managing black walnut - tree farm...managing black walnut mel baughman professor emeritus university...
TRANSCRIPT
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Managing Black Walnut
Mel Baughman
Professor Emeritus
University of Minnesota
Lenny Farlee
Extension Forester
Purdue University
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Why Grow Black Walnut?
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Wood Products
Rich, brown color
Novelty items
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Lumber products
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Gunstocks
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Veneer
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Silvopasture
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Nuts
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People Food
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Wildlife Food
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Beauty
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Chambered pith
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Leafs out late, drops leaves early
Yellow fall foliage
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Soil & Water Protection
Plant small bottomland fields & slopes
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Biodiversity?
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Where to Grow Walnut
Natural Range
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Growing Season •140 to 280 days
•Prefers > 170 days
•Prefers 550 F average
annual temperature
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Precipitation 25 to 70 inches
Prefers > 35 inches
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Soil: •Deep, fertile, moist, but well-drained
oNeeds > 30 inches of well-drained soil.
oPrefers > 40 inches of well-drained soil.
•Texture: sandy loam, loam, silt loam, silty
clay loam
•pH: Nearly neutral
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Landscape Position Prefers:
•coves
•stream bottoms (alluvial soils)
•lower portion of north- or east-facing slopes
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Airflow
Good airflow, but
not windy sites.
Exposed uplands
okay if walnut is
interplanted with
another species for
wind protection.
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Avoid
Wet bottom land
Sandy or dry ridges and slopes
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Avoid Frost Pockets
Where airflow is minimal and cold air could settle undisturbed.
Narrow valleys with steep adjacent side slopes
Bottomland sites lower than surrounding landscape
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Shade Intolerant
Plant only in forest openings or open fields.
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Walnut grows well with…
Kentucky coffeetree
Yellow-poplar
White ash
Red oak
Basswood
Sugar maple
Slippery elm
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Juglone
Found in:
Leaves
Bark
Nut husks
Roots
Toxic to:
Tomatoes
Paper birch
Red pine
White pine
Scotch pine
Apple
Others…
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Questions?
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Planting Black Walnut
Site Selection Considerations
Soils must be suitable for long-
term growth
Soils information – NRCS offices
and NRCS Web Soil Survey
Walnut Suitability Index
Consult Local Forestry Experts
Get soils tested for pH and
nutrients
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Why are you planting walnut?
Timber Production
• Spacing – 10’ X 10’ or
closer
• Nurse trees
• Mixed species
• Genetically selected
stock
• Locally adapted stock
• www.htirc.org
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Why are you planting walnut?
Nut crop
Selected tree lines for
nut quality/quantity
High quality walnut soils
Wide spacing – 25 to 30
feet at planting
University of Missouri
Center for Agroforestry,
Growing Black Walnut
for Nut Production
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Why are you planting walnut?
Walnut Agroforestry
Spacing and design depends
on desired cropping plan
Silvopasture
Alley cropping
Windbreaks/shelterbelts
Forest farming
University of Missouri
Center for Agroforestry
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Preparing your site to plant
Start the summer before if
spring planting
Control competing plants
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Disk or deep rip to
break up compacted
soil
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Planting Typically spring
planting for bare-
root stock
Plant early in spring
to take advantage of
spring rains and a full
growing season
Keep seedlings cool
and moist until
planted
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Mechanical Tree Planting
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Planting Nuts
Collect in the fall
Easier to handle
when de-husked
Fall or spring planting
Float seed to test
Stratification
Seed predators
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Check seed
quality
Protect seed from
predators
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Sprouted seed plantings
• Stratified
• Spring planting
• Protect from seed
predators
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Questions?
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Thinning helps
us retain the
best trees and
grow them at a
desired rate.
“A few fat
carrots or lots
of skinny ones”
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Thinning Walnut Stands
Natural stands
Spend some time
with your forester
Identify crop trees
Kill grapevines in or
near crop trees
Create growing
space
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Thinning Walnut Stands
Plantations
Early competition to
encourage straight
stems and small side
limbs
Thinning to maintain
even, vigorous growth
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Select and
thin around
crop trees
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Kill cull trees
Diseased trees
Poor form
Damage/defects
Slow growers
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Potential Crown Width (feet) = 1.993 X d.b.h.
(inches) + 4.873.
An easy field guide:
PCW (feet) = 2 X d.b.h. (inches) + 5
Divide Actual Crown Width by PCW to get a
Crown Width Ratio (CWR)
CWR = 1 = 100% potential growth
CWR = 0.8 = 75% potential growth
CWR = 0.7 = 53% potential growth
When should I thin?
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Questions?
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Pruning Walnut
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It Doesn’t Always Work
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1
2
3
4
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1 2
3 4
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Prune Dead & Dying Limbs
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Infected Pruning Cut
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Oh No!
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Uh Oh!
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Questions?
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Pests and Environmental
Problems
Wind damage
Frost damage
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Thousand Cankers Disease
www.thousandcankers.com
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Defoliators: Walnut Caterpillar
Yellownecked Caterpillar
Fall Webworm
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Walnut Anthracnose
Fungal disease that can
cause premature
defoliation
Reduced growth and
increased susceptibility
to other diseases
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Nut pests
Walnut Curculio
Walnut Husk Maggots
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Animal Damage
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Questions?
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Marketing Black Walnut Timber
Professional forester
assistance
Stumpage or logs?
Advertise to local and
regional markets
Use a competitive process
– sealed bid
Ask for certifications,
training, insurance,
references
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Selection of the Trees to Market
Get assistance from a
forester who knows the
local/regional markets
Selecting the right trees
to market now and the
right trees to retain can
improve future income
potential
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Black Walnut
Prime Veneer
Log Dia. ($/MBF)
12-13 2993
14-15 4158
16-17 4891
18-20 5817
21-23 5872
24-28 6417
>28 6500
Black Walnut
Sawtimber
Grade $/MBF
Prime 1389
No. 1 1079
No. 2 709
No. 3 393
Average delivered log
prices from 56 Indiana
mills, 2011
2011 Forest Products Price Report and Trend
Analysis - Dr. Bill Hoover and Greg Preston
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Make sure everybody is on the
same page – and the page is signed
Have a timber sale
contract
Indicate what is being
sold
Spell out payment
schedule
Outline
requirements for
operating on the
property - BMPs
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Can I sell individual or small
numbers of walnut trees?
It depends…
Very high value trees
Combine sales with
neighbors to increase
total value/volume
Work with a
specialist in small
timber volume –
portable mills,
specialty products
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Resources for Managing Black
Walnut
The Walnut Council
USDA Forest Service
Walnut Notes
Your forester
Extension publications
from your land grant
university
Hardwood Tree
Improvement and
Regeneration Center