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Weedy Crop Rotation

CoverCrop Rotation Presentation
by

David Blake

on 9 March 2011

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Transcript of Weedy Crop Rotation

Weed Control
By Rotation
Of Cover Crop Cover Crops - What are they? Advantages of Cover Crops Disadvantages of Cover Crops What is Crop Rotation? Why Rotate? Weeds - The Usual Suspects Who you gonna call...Weedbusters! What Else can a Cover Crop do? Rotation of Cover Crops is No. 1 Because.... The Proof of the Pudding Non-economic crop grown in vineyard
middles or amongst rows
(University of California, 1998)

Classified as: Winter or summer annuals
Perennials

By taxonomy: Legumes/Grasses/Brassicas

“Resident vegetation” – using weeds as cover crop
Faba Bean Common Vetch Annuals

Legumes. E.G. Faba Beans or Vetches Weedbusters – Part II Annuals - Grasses
E.g. Rye Weedbusters Part III
Perennials Strawberry Clover White Clover Weedbusters Part IV Brassicas White Mustard Field Mustard What else can a
cover crop do? Reduces erosion
Controls erosion or run off on hillsides or terraced
vineyards
Improves soil structure
Organic matter
Increased microbial activity
May limit excess vigour or may help in control vigour
Can help prevent unwanted weeds
Habitat for beneficial insects
Organic vineyards
Fix nitrogen and control N2 availability in the soil
Cover crop- arthropod interrelationships Increased water use
Competition with vine for soil nutrients and water
Frost hazard
Increased pests
Increased costs and management
Additional equipment
Decreased aesthetics Cultivation breaks down Soil Structure
Cultivation and herbicides reduce Microbial Activity
Herbicides cost £££££
Cover crops are environmently friendly & organic
Permanent cover crops deplete nutrients over time
PCC only work with few weeds. Rotation gets the lot.
Animals smell
Flames is dangerous
Isik et al (2008) study showed cover crop reduced weed density by up to 73% in organic crops.

Shrestha et al (2000) showed cover crop rotation could control specific weeds.

A 2001 paper by P. Barberi of Piza Italy, showed that controling weeds by cover crop is effective if done over a larger timescale.

Steinmaus et al (2007) from California Polytechnic showed that mowed cover crop was effective at controling weeds and saved $794 a hectare.

Kruidhoff et al (2008) showed that seeding cover crops before the weeds seeded was effective at controling specific weeds.

Act as a home for beasties that eat the beasties that eat the vines

Can act as a contraceptive to nematodes

Cover crops can be sold ££££
You may applaud Crop rotation is the practice of growing
a series of dissimilar types of crops in the
same area in sequential seasons for
various benefits such as to avoid the
build up of pathogens and pests that
often occurs when one species is
continuously cropped. Help control pests & diseases (bacterial & fungal) host plants that are continuously grown in same soil pests & diseases can build up to epidemic proportion

Improves soil fertility & quality – some crops at high levels of nitrogen eg: leguminous crops. Aids in drainage, texture, pH, replenishes organic matter

Weed control – dense foliage crops can prevent seed germination of undesirable weeds

Can grow crops in alternate rows. each crop having different beneficial effect
Perennials – year to year plants with vigours root systems

1) Couch grass (Agropyron repens)
2) Dandelion (Taxaxacum officinalis)
3) Ground elder (Aegopodium podograria)
4) Dock (Rumex spp.)
5) Nettles (Urtica spp.)
6) Marestail or horsetail (Equisetum arvense)
7) Hedge & field bindweed
(Calystegia sepium & Convolvulus arvensis)
Full transcript