Influence of water stress and surfactant on the efficacy, absorption and translocation of glyphosate
| Autor: | H. de Ruiter, E. Meinen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1998 |
| Předmět: |
0106 biological sciences
Polyethylene glycol Climate Chromosomal translocation Plant Science Absorption (skin) 01 natural sciences Agrobiology chemistry.chemical_compound Animal science Pulmonary surfactant PEG ratio Research Institute for Agrobiology and Soil Fertility SOLNI Instituut voor Agrobiologisch en Bodemvruchtbaarheidsonderzoek 04 agricultural and veterinary sciences 010602 entomology Agronomy chemistry Glyphosate 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Soil fertility Agronomy and Crop Science |
| Zdroj: | Weed Science 46 (1998) 3 |
| ISSN: | 0043-1745 |
| DOI: | 10.1017/s0043174500089438 |
| Popis: | Esther Meinen DLO Research Institute for Agrobiology and Soil Fertility, P.O. Box 14, 6700 AA Wageningen, The Netherlands Black nightshade was subjected to two degrees of water stress by adding polyethylene glycol 20,000 (PEG) to the nutrient solution 5 d before treatment with glyphosate. The ED50 values for glyphosate, determined from dose-response curves, demonstrated that both degrees of water stress strongly increased the ED50, with and without the surfactant Ethomeen T/25 in the spray solution. The surfactant reduced the ED50 5-, 4.6-, and 6.9-fold at 0, 15, and 20% PEG, respectively. A 14C study demonstrated that unstressed plants absorbed 22% of applied glyphosate. Without surfactant, water stress reduced foliar absorption 2.2-fold at 15% PEG and 4.5-fold at 20% PEG. With surfactant, the foliar absorption was 35% of the applied amount in unstressed and water-stressed plants. The surfactant and PEG reduced the translocation efficiency of glyphosate. The surfactant had the most pronounced influence and reduced the translocation efficiency 1.5-fold at 0% PEG, 2.2-fold at 15% PEG, and 1.8-fold at 20% PEG. Induction or removal of water stress 24 h after glyphosate treatment indicated that plant growth rate is positively correlated with glyphosate efficacy. It was concluded that the surfactant can overcome the adverse influence of water stress on foliar absorption of glyphosate but not the adverse, postapplication influence of water stress on glyphosate efficacy. |
| Databáze: | OpenAIRE |
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