Irrigation and Nitrogen Irrigation and Nitrogen Management Systems for Management Systems for Enhancing Hard Spring Wheat Enhancing Hard Spring Wheat Protein Protein J. Stark, E. Souza, B. Brown, and J. J. Stark, E. Souza, B. Brown, and J. Windes Windes University of Idaho University of Idaho
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Irrigation and Nitrogen Management Systems for Enhancing Hard Spring Wheat Protein J. Stark, E. Souza, B. Brown, and J. Windes University of Idaho.
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Irrigation and Nitrogen Management Irrigation and Nitrogen Management Systems for Enhancing Hard Spring Systems for Enhancing Hard Spring
Wheat ProteinWheat Protein
Irrigation and Nitrogen Management Irrigation and Nitrogen Management Systems for Enhancing Hard Spring Systems for Enhancing Hard Spring
Wheat ProteinWheat Protein
J. Stark, E. Souza, B. Brown, and J. WindesJ. Stark, E. Souza, B. Brown, and J. Windes
University of IdahoUniversity of Idaho
Factors Affecting Grain Protein Factors Affecting Grain Protein ConcentrationConcentration and Qualityand Quality
Factors Affecting Grain Protein Factors Affecting Grain Protein ConcentrationConcentration and Qualityand Quality
FertilityFertilityWaterWater
TemperatureTemperature??
VarietyVariety
906-R 1986906-R 1986
13
13.5
14
14.5
15
15.5
Check Preplant Jointing Flowering
0 kg N/ha180 kg N/ha245 kg N/ha
Gra
in P
rote
in (
%)
Gra
in P
rote
in (
%)
1989 - Pondera1989 - Pondera
11
12
13
14
15
16
0 67 134 201
0 kgN/ha22 kg N/ha44 kgN/ha
Gra
in P
rote
in (
%)
Gra
in P
rote
in (
%)
Preplant Nitrogen (kg N/ha)
Increase in Flag Leaf Nitrogen Resulting Increase in Flag Leaf Nitrogen Resulting From Topdress Nitrogen at HeadingFrom Topdress Nitrogen at Heading
20 lbs N/acre20 lbs N/acre y =1.65-0.37x ry =1.65-0.37x r22= 0.83= 0.83
40 lbs N/acre40 lbs N/acre y =2.48-0.55x ry =2.48-0.55x r22=0.90=0.90
Flag Leaf Nitrogen vs Protein, Flag Leaf Nitrogen vs Protein, Aberdeen, 1989 - 1991Aberdeen, 1989 - 1991
91011121314151617
2.2 2.7 3.2 3.7 4.2
Flag Leaf Nitrogen at Milk Stage (%)
Gra
in P
rote
in (
%)
Gra
in P
rote
in (
%) Pondera
y = 7.47+1.79x r2=0.85
Copper y = 6.15+1.88x r2=0.85
Increase in Grain Protein (%) as Related to Increase in Grain Protein (%) as Related to Topdress Nitrogen and Flag Leaf Nitrogen at Topdress Nitrogen and Flag Leaf Nitrogen at
HeadingHeading
-0.5
0
0.5
1
1.5
2
2.5
3In
crea
se in
Gra
in P
rote
in (
%)
Incr
ease
in G
rain
Pro
tein
(%
)
Flag Leaf Nitrogen at Heading (%)
20 lbs N/acre20 lbs N/acre y =1.81-0.40x ry =1.81-0.40x r22= 0.86= 0.86
40 lbs N/acre40 lbs N/acre y =2.52-0.56x ry =2.52-0.56x r22=0.88=0.88
Change in Test Weight With Change in Test Weight With Timing of Irrigation Cut-offTiming of Irrigation Cut-off
72737475767778798081
112 202 291 381
MilkEarly doughSoft dough
Nitrogen Rate (kg N haNitrogen Rate (kg N ha-1-1))
Tes
t W
eigh
t (k
g h
LT
est
Wei
ght
(kg
hL --
11))
Std.err. = 0.5
Change in Kernel Weight With Change in Kernel Weight With Timing of Irrigation Cut-offTiming of Irrigation Cut-off
30
32
34
36
38
40
42
44
112 202 291 381
MilkEarly doughSoft dough
Nitrogen Rate (kg N haNitrogen Rate (kg N ha-1-1))
Ker
nel
Wei
ght
Ker
nel
Wei
ght
(mg)
(mg)
Std.err. = 1.7
Change in Flour Yield With Change in Flour Yield With Timing of Irrigation Cut-offTiming of Irrigation Cut-off
62
63
64
65
66
67
112 202 291 381
MilkEarly doughSoft dough
Flo
ur
Yie
ld
Flo
ur
Yie
ld
(%)
(%)
Nitrogen Rate (kg N ha-1) Std.err. = 1.0
Flour Yield to Protein Ratios Over Flour Yield to Protein Ratios Over Three Irrigation TreatmentsThree Irrigation Treatments
Flo
ur
Yie
ld (
g k
gF
lou
r Y
ield
(g
kg-1-1
))
Flour Protein (%)Flour Protein (%)
620
630
640
650
660
670
10.5 11 11.5 12 12.5 13
earlyearly
moderatemoderate
optimaloptimal
Change in Loaf Volume With Change in Loaf Volume With Timing of Irrigation Cut-offTiming of Irrigation Cut-off
900
950
1000
1050
1100
1150
1200
112 202 291 381
MilkEarly doughSoft dough
Nitrogen Rate (kg N haNitrogen Rate (kg N ha-1-1))
Loa
f V
olu
me
Loa
f V
olu
me
(mL
)(m
L)
Std.err. = 32
Loaf Volume to Protein Ratios Over Loaf Volume to Protein Ratios Over Three Irrigation TreatmentsThree Irrigation Treatments
Loa
f V
olu
me
(mL
)L
oaf
Vol
um
e (m
L)
Flour Protein (%)Flour Protein (%)
950
1000
1050
1100
1150
10.5 11 11.5 12 12.5 13
earlyearly
moderatemoderate
optimaloptimal
HRS Response to Late Season N as HRS Response to Late Season N as Affected by Moisture During Grain FillAffected by Moisture During Grain Fill
1995, 1996, 1997, 19981995, 1996, 1997, 1998
TreatmentsTreatmentsEarly Season N: 67, 134 kg/haEarly Season N: 67, 134 kg/haMid Season N: 0, 44, 88 kg/haMid Season N: 0, 44, 88 kg/ha
Late Season Water: 0, 0.5, 1.0 x ETLate Season Water: 0, 0.5, 1.0 x ET
RCB - Four ReplicationsRCB - Four Replications
Late Season Water (% ET)
0.0 0.5 1.0
Yie
ld (
kg/h
a)
0
20
40
60
80
100
120
95
97
96
98
Preplant N = 134 kg/ / / ha
I
I
I
I
Late Season Water (ET)
0.0 0.5 1.0
Pro
tein
(%
)
12
13
14
15
16
17
18N at Heading = 0
I
I
I
95
97
96
98I
0 45 90
Pro
tein
(%
)
12
13
14
15
16
17
18
N at Heading (kg ha-1)
0 45 90 0 45 900 45 90
II I I
Early Season N
67 kg ha-1
135 kg ha-1
1995 1996 1997 1998
0 45 90
Pro
tein
(%
)
12
13
14
15
16
17
18
Late Season N at Heading (kg ha-1)
0 45 90 0 45 90
I I
0 45 90
12
13
14
15
16
17
18
I
I
Water Added 0 % ET0.5 % ET1.0 % ET
19951996
1997 1998
0 45 90
Bak
e Vo
lum
e (c
m3)
900
1000
1100
1200
1300
Late Season N at Heading (kg ha-1)
0 45 90 0 45 90
II
I
Water Added
0 % ET0.5 % ET1.0 % ET
0 45 90
I
1995 1996 1997 1998
60
65
70
75
80
85
90
95
100
0 45 90
1995199619971998
Late Season N Rate (kg/ha)
Vol
ume/
Pro
tein
Rat
io
60
65
70
75
80
85
90
95
100
0 0.5 1
1995199619971998
Fraction of ET Applied
Vol
ume/
Pro
tein
Rat
io
ConclusionsConclusions
Additional nitrogen applied from boot stage to Additional nitrogen applied from boot stage to heading will increase flag leaf nitrogen, grain heading will increase flag leaf nitrogen, grain protein and flour protein when nitrogen levels protein and flour protein when nitrogen levels are less than optimal.are less than optimal.
There is a greater response in grain protein to There is a greater response in grain protein to late-applied nitrogen with larger deficits of late-applied nitrogen with larger deficits of plant nitrogen.plant nitrogen.
ConclusionsConclusions
Loaf volume is directly related to protein Loaf volume is directly related to protein concentration within years.concentration within years.
The loaf volume to grain protein ratios are not The loaf volume to grain protein ratios are not affected by topdress timing and only slightly by late affected by topdress timing and only slightly by late season N.season N.
Early termination of irrigation increases grain Early termination of irrigation increases grain protein, but decreases kernel weight, grain yield, test protein, but decreases kernel weight, grain yield, test weight, and flour yield.weight, and flour yield.
Early termination of irrigation did not change loaf Early termination of irrigation did not change loaf volume to flour protein ratios but moisture deficit volume to flour protein ratios but moisture deficit throughout grain filling reduced the ratio.throughout grain filling reduced the ratio.
ConclusionConclusion
Inducing late season moisture stress to enhance Inducing late season moisture stress to enhance protein concentration or quality is a poor strategy.protein concentration or quality is a poor strategy.
Late season N enhanced protein concentration and Late season N enhanced protein concentration and protein increases were associated with improved protein increases were associated with improved baking quality.baking quality.