Establishment Principles – Sterile/Barren brome
Avoid disturbing re-inverted weed seeds including those of other species when drilling. Employ the following measures to achieve optimum establishment of the following crop:
(i) Control speed of drilling to minimise upward soil movement.
(ii) Ensure the drill tractor wheel/track slip is minimised by setting tyre pressures and ballast levels optimally. This will limit additional unnecessary surface soil movement when drilling and minimise any adverse effects of trafficking on the seedbed.
(iii) Ensure the ploughed surface is level and well consolidated where the following crop is drilled in quick succession.
(iv) Avoid lifting buried weed seeds and residues to the surface by drill tractor eradicators set too deep, or having too great a boiling effect. Drilling into a firmed surface will help this situation.
(iv) Consider drilling with disc openers or high rake angle tine openers preceded by straight discs to minimise seedbed disturbance, especially in non- plough years.
(v) Use low disturbance banding openers as opposed to those which can raise and disturb soil, including quick-change narrow knife options where following a cereal with a legume or OSR crop.
NOTE: In high levels of residues avoid hair-pinning (especially by multiple disc drills) by using a leading (deeper) disc, side placement of seed relative to the drill slot, or leading residue manager components to clear loose residues away from the seeding zone. Also, preferably leave a higher stubble height to reduce levels of cut residues on the surface being taken into the seeding zone by the opener action.
NOTE: When establishing with minimal disturbance, offset the low levels of mineralisation by zone placement of N with the seed and where appropriate P plus other needed trace elements. Zone fertiliser placement also reduces fertiliser availability to any germinating weed seeds.
NOTE: Drill sufficiently high rates of following crops to compete effectively, Following crops should be sufficiently diverse and competitive for best overall control.