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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