Weed Management and Cultivation Equipment for … Management and Cultivation Equipment for Vegetable...
Transcript of Weed Management and Cultivation Equipment for … Management and Cultivation Equipment for Vegetable...
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Weed Management and Cultivation Equipment
for Vegetable Farms
Vern Grubinger
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topics to cover
a bit of weed ecology
review of ‘common’ cultivators – chime in!
a look at some new cultivation tools
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GOOD
WEED
CONTROL
COVER
CROPS
MULCH
mechanical weed control is just one part of integrated
weed management
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two key concepts:
• critical weed-free period
–short term management
• weed seedbank
–long term management
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Critical Weed-Free Period = avoiding yield reduction
vs. ease of cultivation, weed seed bank…
When you STOP weeding
When you START weeding
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stop weeding late in crop growth = small yield loss…though other bad things may happen
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weed seed bank management≠ critical period for crop yield
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The Weed Agro-Ecosystem
Manure
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weed seed importation
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weed ‘seed rain’ when you least expect it
Galinsoga setting seed within a Sudex cover crop
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looks good from a distance
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up close is what matters
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cover crops and weeds
• in weedy fields, use short-term covers
• fallow / stale bed before long-term covers
• use high seeding rates; drill seed if possible
• scout long term cover crops for weeds
• time cover kill to avoid key weed reproduction
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the weed seed bank is 3-dimensional
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General effect of weed seed depth on dormancy, germination, and mortality
from: www.extension.org/article/18528
Depth (inches)
Dormancy Germination Mortality
0–0.5 Low High High
0.5–2 Low High Medium
2–5 Medium Low Low
5–10 High Very low Low
Small seeded weeds tend to have low dormancy and high germination at the soil surface; large seeded weeds have medium–high dormancy and low germination at the surface.
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remember that tools are part of a cropping system
optimizing mechanical weed control
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• equipment fits row spacings / bed width
• tools properly adjusted, sharp
• straight, parallel rows with uniform spacing
• stimulate weed germination early
• cultivate shallow as possible
• withhold irrigation afterwards
• have a back up plan…
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Roxbury Farm, Kinderhook NY
uniform bed formation is important
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bed / row marking is important
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cultivation timing: cropPre-Plant -- Pre-Emerge -- Seedling
Growing on -- Mature -- Post- Harvest
Between Row -- In Row -- Tire Tracks
Whole Bed -- Whole Field -- Alleyways
cultivation timing: weeds
cultivation location
White Thread -- Seedling Growing on -- Seed Set
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blind cultivation
• entire field is ‘stirred’ 0.5 to 1.5 inches deep
• small germinating weeds dry out and die
• first pass usually right before crop emergence
• second pass about a week later
• most effective in dry soil, with sunshine, wind
• equipment includes: rotary hoe, tine weeder, spike tooth harrow, spring tooth harrow, chain link harrow
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stale seedbed / bare fallow =blind cultivation prior to sowing crop
spring-tooth harrow
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aggressive stale bed for quackgrass:Danish S-tines with rollers lifted or removed
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flex-tine weeder – white thread or just-emerged weeds
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seedlings must resist a ‘tug’ prior to bind cultivation
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Lely flex-tine weederhas individual tine adjustment
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Market Farm Implementweb site prices:
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Williams tool systemfrom Market Farm Implement:
Lely plus tool bars
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Einbock tine weeder
19” tines are more aggressive than 24” tines, can increase aggression of 24” tines
use lever to adjust angle = down pressure
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from Guy Machinery, Illinois5' $2,590 6.6' $2,775 10' $3,725 15' $6,055 (hydraulic fold)
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Kovar ‘spring tooth harrow’(really a tine weeder)
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tine units ‘float’ on chains
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three lever adjustments determine depth and rotational severity of the ‘teeth’
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tine diameter, tine bend angle, and tine length also affect Kovar aggressiveness
tine diameters: 1/4” or 5/16”
14” straight tine25” tine with 45-degree bend23.5” tine with 80-degree bend
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Ferguson tine weeder, 1950’s?
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lawn de-thatcher tines plus spyders used for aggressive
stale bedding sandy soil beds
hay rake tines belly-mounted on Cub, removable for
different crop row spacings
farm-made cultivation tools
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“I am a huge fan of tine weeding Brassicas. I absolutely nailed a half acre of fall broccoli this year. We did one pass 10 days after transplanting and then exactly zero hand weeding.
Timing is of course important as is bed prep and your transplants have to be good. I use a 2-meter Einbock, with the longer tines set at the shallowest angle and driven at a very particular speed that depends on conditions but is almost always on the fast side.
The degree of damage you do to the crop plants guides you to the correct speed. There will be a moderate number of leaves ripped off and a small number of plants uprooted - not too many. Soil moisture/texture has to be on the dry/friable side; it won't work with wet soil or even an overcast day.”
--NY Farmer 12/31/14
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hand-held flamer for stale seed bed
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bed-width flamer
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tractor-mounted ‘liquid’ flamer
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beforeimmediately
after
works on broadleaves not grassesrepeat after planting = soil disturbancemoisture / dew reduces effectiveness
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remove central tines over crop row,creates little soil movement
between-row cultivation:move soil in, or out, or not
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field cultivator with DanishS- tines over removed
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several European between-row tine designs
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Buddingh basket weedershallow, no movement into row
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50-inch frame works 46 inch bed $3,100 plus $300 shipping, ~30 days
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close up one side then back the other, until plants fill in
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70" frame, 3 row, 10" baskets with 6" outside baskets.~3,500 new from Buddingh; used $2,250 Roeters Farm Equip.
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between-row cultivation that moves more soil
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sweeps, shovels, knives, etc. attach to some type of shank
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side offset
shankforged foot
shank
coil
shank
S-tine
shank
springtooth
shankstraight
shank
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springtine shank
with sweep
side knives
on straight shanks
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moving the shank or the toolbar to adjust for crop growth and/or spacing
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double toolbar retro-fit to replace old cultivators
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side-knives to reduce depth and soil movement vs. shovels
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triple toolbar, double bed
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Bezzerides spyders and spring hoes
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Bezzerides spyders and torsion weeders~$200 per pair of spyders
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sweeps and torsion weeders, note guidance wheels
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Steketee ‘robotic’ torsion weeders
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I & J row crop cultivator
optional hilling disks, shields, etc.
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rolling cultivatorsswivel to push or pull soil
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rolling cultivator or tine weeder better for this?
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In-row cultivation
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Buddingh – the original finger weeder~$3,000 new, for 20-inch or wider rows
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Kress finger weeder - German
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HAK tools - Dutch
finger weeders
torsion weeders
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Steketee finger weeder - Dutch
each ‘arm’ floats on the soil independently
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http://store.suttonag.com/other-farm-equipment/weeding-
equipment.html
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Univerco Eco-weeder - Quebecin-row cultivation with operator
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Eco-weeder ‘hub’ options: 16, 10 and 7-inch
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works OK on bony ground
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2-row Eco weeder
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up to 6-row units
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different passes for in-row and between-row weeds
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Ted Blomgren, Wildflower Farm NYput Steketee cultivators on a modified G
independent between-row cultivation on rocky uneven ground
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linkage lets each row ‘float’
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Ted also fabricated a steerable cultivatorfor better in-row cultivation on rocky uneven ground
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all adjustments are made with a ¾” wrench, including sweep depth, finger tension, and finger separation
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according to Ted…
Cons:
Two operators are required
Communication breakdowns can lead to problems (person in rear seat must speak up)
Pros:
Tractors with a 3-pt hitch become cultivators
Person steering the implement sees all the tools and can make adjustments
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S-tines and discs plus rolling cultivators belly-mounted
many ways to combine tools…
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tine weeder with gauge wheels plus belly-mounted baskets
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Kress: modern in-row and between-row tools on one unit.
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many choices when hand hoeing is necessary
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tractor-pulled hand-weeder, Roxbury Farm, Kinderhook NY
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self-propelled hand-weeder, in development,Pitchfork Farm, Burlington VT
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on line: Video Clips on Organic Weed Managementwww.extension.org/article/19644
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www.uvm.edu/vtvegandberry