[Front page][Back ] [Contents] [Printing instructions] |
||||
Report from the Sub-committee on Agriculture |
|
|||
Table 8.10 Table showing relevant non-chemical methods of controlling weeds in important crops. The table expresses typical processes in mechanical weed control and the number of applications (Tersbøl et al., 1998). |
Crop Low and high pressure of weeds |
Blind harrow-ing | Normal harrow-ing | Selective harrow-ing | Inter-row culti-vation | Hoe-ing | Gas-burn-ing | Hand- hoe- ing |
Number of applications, total |
Control effect, % | Import-ance of quality of seed bed | Yield loss compared with chemical control |
Spring cereals, low | 0-1 | (1) | 1 | (0-2) | 70-95 | *** | 0-5% | ||||
Spring cereals, high | 1 | 1-2 | 1 | 2-3 | 50-80 | *** | 5-15% | ||||
Winter cereals, low | 0-1 | 2-3 | 0-2 | >70 | ** | 0-5% 1) | |||||
Winter cereals, high | 1 | (1) | 3-4 | 40-70 | ** | 0-10% 1) | |||||
Field peas | 1 | 2-3 | 3-4 | 80-95 | *** | 5-15% | |||||
Maize | 1 | 2 | 1-2 | 2 | 2 | (1) | 8 | 70 | *** | 10-20% | |
Winter rape | (1) | (1) | 2-3 | 2-4 | ? | ** | 0% | ||||
Beets | (1-2) | 3 | (1) | 1-2 | 3 | 95-100 | ** | 0% | |||
Potatoes | 1-3 | 3 | 4-6 | 90-100 | * | 0% |
Figures give number of applications | ( ) indicates possible treatment |
***Indicates great importance | 1) yield loss due to late sowing not included |
**Indicates importance | |
*Indicates slight importance |