Leaching and persistence of selected herbicides used in sugar cane fields in Mauritius
| MSI99P2032 | |
| Umrit, G Ng Kee Kwong, K F | |
| Leaching and persistence of selected herbicides used in sugar cane fields in Mauritius | |
| Periodical article | |
| 1996 | |
| Proc. int. Soc. Sug. Cane Technol. | |
| 22: 124-132 | |
| Abstract published in Sugar Cane 1995 (6): 29 and in International Sugar Journal (Supplement), v. 97 no. 1162 | |
| En | |
| En Fr Es | |
| The leaching potential of atrazine, hexazinone, ioxynil and 2,4-D, (4 herbicides used in sugarcane cultivation in Mauritius) were studied in lysimeters at 2 sites, namely at Réduit (1550 mm rain/year) and Belle Rive (3700 mm rain/year). Their persistence in 3 soils was also studied under laboratory conditions. When the 4 herbicides are used at rates recommended for sugarcane fields, their concentration in soil water draining at 1m depth would not exceed the maximum acceptable limit for drinking nor would they constitute a hazard to aquatic life. The values of their concentrations in the drainage water were within the range of their concentrations noted in soils of temperate countries. Irrespective of soil and climatic conditions, a lag period which may be as long as 80 days invariably occurred before the appearance of the herbicides in soil drainage water. Movement of the herbicides was slower than expected with the peak concentration of hexazinone in drainage water occurring as late as 193 days after its application to soil at Réduit. In general not more than 5 per cent of the herbicides would be lost by leaching over a sugarcane growing season. Under laboratory conditions, the herbicides studied degraded rapidly at first with their half-lives comparable to those which have been found in soils in the temperate environment. Apart from hexazinone (more than 10 per cent of which could still be detected in the soils a year after application), negligible quantity of the herbicides would remain in the soils at the end of the sugarcane growing season. | |
| HERBICIDES LEACHING PERSISTENCE PESTICIDE PERSISTENCE POLLUTION ATRAZINE HEXAZINONE IOXYNIL 2,4-D WATER POLLUTION | |
| MAURITIUS | |
| Pollution | |
| 1995-09-27 | |
| En | |
| LIB | |
| CAT | |
| CHEM |