Influência de chuva simulada após aplicação de herbicidas em pós-emergência, sobre o controle de plantas daninhas, em solo com dois níveis de umidade

Bastiani, Marcos Luiz Rebouças; Silva, Antônio Augusto Moura da; Ferreira, Francisco Affonso; Cardoso, Antônio Américo

doi:10.1590/s0100-83582000000100006

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…The absorption of glyphosate potassium salt formulation is slow and if there is rainfall, it may be washed and this reduces the control of % of these species. The obtained results by several researchers have shown that the absorbtion time of glyphosate in the potassium salt formulation ranges from 4 to 8 h (Bastiani et al, 2000;Jakelaitis et al, 2001;Martini et al, 2003;Werlang et al, 2003;Martins et al, 2009). During evaluation of the size of the stomata, a correlation was verified with the microscopic analysis discussed before (Figure 2) and it was observed that with the passage of time, there was a reduction in the width while the length did not experience any substantial change.…”

Section: Anatomical Studiessupporting

confidence: 55%

Absorption and translocation tolerance of glyphosate

Meschede¹,

Silva²,

Fernandes³

et al. 2015

Afr. J. Agric. Res.

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The purpose of this experiment was to relate the tolerance of Commelina benghalensis to two different kinds of glyphosate formulation, in function of the absorption time and translocation of this molecule in the cells of this plant. The experiment was conducted in a greenhouse. The experimental design is a completely randomized design (CRD), with four treatments follows; glyphosate potassium salt and isopropylamine tested with commercial dosage, haematoxylin dye and a control, with three repetitions. Sample from the leaves, stems and roots were collected and subdivided in twenty-five subsamples. The evaluations were performed by microscopic views every 30 min, until the herbicide was absorbed into the parenchyma of the mesophyll. After 30 min of the application of isopropylamine glyphosate, there was accumulation of this molecule inside leaf apoplast which indicated the process of penetration of isopropylamine glyphosate. For the glyphosate potassium salt the absorption was observed 2 h after application. After 7 h, the presence of a small concentration of the product in the stem was verified. 12 h later, a low concentration was verified in the root. After 36 h the phloem was full of the isopropyl amine salt glyphosate, 86 h later its presence in the xylem and phloem, together with the symptoms of destruction of the parenchyma tissue was visualized. The solution with isopropyl amine salt, after 7 h, was seen in the phloem, with a 12 h concentration of isopropyl amine salt decrease in the stem, which overloaded the phloem of the root. After 86 h, all the parenchyma tissue of the xylem and phloem were destructed. The absorption and translocation of glyphosate depended on its formulation, which represented more or less tolerance of the plant to the herbicide, but tolerance was not the only factor influenced by anatomy, the physiological, biochemical and genetic features were also critical.

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Section: Anatomical Studiessupporting

confidence: 55%

Absorption and translocation tolerance of glyphosate

Meschede¹,

Silva²,

Fernandes³

et al. 2015

Afr. J. Agric. Res.

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“…Em outro estudo da influência da chuva simulada sobre diferentes formulações de nicosulfuron, constatou-se maior eficácia do herbicida, para o controle de Brachiaria plantaginea, quando os intervalos sem chuva foram aumentados de 30 minutos após a aplicação, para plantas mantidas em solo com elevada umidade. Em solo com menor umidade, a eficácia foi muito menor, mesmo quando a chuva ocorreu 120 minutos após a aplicação (BASTIANI et al, 2000). BOVEY et at.…”

Section: Introductionunclassified

Eficácia do herbicida glifosato-potássico submetido à chuva simulada após a aplicação

2003

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Apesar de possuir boa ação herbicida, alguns fatores afetam a eficácia do glifosato e, nesse contexto, realizaram-se estudos buscando formulações mais eficazes. O experimento foi instalado em área do Campus da FCAV-UNESP, Jaboticabal (SP). Testou-se a formulação potássica de glifosato comparada com solução aquosa e grânulos dispersíveis em água à mesma dosagem (0,36 kg.ha-1 e.a) em cinco intervalos (1, 2, 4, 6 e > 48 horas) sem chuva após a aplicação, comparados com uma testemunha sem uso de herbicidas. Foram aplicados em pós-emergência sobre Brachiaria plantaginea, B. decumbens e Digitaria horizontalis. A aplicação foi feita com pulverizador costal a CO2, à pressão de 2,5 kg.cm-2, munido de barra com seis bicos DG 110.02 e consumo de calda equivalente a 200 L.ha-1. Realizaram-se cinco avaliações de porcentagem de controle em relação à testemunha infestada, atribuídas visualmente, até 42 dias após aplicação. Notou-se que o controle da formulação potássica sobre as espécies avaliadas foi mais precoce, necessitando apenas quatro horas após sua aplicação para se igualar ao intervalo superior a 48 horas sem chuva. As demais necessitaram de, no mínimo, seis horas de intervalo.

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“…Moreover, the current evaluation analyzed only the machinery calibration, without any connection with the efficiency of the control, neither evaluated the time of application, which are the most important factors for the operational effectiveness. Bastiani et al (2000) showed in an experiment that control efficiency in advanced plants was not achieved by comparing the application of an herbicide in early stage and late stage weeds. Therefore, the planning of the activities must be up to date, in order not to compromise the quality of the operation besides the proper functioning of the equipment.…”

Section: Herbicidementioning

confidence: 99%