Inter-row cultivation for mechanical weed control in winter oilseed rape WP2, Innovative IPM solutions for winter wheat based rotations.

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Presentation transcript:

Inter-row cultivation for mechanical weed control in winter oilseed rape WP2, Innovative IPM solutions for winter wheat based rotations

Non-chemical weed management tactics are important for implementing the intentions of IPM crop protection programmes in arable crops Mechanical weed control methods lead to less reliance on herbicides and reduce adverse side- effects from herbicide use Inter-row cultivation has shown promise for non- chemical weed control in winter oilseed rape Motivations for employing mechanical weed control

Principal weed species causing problems in winter oilseed rape in Northern Europe Poa annua Stellaria media Veronica persica Papaver rhoeas Tripleurospermum perforatumThlaspi arvense Capsella bursa-pastoris Sinapis arvensis Lamium purpureum Volunteer cereals

Inter-row cultivation requires increased row spacing, preferably 50 cm Normal row spacing 12.5 cm. (14 October 2011)Increased row spacing 50 cm. (14 October 2011) Inter-row hoeing in April 2014

The implement for inter-row cultivation Inter-row hoeing in Septemper at an early crop growth stage (oilseed rape with 2-3 true leaves) Inter-row hoeing in late April using a front-mounted hoe for manual steering Videoclip of inter-row hoeing in September in the PURE-experiment at Flakkebjerg

Links to examples of inter-row hoes relevant for inter-row cultivation in winter oilseed rape Inter-row cultivators with goosefoot shares (blades) including examples of camera-based automatic steering systems: d=1591&Itemid=665&lang=en

Weeding strategy for inter-row cultivation in winter oilseed rape Early autumn, first pass at the 2-4 true leaves stage - mandatory. Use protective discs to avoid covering the crop with soil Mid-autumn, second pass if necessary. Protective discs may be removed to allow for slight ridging of the crop to suppress intra-row weeds Early spring, a third pass might be necessary in case of high weed pressure and mild winters. No need for protective discs

Vulnerability of weeds to hoeing at different weed growth stages Easy to control, very limited regrowth Regrowth may take place under wet weather conditions after treatment Stellaria media Tripleurospermum perforatum Capsella bursa- pastoris

High pressure from competitive intra-row weeds may require chemical weed control Weedy crop rows can result in yield losses and considrable weed seed shedding – especially volunteer cereals,Tripleurospermum perforatum and Papaver rhoeas can be problematic Use band-spraying for the control of intra-row weeds in order to minimise herbicide input Nice and clean crop rows

Conclusion Inter-row cultivation for mechanical weed control is an important IPM-tool for winter oilseed rape and can in many case provide sufficient weed control. Supplementary intra-row control with herbicides may be required where competitive weeds and volounteers with an erect growth habit occur in high numbers Inter-row cultivated oilseed rape on 16 April 2014 – a perfect crop!