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THE POWER
OF CROP
ROTATIONS Dwayne Beck
DLRF
www.dakotalakes.com
PNDSA CONFERENCE 2014
Dakota Lakes Research Farm
• OWNED BY FARMERS
• BOTH IRRIGATION AND DRYLAND
• 100% LOW-DISTURBANCE NO-TILL
• PRODUCTION ENTERPRISE
PROFITS SUPPORT RESEARCH
1970
Average Wheat Price
in 1970 was $1.37/bu.
The Average price of a
barrel of oil was $3.39
In Minnesota where
tillage is king, it takes
slightly under 10 gallons
of diesel/acre for tillage,
seeding, and harvest.
It takes the energy of 1
gallon of diesel fuel to
manufacture, transport
and apply 5 lbs of N
If the Minnesota farmer
applies 150 lbs/acre of N,
the energy involved is
three times that used for
tillage, seeding, and
harvest.
Eighty Percent of the
total input costs in
agriculture can be
traced directly to
energy at the present
time.
120 years ago that was
essentially zero
In 120 years, it will have
to be zero again.
Cold-Pressed Oil Results
DLRF 2009 Crop This is about 60 to 80 gal/acre
Species Seed Meal Oil
Percent
Oil
Canola (napus) 2390 1714 625 26%
I AM A FARMER. I TAKE SUNLIGHT,
WATER, AND CARBON
DIOXIDE AND MAKE
THEM INTO PRODUCTS
THAT I CAN SELL.
Sustainable.
No-till.
Regenerative.
Organic.
Zero Till
Direct Seed
Cover Crops
Diversified Rotations
No till
The Key To Success
Define Beautiful
Woman
or
Handsome Man
Ethical Oil
We spend lots of time
trying to define what we
SHOULD DO or NOT
DO and little time
focusing on where we
want to be.
DETAILS NOT SYSTEMS
Consequently much of the
research and management effort is
devoted to optimizing a single
component (canola or corn
production) by using more and
more specialized treatments.
Reaction not Action
Instead of acting to get
where we want to be, we are
reacting to keep from going
where we do not want to be.
This is like trying to drive
down the highway by
looking at the edge of the
ditch. It works in a
blizzard but it is not
ideal.
There is no better time
than now to define where
you want to be and where
you want the Pacific
Northwest and agriculture
to be 200 years in the
future.
WHAT 30 YEARS OF
NO-TILL AND CROP
ROTATON WORK
HAVE TAUGHT ME
REMEMBER THAT I
AM A SLOW
LEARNER.
I HAVE LEARNED
MORE FROM
FARMERS THAN
THEY HAVE
LEARNED FROM
ME.
I HAVE LEARNED
MORE FROM
OBSERVING
NATURE THAN BY
TRYING TO
CHANGE IT.
1. NO-TILL IS JUST
ONE TOOL AMONG
MANY, THAT WE
USE TO HELP US
MANAGE OUR
ECOSYSTEM.
Adopt A
Crop Production
System
Residue
Disease
Pests
Soil Moisture
Varieties
Weeds
Rotation
Tillage
Adopt A
Crop
Productio
n
Syste
m
Residue
Disease
Pests
Soil Moisture
Varieties
Weeds
Rotation
Tillage
Farming System Components
• Cultural Practices
• Technology
• Management
CULTURAL PRACTICES
• TILLAGE
• ROTATION
• SANITATION
• COMPETITION
IN NATURE
TILLAGE IS A
CATASTROPHIC
EVENT
CULTURAL PRACTICES
• TILLAGE
• ROTATION
• SANITATION
• COMPETITION
• Proper Intensity
• Adequate Diversity
• Stable/Sustainable Profitability
Crop Rotations
ECOSYSTEM PROCESSES
• WATER CYCLE
• ENERGY FLOW
• MINERAL CYCLE
• COMMUNITY DYNAMICS
2. Farmers and
Ranchers harvest
sunlight, carbon
dioxide, and water to
produce products we
can sell.
Some of this is human food, we
need to be aware of nutrition
issues and off-site impacts.
If we want to eat beef, maybe
we should concentrate on
producing beef instead of corn
or barley that feeds beef in
feedlots.
3. Weeds and diseases
are Mother Nature’s
way of adding
diversity to a system
that lacks it.
Nature’s efforts to add
diversity can be
countered by adding
beneficial diversity to
the system.
DIVERSITY IN CROP TYPE
•Diversity in seeding date.
•Diversity in rooting pattern.
•Diversity in root architecture.
•Diversity in residue type.
•Diversity in insect pests.
DIVERSITY IN CROP TYPE
•Diversity in weed suppression.
•Diversity in micro organisms.
•Diversity in harvest date.
•Diversity in beneficials.
•Diversity in ………MORE.
The goal is to be
INCONSISTENT
in both sequence
and interval
Weed Seed Survival on Soil
Impact of Rotation & Low
Disturbance on Weed Seeds
Weed of Interest: Cheatgrass
Number of Weeds Previous: 10
Number of Seeds Per Weed: 100
Rotation Interval Vs.
Weeds
-2.0E+06
0.0E+00
2.0E+06
4.0E+06
6.0E+06
8.0E+06
1.0E+07
1 3 5 7 9 11 13 15 17
Years
Weed
s In
Millio
ns
1 Year Out
2 Years Out
2 In - 2 Out
Rotation Interval Vs.
Weeds
-2.0E+06
0.0E+00
2.0E+06
4.0E+06
6.0E+06
8.0E+06
1.0E+07
1 3 5 7 9 11 13 15 17
Years
Weed
s I
n M
illi
on
s
Continuous
2 In - 1 Out
2 In - 2 Out
2 In - 3 Out
2 In - 4 Out
CHEAT GRASS EFFECTS ON WHEAT YIELDS
AS INFLUENCED BY
ROTATION, SANITATION AND COMPETITION
WINTER WHEAT-CORN-BROADLEAF ROTATION
CHEAT PRESSURE (TREATMENT IN THE BROADLEAF CROP)
ARAPAHOE
KARL 92
High Pressure
(No Burndown; No Post)
50.8
31.9
Medium Pressure
(Burndown; No Post)
65.7
64.8
Low Pressure (Burndown and Post)
65.6
77.1
DAKOTA LAKES RESEARCH FARM-1996
Greenhouse Evaluation of ALS-resistance in
Cheat and Japanese Brome-Kansas 2007
Cheat Japanese brome
Susceptible Resistant Susceptible Resistant
population population population population
Product and Rate
(Oz/Acre)
Percent control
Olympus at 0.9 93 3 96 0
Maverick at 0.67 92 0 93 0
Beyond at 4 94 65 94 40
Does it Work ? (Field Trial)
Long-Term Rotation Study
Cool and Warm Season Crops
No-Till : Herbicides - Weed Control
Weed Density After 12 Years
(No Herbicides – Number of Weeds / m2)
94
40
7
0
25
50
75
100
W-CP W-C-CP Pea-W-C-SB
Weeds
(plts/m2)
Rotation Design < - > Weeds
4. High disturbance
techniques increase
weed pressure and
cause tillage erosion.
11
28
55
0
20
40
60
0 2 4
Depth in Soil (inches)
Live Seed (%)
Green Foxtail Survival in Soil
After 2 Years
2 Crop
Rotation
4 Crop
Rotation
2 vs 4
Contrast
Tilled Site 225 44 1/5
No-Till
Site 94 7 1/13
Rotation – Tillage Interaction
(No Herbicides – Weeds / m2)
• Tillage (disturbance) and Poor
Rotation gives 225 weeds/m2
• No-till and GOOD Rotation 7
weeds/m2
• That is 97% weed control
IF TILLAGE WAS GOOD
AT ELIMINATING
WEEDS, THEY SHOULD
ALL BE GONE BY NOW.
A
B
C
a) Uncultivated
A
B
C
a) cultivated, medium-term
A
B
C
b) cultivated, long-term
5. Sanitation,
Rotation, and
Competition are the
primary methods of
pest control.
Over-reliance on herbicides
leads to resistant weeds AND
maybe disease problems.
Using surfactants too
frequently may increase disease
issues.
Pesticides are only part of
sanitation, rotation, and
competition.
Fertilizer placement and
residue distribution are part of
competition.
Fertility Management • Some starter P with the seed.
• Other nutrients placed near row at seeding or on soil surface after crop canopy.
• broadcast fertilizer before or at seeding encourages weeds.
• Three key factors
– 1 Available Nutrient
– 2 Moisture
– 3 Roots
6. Proper nutrient
cycling is an extremely
important factor.
Ecosystems that leak nutrients for
extended periods become deserts.
Saline seeps are symptom of
improper nutrient and water cyc
ling.
Decreasing pH indicates leakage.
7. Developing proper
water cycling
information is
important.
Knowledge of the soil’s water holding
capacity characteristics is important.
Long-term rainfall data must be used.
Cover and forage crops are useful to
help fine-tune the system.
http://websoilsurvey.nr
cs.usda.gov/app/
ONIDA October 1.58
November 0.82
December 0.57
January 0.59
February 0.64
March 1.38
April 1.93
May 2.85
June 3.11
July 2.69
August 2.14
September 1.54
Annual 19.84
Take the
E out of
ET
ONIDA
Time Period
Total Precip
Fallow period
Crop Period
If 1/2 of normal
If 1 and 1/2 of normal
Long Fallow July to next Sept.
24.67
W Wheat fallow W Wheat
Wheat Maturity to Corn Maturity
12.34
37.01
Saline Seep
Formation
COVER and FORAGE
CROPS
Cover and forage crops provide the opportunity to increase both intensity and diversity in situations where production of a grain crop would not be possible, would be unprofitable, or would be excessively risky.
COVER CROPS
In humid environments (tall-grass prairie or wetter) the goal should be to have something growing at all times. In areas with a limited growing season this will require the use of cover crops and/or forage double crops.
COVER CROPS
In subhumid, semiarid, and arid environments cover crops can be utilized to increase organic matter and biological activity.
Irrigated Corn By Previous Crop
Wheat-Wheat-C-C-SB-SB rotation
2009 Dakota Lakes Res. Farm
Rotation N rate 0
lb
Yield
Bu/ac
N rate 36
Yield
Bu/ac
N rate 72
Yield
Bu/ac
N rate
108
Yield
Bu/ac
CC – lentil,
CVetch,
turnip
176.0 236.1 214.0 233.9
Nitrogen rate impact on yields
STN = 108 lbs/ac Yield goal = 220 bu/ac
CATCH AND
RELEASE
NUTRIENTS
COVER CROPS
If you get stranded in a rain on the back 40, do you drive home across the tilled field or the pasture?
PROPER INTENSITY
Crop insurance regulations impact the risk associated with differing rotational intensities.
8. There should be no
need to use a ground
engaging component ot
seed and fertilize
crops.
Clay seed balls.
“One Straw Revolution.”
Seed stakes, etc.
9. Livestock
integration will be
needed.
Nutrient cycling.
Rotational flexibility.
It must be automated and multi-species.
Chance for young people to enter.
10. Use of perennial
sequences or perennial
cover-crops will
probably be necessary.
Nutrient cycling.
Rotational flexibility.
Building organic matter.
Organic matter is the most
important factor in
determining the productivity of
a soil.
“Soil organic matter and available water capacity.” Hudson,
B.D. Journal of Soil and Water Conservation. 49:180–194.
1994
A small amount of organic
matter by weight has a big
impact on pore space because
it only weighs 1/5 as much for
the same volume.
“Within all textural groups, as
organic matter increased from
1 to 3%, the available water
capacity approximately
doubled. .
When organic matter content
increased to 4%, it then
accounted for more than 60%
of total AWC
.
Rotation Impact on W.Wheat
Dakota Lakes Research Farm Rotation Yield Precip*
Corn-Pea-WW 2006 60 7.9
SB-Corn-Pea-WW 2006 29
Corn-Pea-WW 2005 92 23.7
Sb-Corn-Pea-WW 2005 57
Corn-Pea-WW 2002 56 6.4
SB-Corn-Pea-WW 2002 28
Corn-Pea-WW
Sb-Corn-Pea-WW
Nutrients Lost by Removing Straw 75 bu/acre wheat or ½ of a 150 bu/acre corn crop
Nutrient Content in
Straw
Percent Lost
N 50 lbs/acre 100
P 5 lbs/acre 100
K 100 lbs/acre 100
CARBON 3000 lbs/a 100
ORGANIC
MATTER MAKES
A DIFFERENCE.
Adopt A
Crop Production
System
Residu
e
Disease
Pests
Soil Moisture
Varieties
Weeds
Rotatio
n
Tillag
e
Wheat Health Management Cook and Veseth
Savings might be expected in the amount of
fertilizer and irrigation water used in a 3-
year rotation, because of the healthier,
more functional root systems of plants
grown in soil sanitized by the rotation.
Wheat Health Management Cook and Veseth
Biological control of the soil and
residue-inhabiting pests of wheat is
accomplished by not growing wheat
……more frequently than every
second or third year.
Wheat Health Management Cook and Veseth
A change in cultural practice…….may
not pay off in the first 1 or 2 years, but
it will pay off over time.
Wheat Health Management Cook and Veseth
Each future wheat field is treated, to
the the extent possible, as an
ecosystem to be nudged rather than
shocked in a desired direction.
Wheat Health Management Cook and Veseth
Crop rotation is probably the single
most critical factor affecting the health
and productivity of a future wheat
crop.
Wheat Health Management Cook and Veseth
Crop rotation allows time for natural
enemies to destroy the pathogens of
one crop while……unrelated crops are
grown.
Wheat Health Management Cook and Veseth
Choose a sustainable economic
approach that optimizes productivity
while taking maximum advantage of,
or at least not upsetting nature’s own
contributions to the health of the
crop……
TAKE THE
E OUT OF
ET
TAKE THE
‘T OUT OF
CAN’T
A good treatment of
rotation types can be
found at:
www.dakotalakes.com
under publications
www.dakotalakes.com