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Perennial weeds: anaerobic soil disinfection & mechanical methods

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Perennial weeds: anaerobic soil disinfection & mechanical methods. Hilfred Huiting, Piet Bleeker & Marleen Riemens EWRS workshop Physical & Cultural Weed Control – Samsun, March 2011. Perennial weeds: setting the scene. Difficult to control:

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perennial weeds anaerobic soil disinfection mechanical methods

Perennial weeds: anaerobic soil disinfection & mechanical methods

Hilfred Huiting, Piet Bleeker & Marleen Riemens

EWRS workshop Physical & Cultural Weed Control – Samsun, March 2011

perennial weeds setting the scene
Perennial weeds: setting the scene
  • Difficult to control:
    • Species intrinsically are very resilient → exhaust strategy
    • Perennial weed problems take a long breath to control
  • In organic farming:
    • No chemical options
    • Increasing labour cost
  • In conventional farming:
    • Increasing farming scale
      • Weed problems may stay unnoticed longer
      • Tendency towards ”easy” solutions may increase problems
    • Herbicide availability
research on perennial weeds
Research on perennial weeds
  • Two field experiments, in Wageningen and Lelystad, integrating reasearch on:
    • Weed phenology
    • Chemical weed control strategies
    • Non-chemical weed control strategies
materials methods weeds
Materials & methods: weeds

Root pieces planted spring 2009

  • Cirsium arvense – creeping thistle
  • Rorippa sylvestris – creeping yellowcress
  • Sonchus arvensis – field sowthistle
  • Calystegia sepium – bindweed
  • Equisetum arvense – field horsetail
  • Tussilago farfara – coltsfoot
  • Elymus repens – couch grass
  • Rumex obtusifolius – bitter dock
  • Polygonum amphibium – water smartweed
materials methods treatments
Materials & methods: treatments
  • Mechanical weed control
    • Broadcast blade
      • Application at 5 cm depth; ”superficial”
      • Application at 15 cm depth; ”deep”
    • Rod weeder
      • Mounted behind rigid tine cultivator
      • Application at c. 6 cm depth
  • Anaerobic soil disinfection, 11 week period
    • Incorporation of weed biomass and covering
    • Incorporation of weed biomass and additional 40 ton/ha fresh grass and covering
materials methods treatments1
Materials & methods: treatments
  • Mechanical weed control
    • Broadcast blade
      • Application at 5 cm depth; ”superficial”
      • Application at 15 cm depth; ”deep”
    • Rod weeder
      • Mounted behind rigid tine cultivator
      • Application at c. 6 cm depth
  • Anaerobic soil disinfection, 11 week period
    • Incorporation of weed biomass and covering
    • Incorporation of weed biomass and additional 40 ton/ha fresh grass and covering
mechanical weed control blade
Mechanical weed control – blade

Sandy soil

Marine loam soil

mechanical weed control rod weeder
Mechanical weed control – rod weeder

Marine loam soil

Sandy soil

overview efficacy mechanical weed control
Overview efficacy mechanical weed control

Efficacy:

  • -: insufficient
  • X: >85%
  • XX: >90%
  • XXX: >95%
  • XXXX: > 99%
anaerobic soil disinfection
Anaerobic soil disinfection

Without grass

With grass

discussion conclusions
Discussion & conclusions
  • Rod weeder very effective after frequent passes
  • Broadcast blade effective as well, if used superficially and frequently
  • Anaerobic soil disinfection may be promissing
  • Results only after one season !!