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Developments in physical weed control

Code: 9781838794347
Eric R. Gallandt, University of Maine, USA; Daniel Brainard, Michigan State University, USA; and Bryan Brown, University of Maine, USA

Chapter synopsis: Physical weed control is the key method for reducing negative impacts of weeds in organic cropping systems, and remains important even on many conventional vegetable farms. Inter-row cultivation is generally effective, but controlling intra-row weeds remains a challenge. Well-timed use of torsion, finger and tine weeders can control intra-row weeds, with impressive efficacy observed when the tools are combined or ‘stacked’. However, selectivity of intra-row tools depends in part on maintenance of a size differential between crops and weeds, which is particularly challenging in slow-growing, direct-seeded crops. Recent advances in GPS and camera-based guidance system technologies permit high working rates, and increasingly precise, close-to-the-row tool adjustment. Innovative tool design, parameter-based values for adjustment and choice of tool, and advances in mechanistic understanding of weed seedling mortality and crop injury could elevate physical weed control to a level of performance farmers have grown to expect from modern herbicides.

DOI: £25.00
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Table of contents 1 Introduction 2 Tillage 3 Physical weed control: overview 4 Tools, weeds and soil conditions 5 Weed–crop selectivity 6 Fundamental problems with cultivation 7 Future research priorities 8 Where to look for further information 9 References

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