Citation
Dyson J., . and Ngim J., . and Lim J. L., . and Lane M. C. G., . and Klinkong T., . (1999) Long-term ecological safety of paraquat use in tropical soils. [Proceedings Paper]
Abstract
The amount of paraquat that can be in soil without causing effects was measured in tropical soils to determine the long-term ecological safety of paraquat use with respect to soil. The capacity of three mineral soils from Thailand and Malaysia to deactivate paraquat;s biological effects by adsorption was measured using a laboratory assay known as the ;Strong Adsorption Capacity-Wheat Bioassay; SACWB. Subsequently paraquat was applied to field plots at rates below and just above the laboratory measured SAC-WB value by incorporating paraquat down to nominal cultivation depths 15 and 20 cm. The applications of paraquat were equivalent to hundreds of times agronomic application rates so unlikely to occur from normal practice. After application typical local crops were grown in the field plots e.g. cassava maize pineapple peanut and soybean to assess whether residues of paraquat had any effects on crops and earthworms. Soil samples were also taken to determine the paraquat residue levels in soil. The results showed that even the highest residues of paraquat in soil had no statistically significant long tern effects on crops or earthworms demonstrating its ecological safety and suitability for sustainable agriculture.
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Abstract
The amount of paraquat that can be in soil without causing effects was measured in tropical soils to determine the long-term ecological safety of paraquat use with respect to soil. The capacity of three mineral soils from Thailand and Malaysia to deactivate paraquat;s biological effects by adsorption was measured using a laboratory assay known as the ;Strong Adsorption Capacity-Wheat Bioassay; SACWB. Subsequently paraquat was applied to field plots at rates below and just above the laboratory measured SAC-WB value by incorporating paraquat down to nominal cultivation depths 15 and 20 cm. The applications of paraquat were equivalent to hundreds of times agronomic application rates so unlikely to occur from normal practice. After application typical local crops were grown in the field plots e.g. cassava maize pineapple peanut and soybean to assess whether residues of paraquat had any effects on crops and earthworms. Soil samples were also taken to determine the paraquat residue levels in soil. The results showed that even the highest residues of paraquat in soil had no statistically significant long tern effects on crops or earthworms demonstrating its ecological safety and suitability for sustainable agriculture.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. Call number mal SB 950 I61 1999 |
| AGROVOC Term: | Paraquat |
| AGROVOC Term: | Tropical soils |
| AGROVOC Term: | Ecological control |
| AGROVOC Term: | Safety |
| AGROVOC Term: | Sustainable agriculture |
| AGROVOC Term: | Mineral soils |
| AGROVOC Term: | Residues |
| AGROVOC Term: | Cultivation |
| AGROVOC Term: | Bioassays |
| AGROVOC Term: | Crops |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 05:14 |
| URI: | http://webagris.upm.edu.my/id/eprint/12280 |
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