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"In organically farmed cereals, the most frequently used direct weed control methods are mechanical weed control: harrowing and inter-row hoeing. Harrowing can be carried out at three different stages:1. pre-emergence harrowing before the crop emerges,2. early post-emergence harrowing at the early growth stages of the crop until early tillering (in winter wheat this can be carried out in autumn or in spring), and 3. selective harrowing from late tillering until the crop becomes about 40–50 cm high