Almond Irrigation, Water Stress and Productivity: Where do...
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Almond Irrigation, Water Stress and Productivity:
Where do Drought & Deficit Irrigation Research Fit In?
Ken Shackel, UCD Plant SciencesJanuary, 2008
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Some drought irrigation history:
a) 1989 – 1991. Irrigation cutoff & drought recovery trials in Kern Co. on relatively shallow sandy soil (Dave Goldhamer)
b) 1990 – 1995. Irrigaiton cutoff/cutback & drought recovery trials in Manteca on moderate depth sandy loam soil (Terry Prichard)
c) 1993 – 1996. Drought irrigation management trials N. Kern Co. 3' sandy loam (Dave Goldhamer)
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Full ET: 30" – 40" in-seasonYields: 1,700 #/ac Goldhamer study, 1989 - 1991
52 46 39 32 25 18 11 4 PreharvestCutoff (days)
% ET(1991)
(3ed year yield penalty at < 90% ET?)
56 62 68 73 83 88 94 100
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Goldhamer study, 1989 – 1991
Drought recovery
Drought with a 60% reduction – choices:a) use it at full ET until it is gone (long cutoff)b) spread it out for various levels of cutoff
Results: More even spread is best
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Full ET: 37" in-seasonYields: 3,360 #/ac Prichard study, 1990 - 1993
Yield (% Control)Deficit Treatment 1990-1992 1992
(5) Midseason 50 78 79
(4) Mid and Postharvest 52 85 73
(3) Midseason 66 77 80
(6) Plant-based 66 93 96
(2) Postharvest 72 82 84
(1) Control 100 100 100
% ET
No yield loss at 66% ET with season-long plant-based irrigation (predawn WP < -12 bars)
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1993 -1996 study, Southern SJV, 18 year-old orchard
Control (100% ETc)
3 levels of irrigation deficit
3 patterns of deficit A B C
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“C” Seasonal pattern in water application (% of control)
Equal irrigation deficit all season
MARCH APRIL MAY JUNE JULY AUGUST SEPT OCT NOV
C
C
C
C
C
C
(Control = 100% season long, about 42”)
(Target about 34”)
(Target about 28”)
(Target about 23”)
100
90
80
70
60
50
40
30
20
10
0
Date(Goldhamer et al., 2006)
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“B” Seasonal pattern in water application (% of control)
Some deficit early, most deficit post-harvest
B
BB B
BB B
B
B
B
B
0
10
20
30
40
50
60
70
80
90
100
MARCH APRIL MAY JUNE JULY AUGUST SEPT OCT NOV
Date(Goldhamer et al., 2006)
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“C” Seasonal pattern in water application (% of control)
More deficit early, less deficit postharvest
A AA
A A
A
A A
A
A
A
A
A A
A A
A
A
A
A A
A
0
10
20
30
40
50
60
70
80
90
100
MARCH APRIL MAY JUNE JULY AUGUST SEPT OCT NOV
Date(Goldhamer et al., 2006)
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Mean Yield 1993-1996
A
B
C A
B
C
A
BC
2100
2000
1900Kernel Yield
(lbs/ac)1800
20 25 30 35 40
A
B C
A
B
C
A
BC
(100% ETcCONTROL)1700
(ONLY 2 TREATMENTS WITH A SUBSTANTIAL 3ED YEAR REDUCTION)
1600
1500
1.30
1.25
Kernel Size (g/nut) 1.20
1.15
1.10
Seasonal Applied Irrigation (inches)(Goldhamer et al., 2006)
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550
600
650
700
750
800
20 25 30 35 40 45
A
B
C
A
B
C ABCCrop Load
(Thousand nuts/acre)
Seasonal Applied Irrigation (inches)
(Goldhamer et al., 2006)
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Question: is the amount and timing of irrigation all you need toknow to describe the stress experienced by the tree?
A
B
C A
B
C
A
BC
2100
2000
1900Kernel Yield
(lbs/ac)1800
1700
1600
1500
1.30 20 25 30 35 40
Seasonal Applied Irrigation (inches)
(Goldhamer et al., 2006)
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Answer: probably not, maybe better to ask the tree?
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Example of the daily pattern in stem water potential (SWP) in Almonds
(Magnum ranch, Lassen Land Co., August 4, 2005)
SW
P (b
ars)
-30
-25
-20
-15
-10
-5
0
4:00 6:00 8:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 24:00
(MIDDAY SWP)
(Wetter condition)
(Drier condition)
Local time
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Midday SWP values in Almond
0
-5
(Minimal stress) Expected range even under fully irrigated conditions
-10
(Mild stress)Will reduce overall growth of young trees, and shoot
growth of older trees, but may also have some beneficial effects on older trees
(Moderate stress)
Interior leaf yellowing and drop usually apparent. Not unusual to find under almond production
conditions, but probably reduces tree productivity, particularly if these levels occur regularly
SW
P (B
ars) -15
-20
-25
(Severe stress)Leaf drop, flagging, wilting. Can occur under
almond production conditions, particularly around harvest.
-30
-35
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Goldhamer study, predawn water potential
23”, C
34”, C
APR JUN JUL AUGMAY SEP OCT
-35
-30
-25
-20
-15
-10
-5
0Pr
edaw
nle
af w
ater
pot
entia
l (ba
rs)
(Goldhamer et al., 2006)
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Midday SWP values in Almond
0
-5
(Minimal stress) Expected range even under fully irrigated conditions
-10
(Mild stress)Will reduce overall growth of young trees, and shoot
growth of older trees, but may also have some beneficial effects on older trees
(Moderate stress)
Interior leaf yellowing and drop usually apparent. Not unusual to find under almond production
conditions, but probably reduces tree productivity, particularly if these levels occur regularly
SW
P (B
ars) -15
-20
-25
(Severe stress)Leaf drop, flagging, wilting. Can occur under
almond production conditions, particularly around harvest.
-30
-35
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Example: Midday stem water potential (bars) in 2006,Lampinen et al., Spur Dynamics
April May June July Aug Sep
-35
-30
-25
-20
-15
-10
-5
0
Date, 2006
Oct
T1 (high water, high N), Seasonal mean = -10.9 bars
T2 (high water, mod. N), Seasonal mean = -11.0 bars
T3 (mod. water high N), Seasonal mean = -13.6 bars
T4 (mod. water mod. N), Seasonal mean = -13.7 bars
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Lampinen study, canopy development (5th leaf – 11th leaf orchard)
Year
2000 2001 2002 2003 2004 2005 2006 2007
20
40
60
80
high water, high N
high water, mod. N
mod. water, high N
mod. water, mod. N
Seasonal average midday light
interception (%)
(Lampinen study)
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Midday light interception (%)
Ker
nel y
ield
(lbs
/acr
e)
6000WalnutAlmond- Nonpareil Spur DynamicsAlmond- Nonpareil RAVTsAlmond- Nonpareil- Duncan trial
5000
4000
3000
2000
1000
0
0 20 40 60 80 100Midday light interception (%)
(Lampinen study)
• Canopy development determines yield potential
• Approximately 10% loss in rate of canopy development per bar ofseasonal average midday stem water potential deficit
Conclusions:
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Midday light interception (%)
Ker
nel y
ield
(lbs
/acr
e)
6000WalnutAlmond- Nonpareil Spur DynamicsAlmond- Nonpareil RAVTsAlmond- Nonpareil- Duncan trial
5000
4000
3000
CC C2000
1000
0
0 20 40 60 80 100Midday light interception (%)
•Canopy development determines yield potential
•Approximately 10% loss in rate of canopy development per bar of seasonal average midday stem water potential deficit
(Lampinen study)
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Goldhamer study, predawn water potential
23”, C
34”, C
APR JUN JUL AUGMAY SEP OCT
-35
-30
-25
-20
-15
-10
-5
0Pr
edaw
nle
af w
ater
pot
entia
l (ba
rs)
(Goldhamer et al., 2006)
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Question: Is it possible that stress can be determined by factors other than irrigation amount and timing?
Answer: Yes – we have a good example of a non-uniform field that required substantial irrigation compensation to make it uniform.
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(Almonds)
EXPERIMENTAL PLOT
Corning locationFarm Advisors: Allan Fulton, Rick BuchnerGrower: Brian Crane, Crane-Mills, Corning, CASystem: microsprinklerBomber: Cayle Little
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WEST(gravel)
EAST(silt)
5-9-02
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% Hull Split, Carmel variety(East/West difference similar in all varieties)
Date, 2000
10 Aug 16 Aug 22 Aug 31 Aug 6 Sep 14 Sep
East(Average SWP =
-8.4 bars)0% 0% 5% 13% 32% 40%
West(Average SWP =
-14.1 bars)4% 23% 60% 83% 85% 91%
Problems with uneven hull split timing:
- Uncertain timing for hull split spray - Irrigation management problems- Uneven/delayed harvest
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NonPareil variety (Corning) – Hull Split (RDI treatment)
1007555252% HS
AUG 13
AUG 1
JUL 27
JUL 20
JUL 13
DateWest (gravel)
1007045202% HS
AUG 13
AUG 1
JUL 27
JUL 20
JUL 13
DateEast (silt)
2001:
1001009629% HS
Date AUG 22
AUG 15
AUG 7
JUL 29East (silt)
2003:
1001008829% HS
Date AUG 22
AUG 15
AUG 7
JUL 29West (gravel)
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Corning location –irrigation summary (RDI)
2002 2003 2004Water
appliedCutoff date
Water applied
Cutoff date
Water applied
Cutback date
East (silt) 24” 10-Jul 14” 1-Jul 18” 7-JunWest
(gravel) 40” 25-Aug 41” 4-Sep 36” 16-Sep
ETc 43” 40” 42”
Soil
Very long cutoff/cutback OK on East (silt) soil
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2001 - 2004 Almond RDI sites:
County Location Soil type Age (yr) IrrigationTehama Corning(E) Silt-Loam 9 MicrosprinklerTehama Corning (W) Gravel-Loam 9 MicrosprinklerButte Chico Vina-Loam 9 Solid-set Sprinkler
Colusa Arbuckle Gravel-Loam (II) 13 Single line dripSolano Dixon Yolo-S/CLoam 8 Solid-set SprinklerMadera Madera Dinuba FSL 10 Microsprinkler
Kern Shafter Sandy Loam 15 Microsprinkler
Question: Can we use RDI in the same location(s) over many years without reducing yield?
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Four year yield summary
(lbs. nutmeats per acre)
2001 2002 2003 2004
Treatment (2 sites) (7 sites) (7 sites) (7 sites)
Grower 2,400 3,170 2,860 2,650
RDI 2,430 3,080 2,660 2,680
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Selected sites where differences in stressonly occurred during hull split
(15 “paired” comparisons)
Irrigation Treatment
(Measured Value) Grower RDI
SWP (bar) -11.1 ± 1.7 -14.7 ± 2.1
Yield (lbs/ac) 2,812 ± 787 2,858 ± 751
Nut Size (g) 1.22 ± 0.19 1.21 ± 0.20
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Four year (2001 – 2004) harvest effects summary
Hull rot (strikes/tree)
Location Grower RDI
Corning(silt) 0.0 0.0 5
Corning(gravel) 0.0 0.0 6
Chico 1.1 2.2 0
Arbuckle 0.0 0.0 0Dixon 4.4 2.4 1 60% mummy reduction, '02
Madera 20.1 5.1 4 Grower required 2 shakes, '02Kern 24.0 17.5 0 50% sticktight reduction, '03, '04
Days RDI advance in
HS Other effects
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Magnum Ranch, Lassen Land co. RDI study.
Nutmeat yields, 2004 - 20074000
CONTROL
RDI
Lbs. nutmeats/acre
0
1000
2000
3000
2004 2005 2006 2007
YEAR
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Benefits of RDI (mild stress)for almonds during hull split:
1) Speed up Hull Split (use water as a management tool)
2) Reduce Hull rot3) Reduce Sticktights (Improve Harvestability)4) Save Water5) No negative impact on yield