The activity of triallate is influenced by both soil temperature and soil moisture. As a result, Fortress gives excellent control of most germinating weeds. Granules should be applied as far in advance of seeding as is possible to allow activation of the active ingredient. Try to maintain good crop residue cover to preserve soil moisture. Trash management Granules must be able to fall through crop residue and contact the soil surface.
Good activity requires contact between the granule and the soil particles.
Fortress granules can generally be applied to soils with a 75 per cent residue cover, or up to 90 per cent if the straw and chaff are uniformly spread. If you can seed through existing stubble and crop residue, then you can apply Fortress and expect good results. The active ingredient of Fortress is tied up by soil organic matter. As a result, soils with higher organic matter levels require higher rates of Fortress. In addition, some crops are not as competitive with wild oats and wild millet and since they are also more tolerant to Fortress, a higher rate will give a better level of control in these crops.