Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s...
Transcript of Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s...
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Precision Irrigation
Management: What’s Now
and What’s New (Part 2)
December 7, 2016
![Page 2: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/2.jpg)
Precision Irrigation
Management: What’s Now and
What’s New (Part 2)
Bob Curtis, Almond Board of California
(Moderator)
Blake Sanden, UCCE – Kern County
Andrew McElrone, USDA-ARS, Davis
Allan Fulton, UCCE – Tehama County
Kent Stenderup, Stenderup Ag Partners
![Page 3: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/3.jpg)
Bob Curtis,
Almond Board of California
![Page 4: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/4.jpg)
Blake Sanden,
UCCE – Kern County
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Precision Irrigation Management:
What’s Now and What’s New (2)Blake Sanden
UCCE Irrigation/Soils Advisor, Kern Co.
• Estimating crop water use, ETc
• Measuring ETo and CIMIS
• Real Almond ETc and Crop
Coefficients (Kc)
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• Optimal
photosynthesis
• Maximum carbon
dioxide uptake
• Leaf cooling/water loss
from transpiration
Where am I on the “IRRIGATION CONTINUUM”?
What’s the main thing that keeps the crop
growing?
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ELECTRON MICROGRAPH OF STOMATA ON THE
UNDERSIDE OF A LEAF.
Reduced water/deficit irrigation, causes less turgor
pressure in the plant, reduces the size of stomatal
openings; thus decreasing transpiration/water loss, the
uptake of carbon dioxide and reducing vegetative growth.
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Increased conductance = increased
transpiration (water loss)
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Orchard water use is made up of EVAPORATION (E) from
the wet soil and leaves and TRANSPIRATION (T), hence ET
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But all I ever
hear is the
term “ET”.
So how can I
know how
much water
goes to
productive
tree
transpiration
vs.
evaporation?
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Is all this water available to my 1st leaf trees with a small developing rootzone? What about evaporative losses and deep percolation?
For optimal growth these young trees may only use 50% of the applied water with this type of system the first 2 years.
Check soil moisture
here for optimal tree
growth.
Check soil moisture
here for maximum
water use efficiency.
Do micro systems always lose less water to
evaporation and are more efficient than flood?
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Calculating ET for crops:
ETcrop = ETo * Kc * Ef
ETo = reference crop (tall grass) ET
Kc = crop coefficient for a given stage of
growth as a ratio of grass water use. May be 0
to 1.3, standard values are good starting point.
Ef = an “environmental factor” that can
account for immature permanent crops and/or
impact of salinity. May be 0 to 1.1, determined
by site specific factors – soil/salinity/system DU
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From 1968 to 1990 detailed records of Class A pan
evaporation were recorded in dozens of locations
around the SJV. Using:
ETo = 0.85 Evaporation
a 20 year average ETo of 49.3 inches was
published by CA Dept of Water Resources in 1993.
Potential or Reference
evapotranspiration (ETo)
is the water use of well-
watered pasture grass.
First estimated using
Class A evaporation pans
and weighing lysimeters.
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CIMIS Weather Station
Courtesy of Mark Anderson, DWR
CALIFORNIA IRRIGATION
MANAGEMENTINFORMATION SERVICE
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The whole Central
Valley covers Zones
12 to 16: for an
“normal year” ETo of
53.3 to 62.5 in/yr,
with most area
@ 53 to 58 inches.
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16
Why did “normal year” ETo increase from 1993-1999?Our understanding and accuracy of environmental and plant systems keeps
improving. Then does this mean the old Kc values are always accurate?
0.00
0.50
1.00
1.50
2.00
2.50
1/1 1/31 3/2 4/1 5/1 5/31 6/30 7/30 8/29 9/28 10/28 11/27 12/27
Po
ten
tial
Gra
ss E
T (
ET
o, i
nch
es/w
eek)
1993 DWR Evap Pan ETo: 49.3 in
1999 CIMIS ETo: 57.9 in
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How do we figure out ETo? Access California
Irrigation Management Information System on-line.
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OK on ETo for my area. Where do I get
the right (?) crop coefficients, Kc
• http://wwwcimis.water.ca.gov/
• http://cekern.ucanr.edu/Irrigation_Management/Almond_
Drip_-_Microsprinkler_-_Flood_Weekly_ET/
• http://www.almonds.com/irrigation#tc-irrigation-
management (Almond Board website)
• https://www.sustainablealmondgrowing.org/
– (full on irrigation calculator, must sign in, sponsored by ABC)
• http://thealmonddoctor.com/irrigation-management/
• http://ucmanagedrought.ucdavis.edu/Agriculture/Crop_Irri
gation_Strategies/Almonds/
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Severe Deficit in this period
will increase shriveled nuts
Deficit in this period will
increase “texturing”, decrease
kernel weight
Deficit in this period will
decrease nut/fruit size
Deficit in this period
has minimal effects
Deficit in this period
effects fruit bud set
Stress at any period
reduces vegetative growth,
affects future yield!Drought Strategies Explained
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20
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
1/6 2/6 3/6 4/6 5/6 6/6 7/6 8/6 9/6 10/6 11/6 12/6
Cro
p C
oef
fici
en
t (K
c) o
r W
ee
kly
ET (
in)
Comparison of Grass and Almond ET
Grass ETo (57.9 in)
Almond crop coefficient (Kc)
Mature Almond ET (52.3 in)
Uncut well watered pasture grass Kc = 1.0
Full cover almond ET
lags behind pasture ET
and then surpasses
grass water use from
June through September
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ET Estimates Using CIMIS Zone 15 Southern SJV "Historic" ETo (1st published 2002)
Normal
Year
Grass
Mature
Crop
Coef-
20X22
Spacing
Gallon /
Week
ETo
(in)
ficient
(Kc)
1st Leaf
@ 40%
2nd Leaf
@ 55%
3rd Leaf
@ 75%
4th Leaf
@ 90% Mature
Daily
Avg
day /
tree
1/6 0.21 0.40 0.03 0.05 0.06 0.08 0.09 0.01 3
1/13 0.28 0.40 0.04 0.06 0.08 0.10 0.11 0.02 4
1/20 0.30 0.40 0.05 0.07 0.09 0.11 0.12 0.02 5
1/27 0.36 0.40 0.06 0.08 0.11 0.13 0.14 JAN 0.46 0.02 6
2/3 0.42 0.40 0.07 0.09 0.13 0.15 0.17 0.02 7
2/10 0.47 0.40 0.08 0.10 0.14 0.17 0.19 0.03 7
2/17 0.54 0.40 0.09 0.12 0.16 0.19 0.22 0.03 8
2/24 0.61 0.40 0.10 0.13 0.18 0.22 0.24 0.03 10
3/3 0.69 0.42 0.12 0.16 0.22 0.26 0.29 FEB 1.02 0.04 11
3/10 0.79 0.61 0.19 0.27 0.36 0.43 0.48 0.07 19
3/17 0.89 0.64 0.23 0.31 0.43 0.51 0.57 0.08 22
3/24 0.98 0.67 0.26 0.36 0.49 0.59 0.65 0.09 26
3/31 1.09 0.72 0.31 0.43 0.59 0.70 0.78 MAR 2.57 0.11 31
4/7 1.19 0.74 0.35 0.48 0.66 0.79 0.88 0.13 35
4/14 1.32 0.75 0.40 0.55 0.74 0.89 0.99 0.14 39
4/21 1.41 0.81 0.46 0.63 0.85 1.03 1.14 0.16 45
4/28 1.49 0.83 0.50 0.68 0.93 1.12 1.24 APR 4.64 0.18 49
5/5 1.59 0.86 0.55 0.75 1.03 1.23 1.37 0.20 54
5/12 1.66 0.90 0.60 0.83 1.13 1.35 1.50 0.21 59
5/19 1.73 0.94 0.65 0.89 1.22 1.46 1.63 0.23 64
5/26 1.78 0.96 0.69 0.94 1.29 1.54 1.72 0.25 67
6/2 1.85 0.98 0.72 0.99 1.35 1.62 1.80 MAY 7.15 0.26 71
6/9 1.86 0.99 0.73 1.01 1.38 1.65 1.83 0.26 72
6/16 1.90 1.02 0.77 1.06 1.45 1.74 1.93 0.28 76
6/23 1.93 1.05 0.81 1.11 1.52 1.82 2.03 0.29 79
6/30 1.93 1.06 0.82 1.13 1.54 1.85 2.05 JUN 8.36 0.29 80
7/7 1.93 1.08 0.83 1.14 1.56 1.87 2.07 0.30 81
7/14 1.93 1.08 0.83 1.14 1.56 1.87 2.07 0.30 81
7/21 1.86 1.08 0.80 1.10 1.50 1.80 2.00 0.29 78
7/28 1.86 1.07 0.80 1.10 1.50 1.79 1.99 JUL 8.96 0.28 78
8/4 1.78 1.07 0.77 1.05 1.44 1.72 1.91 0.27 75
8/11 1.75 1.08 0.76 1.04 1.42 1.70 1.89 0.27 74
8/18 1.69 1.08 0.73 1.00 1.36 1.64 1.82 0.26 71
8/25 1.62 1.07 0.70 0.96 1.30 1.57 1.74 0.25 68
9/1 1.55 1.07 0.66 0.91 1.24 1.49 1.66 AUG 7.96 0.24 65
9/8 1.47 1.06 0.62 0.85 1.17 1.40 1.55 0.22 61
9/15 1.40 1.04 0.58 0.80 1.08 1.30 1.45 0.21 57
9/22 1.31 1.02 0.53 0.73 1.00 1.19 1.33 0.19 52
9/29 1.19 0.97 0.46 0.64 0.87 1.04 1.16 SEP 5.87 0.17 45
10/6 1.10 0.95 0.42 0.57 0.78 0.94 1.04 0.15 41
10/13 1.00 0.88 0.35 0.48 0.66 0.79 0.88 0.13 35
10/20 0.90 0.88 0.32 0.43 0.59 0.71 0.79 0.11 31
10/27 0.77 0.83 0.26 0.35 0.48 0.58 0.64 OCT 3.49 0.09 25
11/3 0.67 0.78 0.21 0.29 0.39 0.47 0.53 0.08 21
11/10 0.57 0.71 0.16 0.22 0.31 0.37 0.41 0.06 16
11/17 0.48 0.68 0.13 0.18 0.25 0.30 0.33 0.05 13
11/24 0.42 0.60 0.10 0.14 0.19 0.22 0.25 0.04 10
12/1 0.36 0.50 0.07 0.10 0.13 0.16 0.18 NOV 1.32 0.03 7
12/8 0.31 0.40 0.05 0.07 0.09 0.11 0.12 0.02 5
12/15 0.29 0.40 0.05 0.06 0.09 0.10 0.11 0.02 4
12/22 0.25 0.40 0.04 0.06 0.08 0.09 0.10 0.01 4
12/29 0.21 0.40 0.03 0.05 0.06 0.08 0.09 DEC 0.47 0.01 3
Total 57.90 20.91 28.75 39.20 47.05 52.27 52.27
Almond ET -- Minimal Cover Crop, MIcrosprinkler
(inches, S. San Joaquin Valley)
Monthly
Total
ET Estimates Using CIMIS Zone 15 Southern SJV "Historic" ETo (1st published 2002)
Normal
Year
Grass
Mature
Crop
Coef-
20X22
Spacing
Gallon /
Week
ETo
(in)
ficient
(Kc)
1st Leaf
@ 40%
2nd Leaf
@ 55%
3rd Leaf
@ 75%
4th Leaf
@ 90% Mature
Daily
Avg
day /
tree
1/6 0.21 0.40 0.03 0.05 0.06 0.08 0.09 0.01 3
1/13 0.28 0.40 0.04 0.06 0.08 0.10 0.11 0.02 4
1/20 0.30 0.40 0.05 0.07 0.09 0.11 0.12 0.02 5
1/27 0.36 0.40 0.06 0.08 0.11 0.13 0.14 JAN 0.46 0.02 6
2/3 0.42 0.40 0.07 0.09 0.13 0.15 0.17 0.02 7
2/10 0.47 0.40 0.08 0.10 0.14 0.17 0.19 0.03 7
2/17 0.54 0.40 0.09 0.12 0.16 0.19 0.22 0.03 8
2/24 0.61 0.40 0.10 0.13 0.18 0.22 0.24 0.03 10
3/3 0.69 0.42 0.12 0.16 0.22 0.26 0.29 FEB 1.02 0.04 11
3/10 0.79 0.61 0.19 0.27 0.36 0.43 0.48 0.07 19
3/17 0.89 0.64 0.23 0.31 0.43 0.51 0.57 0.08 22
3/24 0.98 0.67 0.26 0.36 0.49 0.59 0.65 0.09 26
3/31 1.09 0.72 0.31 0.43 0.59 0.70 0.78 MAR 2.57 0.11 31
4/7 1.19 0.74 0.35 0.48 0.66 0.79 0.88 0.13 35
4/14 1.32 0.75 0.40 0.55 0.74 0.89 0.99 0.14 39
4/21 1.41 0.81 0.46 0.63 0.85 1.03 1.14 0.16 45
4/28 1.49 0.83 0.50 0.68 0.93 1.12 1.24 APR 4.64 0.18 49
5/5 1.59 0.86 0.55 0.75 1.03 1.23 1.37 0.20 54
5/12 1.66 0.90 0.60 0.83 1.13 1.35 1.50 0.21 59
5/19 1.73 0.94 0.65 0.89 1.22 1.46 1.63 0.23 64
5/26 1.78 0.96 0.69 0.94 1.29 1.54 1.72 0.25 67
6/2 1.85 0.98 0.72 0.99 1.35 1.62 1.80 MAY 7.15 0.26 71
6/9 1.86 0.99 0.73 1.01 1.38 1.65 1.83 0.26 72
6/16 1.90 1.02 0.77 1.06 1.45 1.74 1.93 0.28 76
6/23 1.93 1.05 0.81 1.11 1.52 1.82 2.03 0.29 79
6/30 1.93 1.06 0.82 1.13 1.54 1.85 2.05 JUN 8.36 0.29 80
7/7 1.93 1.08 0.83 1.14 1.56 1.87 2.07 0.30 81
7/14 1.93 1.08 0.83 1.14 1.56 1.87 2.07 0.30 81
7/21 1.86 1.08 0.80 1.10 1.50 1.80 2.00 0.29 78
7/28 1.86 1.07 0.80 1.10 1.50 1.79 1.99 JUL 8.96 0.28 78
8/4 1.78 1.07 0.77 1.05 1.44 1.72 1.91 0.27 75
8/11 1.75 1.08 0.76 1.04 1.42 1.70 1.89 0.27 74
8/18 1.69 1.08 0.73 1.00 1.36 1.64 1.82 0.26 71
8/25 1.62 1.07 0.70 0.96 1.30 1.57 1.74 0.25 68
9/1 1.55 1.07 0.66 0.91 1.24 1.49 1.66 AUG 7.96 0.24 65
9/8 1.47 1.06 0.62 0.85 1.17 1.40 1.55 0.22 61
9/15 1.40 1.04 0.58 0.80 1.08 1.30 1.45 0.21 57
9/22 1.31 1.02 0.53 0.73 1.00 1.19 1.33 0.19 52
9/29 1.19 0.97 0.46 0.64 0.87 1.04 1.16 SEP 5.87 0.17 45
10/6 1.10 0.95 0.42 0.57 0.78 0.94 1.04 0.15 41
10/13 1.00 0.88 0.35 0.48 0.66 0.79 0.88 0.13 35
10/20 0.90 0.88 0.32 0.43 0.59 0.71 0.79 0.11 31
10/27 0.77 0.83 0.26 0.35 0.48 0.58 0.64 OCT 3.49 0.09 25
11/3 0.67 0.78 0.21 0.29 0.39 0.47 0.53 0.08 21
11/10 0.57 0.71 0.16 0.22 0.31 0.37 0.41 0.06 16
11/17 0.48 0.68 0.13 0.18 0.25 0.30 0.33 0.05 13
11/24 0.42 0.60 0.10 0.14 0.19 0.22 0.25 0.04 10
12/1 0.36 0.50 0.07 0.10 0.13 0.16 0.18 NOV 1.32 0.03 7
12/8 0.31 0.40 0.05 0.07 0.09 0.11 0.12 0.02 5
12/15 0.29 0.40 0.05 0.06 0.09 0.10 0.11 0.02 4
12/22 0.25 0.40 0.04 0.06 0.08 0.09 0.10 0.01 4
12/29 0.21 0.40 0.03 0.05 0.06 0.08 0.09 DEC 0.47 0.01 3
Total 57.90 20.91 28.75 39.20 47.05 52.27 52.27
Almond ET -- Minimal Cover Crop, MIcrosprinkler
(inches, S. San Joaquin Valley)
Monthly
Total
ET Estimates Using CIMIS Zone 15 Southern SJV "Historic" ETo (1st published 2002)
Normal
Year
Grass
Mature
Crop
Coef-
20X22
Spacing
Gallon /
Week
ETo
(in)
ficient
(Kc)
1st Leaf
@ 40%
2nd Leaf
@ 55%
3rd Leaf
@ 75%
4th Leaf
@ 90% Mature
Daily
Avg
day /
tree
1/6 0.21 0.40 0.03 0.05 0.06 0.08 0.09 0.01 3
1/13 0.28 0.40 0.04 0.06 0.08 0.10 0.11 0.02 4
1/20 0.30 0.40 0.05 0.07 0.09 0.11 0.12 0.02 5
1/27 0.36 0.40 0.06 0.08 0.11 0.13 0.14 JAN 0.46 0.02 6
2/3 0.42 0.40 0.07 0.09 0.13 0.15 0.17 0.02 7
2/10 0.47 0.40 0.08 0.10 0.14 0.17 0.19 0.03 7
2/17 0.54 0.40 0.09 0.12 0.16 0.19 0.22 0.03 8
2/24 0.61 0.40 0.10 0.13 0.18 0.22 0.24 0.03 10
3/3 0.69 0.42 0.12 0.16 0.22 0.26 0.29 FEB 1.02 0.04 11
3/10 0.79 0.61 0.19 0.27 0.36 0.43 0.48 0.07 19
3/17 0.89 0.64 0.23 0.31 0.43 0.51 0.57 0.08 22
3/24 0.98 0.67 0.26 0.36 0.49 0.59 0.65 0.09 26
3/31 1.09 0.72 0.31 0.43 0.59 0.70 0.78 MAR 2.57 0.11 31
4/7 1.19 0.74 0.35 0.48 0.66 0.79 0.88 0.13 35
4/14 1.32 0.75 0.40 0.55 0.74 0.89 0.99 0.14 39
4/21 1.41 0.81 0.46 0.63 0.85 1.03 1.14 0.16 45
4/28 1.49 0.83 0.50 0.68 0.93 1.12 1.24 APR 4.64 0.18 49
5/5 1.59 0.86 0.55 0.75 1.03 1.23 1.37 0.20 54
5/12 1.66 0.90 0.60 0.83 1.13 1.35 1.50 0.21 59
5/19 1.73 0.94 0.65 0.89 1.22 1.46 1.63 0.23 64
5/26 1.78 0.96 0.69 0.94 1.29 1.54 1.72 0.25 67
6/2 1.85 0.98 0.72 0.99 1.35 1.62 1.80 MAY 7.15 0.26 71
6/9 1.86 0.99 0.73 1.01 1.38 1.65 1.83 0.26 72
6/16 1.90 1.02 0.77 1.06 1.45 1.74 1.93 0.28 76
6/23 1.93 1.05 0.81 1.11 1.52 1.82 2.03 0.29 79
6/30 1.93 1.06 0.82 1.13 1.54 1.85 2.05 JUN 8.36 0.29 80
7/7 1.93 1.08 0.83 1.14 1.56 1.87 2.07 0.30 81
7/14 1.93 1.08 0.83 1.14 1.56 1.87 2.07 0.30 81
7/21 1.86 1.08 0.80 1.10 1.50 1.80 2.00 0.29 78
7/28 1.86 1.07 0.80 1.10 1.50 1.79 1.99 JUL 8.96 0.28 78
8/4 1.78 1.07 0.77 1.05 1.44 1.72 1.91 0.27 75
8/11 1.75 1.08 0.76 1.04 1.42 1.70 1.89 0.27 74
8/18 1.69 1.08 0.73 1.00 1.36 1.64 1.82 0.26 71
8/25 1.62 1.07 0.70 0.96 1.30 1.57 1.74 0.25 68
9/1 1.55 1.07 0.66 0.91 1.24 1.49 1.66 AUG 7.96 0.24 65
9/8 1.47 1.06 0.62 0.85 1.17 1.40 1.55 0.22 61
9/15 1.40 1.04 0.58 0.80 1.08 1.30 1.45 0.21 57
9/22 1.31 1.02 0.53 0.73 1.00 1.19 1.33 0.19 52
9/29 1.19 0.97 0.46 0.64 0.87 1.04 1.16 SEP 5.87 0.17 45
10/6 1.10 0.95 0.42 0.57 0.78 0.94 1.04 0.15 41
10/13 1.00 0.88 0.35 0.48 0.66 0.79 0.88 0.13 35
10/20 0.90 0.88 0.32 0.43 0.59 0.71 0.79 0.11 31
10/27 0.77 0.83 0.26 0.35 0.48 0.58 0.64 OCT 3.49 0.09 25
11/3 0.67 0.78 0.21 0.29 0.39 0.47 0.53 0.08 21
11/10 0.57 0.71 0.16 0.22 0.31 0.37 0.41 0.06 16
11/17 0.48 0.68 0.13 0.18 0.25 0.30 0.33 0.05 13
11/24 0.42 0.60 0.10 0.14 0.19 0.22 0.25 0.04 10
12/1 0.36 0.50 0.07 0.10 0.13 0.16 0.18 NOV 1.32 0.03 7
12/8 0.31 0.40 0.05 0.07 0.09 0.11 0.12 0.02 5
12/15 0.29 0.40 0.05 0.06 0.09 0.10 0.11 0.02 4
12/22 0.25 0.40 0.04 0.06 0.08 0.09 0.10 0.01 4
12/29 0.21 0.40 0.03 0.05 0.06 0.08 0.09 DEC 0.47 0.01 3
Total 57.90 20.91 28.75 39.20 47.05 52.27 52.27
Almond ET -- Minimal Cover Crop, MIcrosprinkler
(inches, S. San Joaquin Valley)
Monthly
Total
Google:
“cekern
irrigation
almond ET”
for Kc / ET
table.
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22
Weekly crop report on ETc for Kern – courtesy of DWR and UCCE
(available for Fresno and Tehema also, others maybe coming)
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Changes in
Almond Kc / ET
Estimates Over
50 Years
1965
2002
2012
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24
Do you
get 6,000
lb/ac with
60” ET?(Brown
fertility trials,
275 lb/ac N
yields)0
1000
2000
3000
4000
5000
6000
48 50 52 54 56 58 60 62 64
Sin
gle
Tre
e K
ern
al Y
ield
(lb
/ac)
Single Tree Yearly ET by Soil Water Depletion (in)
2008
2009
2010
2011
2012
2010
20082009
2011
2012
1200 – 1600 mm ET
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Almon
d yield
by light
(PAR)
&
water
(Courtesy of
Bruce
Lampenin) Multi year plot averages
Single year orchard or plot averages
Single tree reps
Multi year plot averages
Single year orchard or plot averages
Single tree reps
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Correlation of 2016 Nonpareil yield with applied
water improved 2x to 0.51
y = 27.286x + 1781R² = 0.5129
1500
2000
2500
3000
3500
4000
4500
20 30 40 50 60 70 80
Ker
nel
Yie
ld (
lb/a
c)
Applied Irrigation + Precip Jan 20 - Oct 28 (inches)
Nonpareil Kernel Yield 8/16/2016
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y = 6.6033x + 65.416R² = 0.7271
200
250
300
350
400
450
500
550
600
30 40 50 60 70
Avg
Co
nd
uct
an
ce 3
/25
-9/2
2/2
01
5
(mm
olH
2O
/m^
2/s
ec
2015 Irrigation + Rain (1/27-11/14, inches)
Applied Inches vs. Avg COND
Canopy Temp/Water Stress by Irrigation Treatment
(CERES Spectral Imaging 6/17/2015)
AERIAL IMAGERY CAN IDENTIFY
IRRIGATION/STRESS NON-UNIFORMITY
GALCON GALLILEO
CONTROLLER
Ca
no
py
70
%
80
%
90
%
So
il M
ois
ture
Hu
ll S
plit
RD
I
10
0%
11
0%
Ca
no
py
80
%
So
il M
ois
ture
11
0%
10
0%
Hu
ll S
plit
RD
I
90
%
70
%
Ca
no
py
So
il M
ois
ture
80
%
11
0%
10
0%
Hu
ll S
plit
RD
I
90
%
70
%
Ca
no
py
70
%
80
%
90
%
So
il M
ois
ture
Hu
ll S
plit
RD
I
10
0%
11
0%
Ca
no
py
So
il M
ois
ture
11
0%
10
0%
70
%
80
%
90
%
Hu
ll S
plit
RD
I
Ca
no
py
80
%
11
0%
10
0%
Hu
ll S
plit
RD
I
90
%
70
%
BLOCK 6
BLOCK 1 BLOCK 2
BLOCK3
BLOCK 4
BLOCK 5
18 7 6 5 4 3 2
169 10 11 12 13 14 15
1724 23 22 21 20 19 18
3225 26 27 28 29 30 31
3340 39 38 37 36 35 34
4841 42 43 44 45 46 47
50
49
So
il M
ois
ture
(ex
tra
big
plo
t)
PULSE ------->
CONTINUOS ------->
PULSE ------->
<------ PULSE ------>
CONTINUOS ------->
CONTINUOS ------->
70
%
80
%
90
%
Hu
ll S
plit
RD
I
Ca
no
py
So
il M
ois
ture
10
0%
11
0%
3/25-9/22/2015 average almond plot CONDUCTANCE
by 2015 applied irrigation (10 flyovers)
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Equipment for making irrigation decisions
•Most Common Method – Use a sharper tool!
![Page 29: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/29.jpg)
3 foot push or slide
hammer probe ($150-$250)
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Dendrometers track small
changes in tree water stress and
trunk growth – utilizing and
integrating the relative stress
throughout the rootzone.
High quality/continuously reading soil moist-
ure sensors (capacitance, TDR, tensiometric)
track the adequacy of refill and leaching.
In-field weather stations combined with
flowmeters track the daily water balance.
![Page 31: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/31.jpg)
Technology is helpful, but the
most valuable thing you can
put in the field is your shadow.
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•Cheap water, good prices, no soil sealing: not a big
payback on “saved water”…
•$60 water, on 150 acres: 6” = $4,500
•$100 water on 150 acres: 6” = $7,500
•$1000 water on 150 acres: 6” = $75,000
•500 lb/ac kernals on 150 acs:
@ $2 net after harvest costs = $150,000
SOME SIMPLE ECONOMIC CONCLUSIONS:
1) There is no perfect number for almond Kc or ET
2) A tree may yield 5,000 lb/ac on 50, 60 or 70” in the SJV
3) Real-time monitoring is the only way to insure minimum
stress and maximum efficiency and yield.
![Page 33: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/33.jpg)
Andrew McElrone,
USDA-ARS, Davis
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Development of Surface Renewal Technology
Goal: Create a cost-effective tool to measure actual water loss from vineyard surfaces
Potential site-specific replacement for CIMIS & Kc’s
Collaborators: Paw U, Snyder, Williams, BattanyStudent/Post Docs: Shapland, Calderon, Parry
Funding: J Lohr Vineyards, NIFA-SCRI, AVF, USDA
Andrew J. McElrone
![Page 35: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/35.jpg)
=Net
Radiation + +Ground
Heat Flux
Sensible Heat Flux
Latent Heat Flux
Surface Energy Balance: Partitioning of energy at the surface
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Surface Renewal Technology Development
Successfully removed the need for calibration of Surface Renewal against Eddy Covariance
theoretical
actual
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Eddy Covariance ~$10,000
New Surface Renewal~$200
New Surface Renewal System: A reliable & automated ET measurement system
Mimicked Arduino for programming ease
![Page 38: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/38.jpg)
Kearney Agricultural CenterUniv. of California- Parlier CA
Proof of concept: Compare to lysimeter & eddy covariance (both gold standards)
![Page 39: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/39.jpg)
Surface Renewal vs. LysimeterKearney Ag Center- 2012 & 2013
![Page 40: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/40.jpg)
In past several years, measured in 10+ plots within wine and table grape vineyards; slopes range from 0.9 - 1.05
Esparto Vineyard: 3 plots, 3 irrigation trts
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Surface Renewal vs. Soil Water Budget Kearney Ag Center- 2012 & 2013
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How to use the technology?
Example #1: Amount lost = amount applied
• Not possible previously on a site by site basis• As if there is a weighing lysimeter at each site
• Automated reports to users- layered approach• One, simple actionable number: Pump run
time
![Page 43: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/43.jpg)
Overwatering
How to use the technology?
Example #2: Targeted deficit based on effective water use
Measured by Surface Renewal
Cu
mu
lati
ve E
T a
or
Cu
mu
lati
ve Ir
riga
tio
n (
L vi
ne-1
)Wet Treatment
![Page 44: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/44.jpg)
Steadydeficit
How to use the technology?
Example #2: Targeted deficit based on effective water use
Measured by Surface Renewal
Cu
mu
lati
ve E
T a
or
Cu
mu
lati
ve Ir
riga
tio
n (
L vi
ne-1
)Medium Treatment
![Page 45: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/45.jpg)
Increasingdeficit
How to use the technology?
Example #2: Targeted deficit based on effective water use
Measured by Surface Renewal
Cu
mu
lati
ve E
T a
or
Cu
mu
lati
ve Ir
riga
tio
n (
L vi
ne-1
)Dry Treatment
![Page 46: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/46.jpg)
Lysimeter Vineyard-Kearney Ag Center
During stress, vines can’t keep up with demand from atmosphere
Measure water use AND vine stress
y=0.59x + 1.32 R2=0.69; P<0.0001
![Page 47: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/47.jpg)
Paso Robles- J Lohr Cabernet Sauvignon
July 9 Sept 7
-1.36 MPa-1.61 MPa
-1.35 MPa
-1.63 MPa
-1.65 MPa
Measure water use AND vine stress
![Page 48: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/48.jpg)
• Licensing patented technology from UC Davis• Fundamental work with applied results in ~6 yrs• In 2016, >1000 stations across varied crops
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Alternative automated methods/ technologies to track stress
Infrared Radiometers (IRTs): used to measure plant canopy temperatures for plant water stress estimation
![Page 50: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/50.jpg)
Alternative automated methods/ technologies to track stress
Infrared Radiometers (IRTs): used to measure plant canopy temperatures for plant water stress estimation
Crop Water Stress Index or
Stomatal Conductance Ratio
Plant temp can indicate water stress-when stomata close and leaf temps
increase
![Page 51: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/51.jpg)
Acknowledgements
• Jim Ayars- USDA-ARS
• Felipe Barrios Masias- UC Davis
• Mark Battany- UC ANR
• Daniel Bosch- Constellation Brands
• Arturo Calderon- UC Davis
• Sean Castorani- ARS Davis
• Nick Dokoozlian- E&J Gallo
• Ashley Eustis- USDA-ARS
• Kevin Fort- UC Davis
• Jerry Lohr- Grower Cooperator
• Kyaw Tha Paw U- UC Davis
• Jean Mari Peltier- NGWI
• Anji Perry- J Lohr V&W
• Rod Scheaffer- Constellation
Brands
• Tom Shapland- UC Davis
• Ruby Stahel- USDA-ARS
• Rick Snyder- UC Davis
• Gwen Tindula- UC ANR
• Yannis Toutountzis- Constellation
Brands
• Vlade Tudor- Tudor Farms
• Andy Walker- UC Davis
• Larry Williams- UC Davis
• Andrew Zaninovich- Sunview
Vineyards
• Funding Sources:– J. Lohr Vineyards and Wines
– American Vineyard Foundation
– National Grape and Wine Initiative
– NIFA-Specialty Crops Research Initiative
– USDA-ARS Sustainable Vit CRIS
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Allan Fulton,
UCCE – Tehama County
![Page 53: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/53.jpg)
Turning Orchard Variability into
Opportunity
Allan Fulton
Farm Advisor, UC Cooperative Extension
Tehama, Glenn, Colusa, and Shasta Counties
Topics:
• What are the opportunities?
• Tools to help understand orchard variability
• Introduce zone irrigation concept
![Page 54: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/54.jpg)
1993 – almonds, soon after planting Almonds, approximately 10 years after planting
Almonds, approximately 20 years after planting Opportunities if variability can be managed:
• Increase long term average yieldo Twelve years after planting, potential of 400 to 1000
lbs/ac/yr more yield across 87 percent of this orchard
• More uniform crop developmento Assist pest management (root diseases, hull split
sprays, mites, weed control)o Improve harvestability and reduce shaker injury
• Greater efficiency – More production per unit of water, energy, N, bees, and $$$
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Soil diagnostic tools to help understand causes of orchard variability
Electromagnetic (EM) soil sensors
Electrical conductivity soil sensors (Veris)
Sensors measure ECa
• Apparent EC of soil depends ono Textureo Structureo Moistureo Salinityo Other properties
Serpentine travel pattern
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Percent gravel, sand, silt, and clay in relation to ECa (mS/m) measured with EM38 in almond orchard
0
20
40
60
80
30 40 50 60 70
Perc
ent
grav
el
ECa (mS/m)
0
20
40
60
80
30 40 50 60 70
Perc
ent
san
d
ECa (mS/m)
0
20
40
60
80
30 40 50 60 70
Perc
ent
silt
ECa (mS/m)
0
20
40
60
80
30 40 50 60 70
Perc
ent
clay
ECa (mS/m)
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Alm
on
d y
ield
(lb
s/
acr
e)
Zone
VERISEM38
987654321987654321
4000
3500
3000
2500
2000
EM38 variability map for almond orchard – Four soil zones
Veris variability map for almond orchard – Nine soil zones
Almonds, approximately 10 years after plantingLong-term almond yields in respective soil zones
identified with EM38 and Veris mapping methods
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Zone or variable rate irrigation concept
Soil variability map (Veris)
Zone irrigation design to match soil variability
![Page 59: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/59.jpg)
Kent Stenderup,
Stenderup Ag Partners
![Page 60: Precision Irrigation Management: What’s Now and …...Precision Irrigation Management: What’s Now and What’s New (Part 2)Bob Curtis, Almond Board of California (Moderator) Blake](https://reader030.fdocuments.in/reader030/viewer/2022040406/5ea0c0a8ef1d223e4851e410/html5/thumbnails/60.jpg)
Variable Rate IrrigationKent Stenderup, Arvin, CA
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Discovery, Design and Implementation
•Veris
•Aerial Imagery, Infrared
•Soil Analysis
•Irrigation System Type
•Real-time Soil Moisture Sensors by Zone
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3 Distinct Soil Types
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Irrigation System Design
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Zone Change Soil Moisture Monitoring
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Arvin, California
The Garden in the Sun
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Questions?