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

Martini, Gustavo; Pedrinho, Aimar Francisco Ferrari; Durigan, Júlio Cézar

doi:10.1590/s0006-87052003000100005

Cited by 11 publications

(6 citation statements)

References 11 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: 54%

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: 54%

Absorption and translocation tolerance of glyphosate

Meschede¹,

Silva²,

Fernandes³

et al. 2015

Afr. J. Agric. Res.

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“…Jakelaitis et al (2003), avaliando diferentes formulações de glyphosate em condições de chuva, constatou-se que com uma hora depois da aplicação com chuva o ZQ proporcionou o melhor controle na espécie estuda, levando-nos a afirmar que sua absorção é mais rápida que de outras formulações, constituindo a uma dessecação mais rápida. O mesmo aconteceu em trabalho realizado por Martini et al (2003), na aplicação de glyphosate potássico em Brachiaria plantaginea, Brachiaria decumbens e Digitaria horizontalis, onde a incidência de chuva uma horas após a aplicação, a média de controle foi de 40% aos 14 dias após o tratamento, e atingiu 65% em 28 dias, sobressaindo em relação às demais formulações.…”

Section: Resultsunclassified

“…Já aos 8 DAD, a aveia-preta apresentou o maior controle diferindo significativamente dos demais tratamentos para os dois produtos utilizados, onde novamente os piores índices de eficiência foi com a espécie ervilhaca, para ambos os herbicidas. Segundo Martini et al (2003), os melhores resultados e controle aparecem de forma mais evidente em algumas espécies, devido a maior suscetibilidade das espécies a molécula de glyphosate.…”

Section: Resultsunclassified

Dessecação de espécies de cobertura do solo com formulações de glyphosate

Krenchinski

Albrecht

Krenchinski³

et al. 2013

RBHerbicidas

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O manejo das espécies de cobertura pode ser realizado por métodos mecânicos ou químicos. No método químico são utilizados herbicidas não seletivos principalmente do grupo do glyphosate. O objetivo do presente trabalho foi avaliar a fitotoxicidade e a eficiência agronômica de duas formulações com princípio ativo glyphosate na dessecação em espécies de cobertura do solo. O presente trabalho foi conduzido no campo no município de Marechal Cândido Rondon/PR. O delineamento experimental foi de blocos ao acaso com quatro repetições com esquema fatorial de 2x5 (formulações x espécies), no qual as espécies constituíram-se de aveia-branca, aveia-preta, azevém, ervilhaca e nabo-forrageiro, dessecados por dois herbicidas: Zapp QI® (ZQ) e Glyphosate 480 Agripec® (GA). Foram avaliados fitotoxicidade e eficiência agronômica das espécies de cobertura. Zapp Qi® proporcionou maior fitotoxicidade e eficiência agronômica nas espécies de cobertura em relação ao Glyphosate 480 Agripec®. O Zapp Qi® aos 32 dias após a dessecação apresentou os maiores valores de eficiência agronômica. A única espécie que apresentou 100% de eficiência agronômica foi o nabo-forrageiro.

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“…Smith et al (2016) stated that it is important to understand which irrigation rates are most appropriate for herbicide incorporation to optimize weed management programs. The amount and intensity of the rainfall can influence the rate of absorption and translocation of the herbicides, as well as the efficiency of the weed control (Martini et al 2003;Monquero & Silva 2007). This study aimed to evaluate effects of imazethapyr placement on its phytotoxic activity against selected weeds and to determine whether the phytotoxicity of imazethapyr in combination with OPF mulches could be influenced by rainfall amount.…”

Section: Introductionmentioning

confidence: 99%

Different Imazethapyr Placements and Rainfall Amounts Affect Phytotoxic Activity of Imazethapyr in Combination with Oil Palm Frond Residue Mulches against Common Weeds in Landscapes

Nordin¹,

Dilipkumar²,

Chuah³

2019

JSM

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A combination of oil palm frond (OPF) mulch and imazathapyr has been shown to provide great inhibition of weed but its phytotoxicity may be influenced by imazethapyr placement on the OPF mulch and rainfall amount. This study aimed to evaluate effects of herbicide placement and rainfall amount on the phytotoxic activity of imazethapyr in combination with OPF mulches against goosegrass, slender cyperus and coat buttons under glasshouse conditions. Imazethapyr was applied at 10.4 g a.i. ha -1 to under or above or as a pretreatment on the OPF mulch residue powder (< 2 mm) at 3.5 t ha -1 . Imazethapyr placement did not influence its inhibitory effects against weed emergence. Both pretreated mulches and imazethapyr applied under the mulches had comparable inhibition of seedling growth for goosegrass and slender cyperus. However, the pretreated mulches gave better seedling growth inhibition of both bioassay species as compared to those of imazethapyr that applied above mulches. Coat button was highly inhibited regardless of any imazethapyr placements. An increase in rainfall amount from 150 to 450 mm could increase the seedling emergence of goosegrass and slender cyperus from 30 to 80% when subjected to pretreated mulches. However, different rainfall amounts had no significant effect on coat buttons seedling emergence. The pretreated mulches could reduce weed seedling growth by 75 to 80% without being affected by the rainfall amounts. The present results suggested that phytotoxic activity of imazethapyr in combination with OPF residue mulches is dependent on imazethapyr placement, rainfall amount and weed species. ABSTRAKKombinasi antara sungkupan pelepah kelapa sawit (PKS) dan imazetapir telah menunjukkan perencatan rumpai yang baik tetapi kefitotoksikannya mungkin dipengaruhi oleh penempatan imazetapir pada PKS dan kuantiti hujan. Kajian ini bertujuan untuk menilai kesan penempatan racun rumpai dan kuantiti hujan terhadap aktivit kefitotoksikan kombinasi imazetapir dengan sungkupan PKS terhadap rumput sambau, rumput wangi dan kancing baju di bawah keadaan rumah kaca. Imazetapir pada 10.4 g a.i. ha -1 ditempatkan sama ada di bawah atau di atas atau sebagai pra-rawatan pada serbuk sungkupan PKS (< 2 mm) pada 3.5 t ha -1 . Penempatan imazetapir tidak mempengaruhi keberkesanannya terhadap perencatan kemunculan rumpai. Pra-rawatan sungkupan dan imazetapir yang disembur di bawah sungkupan mempunyai perencatan yang setanding terhadap pertumbuhan anak benih rumput sambau dan rumput wangi. Walau bagaimanapun, pra-rawatan sungkupan memberi perencatan yang lebik baik terhadap pertumbuhan kedua-dua spesies bioasai berbanding dengan yang disembur di atas sungkupan. Kancing baju mempunyai perencatan yang tinggi tanpa mengira sebarang penempatan imazetapir. Peningkatan kuantiti hujan daripada 150 hingga 450 mm dapat meningkatkan kemunculan anak benih rumput sambau dan rumput wangi daripada 30 hingga 80% apabila diperlakukan dengan pra-rawatan sungkupan. Walau bagaimanapun, kuantiti hujan yang berbeza tidak memberi kesan yang bererti...

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

Cited by 11 publications

References 11 publications

Absorption and translocation tolerance of glyphosate

Absorption and translocation tolerance of glyphosate

Dessecação de espécies de cobertura do solo com formulações de glyphosate

Different Imazethapyr Placements and Rainfall Amounts Affect Phytotoxic Activity of Imazethapyr in Combination with Oil Palm Frond Residue Mulches against Common Weeds in Landscapes

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