Scenarios and Model Describing Fate and Transport of Pesticides in Surface Water for Danish Conditions
Appendix C
1 Wind Drift
| Wind drift approximation for agricultural crops |
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| Formula | y=exp(ln(B) + bhæld*x-x*A*exp(ahæld*x)) | ||
| X<7.5 m | x>= 7.5 m | ||
| B | 25.70 | 1.619 | |
| A | 2.75 | 0.675 | |
| bhæld | -0.4831 | 0.4708 | |
| ahæld | -0.6020 | -0.00613 | |
| x | distance | ||
| y | Drift, % of dosage | ||
Drift calculated for apples, before and after leaves appear
| Early | |||
| Formula: | |||
| b *exp(ax) | If x<15 | a=-0.127 | b=39 |
| else | a=-0.102 | b=31 | |
| Late Formula b*exp(ax) |
If x<10 | a=-0.1966 | b=28 |
| else | a=-0.0996 | B=11 | |
| x | distance | ||
| y | Drift, % of dosage | ||
Drift calculated for spruce
| For herbicides: | |||
| For soil treatment, weed cover | 0 | ||
| For leaf-treatment, weed cover | 95 | ||
| Dosage: 0.8 ha/ha due to spray tracks left untreated. | |||
For small stages, drift follows the agricultural drift curves. |
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| Drift for insecticide spraying at late stages. |
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| Formula | Vine | a | b |
| y=b*exp(a*log(x)) | Early stages | -3.07 | 29.35 |
| Late stages | -3.56 | 19.66 | |
| The final curve is the average of the two curves specified. | |||
Version 1.0 Maj 2004, © Danish Environmental Protection Agency