the soil covered and reduces the need for herbicides. The aim of this study was to assess cassava crop yields and the soil chemical properties as a function of use of cover crops for weed management. Treatments were three cover crops (Brachiaria ruziziensis, Canavalia ensiformis, and Mucuna pruriens), chemical control, mechanical control, and treatment with no weed control. Cover crops reduced the diversity of species and the quantity of individuals of the weed community in cassava cultivation. The treatments with chemical and physical weed control achieved higher yields. The cover crops B. ruziziensis and C. ensiformis increased cassava yields by 30% and 14%, respectively, when compared with the treatment with no control. The cover crops increased the pH, MO, K, Ca, and Mg values when compared with the treatments with chemical and mechanical weed control. Brachiaria ruziziensis and C. ensiformis are recommended as a cover plants in cassava production systems in the Amazon region. The use of cover crops associated with cassava is a sustainable management option because, in addition to the suppressive effect on weeds, cover crops improve the chemical properties of soil, which may contribute to increasing cassava production in the long term.

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“…Shrubby false buttonweed is one of the most frequent weed species in the Amazon, with high capacity to interfere negatively in several crops by competing for nutrients (Fontes and Tonato, 2016;Miléo et al, 2016). The effects on hypocotyl alongation were pronounced and the highest amounts of straw, 50 and 25 mg, promoted a decrease of 70.0 and 27.0%, respectively, in the hypocotyl length of the seedlings in relation to the amount of 10 mg of straw.…”

Section: Resultsmentioning

confidence: 99%

“…Among weeds of great economic importance in the Americas, the shrubby false buttonweed (Spermacoce verticillata L.) stands out as one of the species with high frequency in native pasture areas and in grain production areas in no-tillage system (Lorenzi, 2008). It is a species with high capacity to generate infestations in arable areas and difficult to control, even with using herbicides (Miléo et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Allelopathic potential of Cover Crops in Control of Shrubby False Buttonweed (Spermacoce verticillata)

2018

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potential of cover crops in control of shrubby false buttonweed ... ABSTRACT -Searching for alternatives to deal with weeds without the exclusive use of herbicides can increase the sustainability of agricultural production in the Amazon region. This study aimed to evaluate the allelopathic potential of cover crops on the weed shrubby false buttonweed (Spermacoce verticillata L.). Three straw levels (1; 2.5 and 5 mg cm -2 ) of thirteen cover crops (Cajanus cajan, Canavalia ensiformis, Crotalaria juncea, C. ochroleuca, C. spectabilis, Mucuna aterrima, M. cinereum, Pennisetum glaucum, Sorghum bicolor, S. sudanense, Urochloa brizanha cv. Xaraés, U. brizantha cv. Piatã and U. ruziziensis) were assessed on germination and initial growth of weed and lettuce. We carried out two experiments (weed and lettuce) in a factorial scheme (cover crops x straw levels) with additional treatment (control without straw) in a completely randomized experimental design, with four replicates. The straw of the cover crops inhibited the germination and initial growth of the target plants. The highest straw levels promoted 44.0 and 78.8% reductions in radicle length in relation to the lowest dose (1 mg cm -2 ), for lettuce and Spermacoce verticillata, respectively. The highest sensitivity to allelochemicals occurred on the radicle. The major suppressive effects on weed germination were promoted by Cajanus cajan, Urochloa brizanha cv. Xaraés, Mucuna cinereum, M. aterrima, Canavalia ensiformis, Crotalaria juncea, C. spectabilis and U. ruziziensis. Cover crops use is an integrated practice management to control Spermacoce verticillata under no-tillage system.RESUMO -A busca por alternativas no manejo de plantas daninhas sem a utilização exclusiva de herbicidas pode contribuir para aumento da sustentabilidade na produção agrícola na região Amazônica. Objetivou-se neste estudo avaliar o potencial alelopático de plantas de cobertura, sobre a planta daninha vassourinhade-botão (Spermacoce verticillata L.). Três níveis de palhada (1; 2,5 e 5 mg cm -2 ) de treze plantas de cobertura (Cajanus cajan, Canavalia ensiformis, Crotalaria juncea, C. ochroleuca, C. spectabilis, Mucuna aterrima, M. cinereum, Pennisetum glaucum, Sorghum bicolor, S. sudanense, Urochloa brizanha cv. Xaraés, U. brizantha cv. Piatã e U. ruziziensis) foram avaliados, sobre a germinação e o crescimento inicial da planta daninha e da alface. Dois experimentos foram instalados (planta daninha e alface) em esquema fatorial (plantas de cobertura x níveis de palhada) com tratamento adicional (testemunha sem palhada) em delineamento experimental inteiramente casualizado, com quatro repetições. As palhadas das plantas de cobertura inibiram a germinação e o crescimento inicial potential of cover crops in control of shrubby false buttonweed ... 2 das plantas alvo. Os maiores níveis de palhada promoveram reduções de 44,0 e 78,8% no comprimento da radícula em relação à menor dose (1 mg cm -2 ), para a alface e para a vassourinha-de-botão, respectivamente. A maior sensibilidade aos aleloq...

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Phytosociology of Weeds in Cultivation of Two Varieties of Cassava1

Cited by 6 publications

References 11 publications

Phytosociology and cover analysis in the suppression of weeds from an Amazonian agrosystem

Phytosociology and cover analysis in the suppression of weeds from an Amazonian agrosystem

Chemical Properties of Soil and Cassava Yield as a Function of Weed Management by Cover Crops in the Amazon Ecosystem

Allelopathic potential of Cover Crops in Control of Shrubby False Buttonweed (Spermacoce verticillata)

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