Plant Specific Fertilization NUEWorkshop Paul Hodgen.
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Transcript of Plant Specific Fertilization NUEWorkshop Paul Hodgen.
![Page 1: Plant Specific Fertilization NUEWorkshop Paul Hodgen.](https://reader034.fdocuments.in/reader034/viewer/2022051717/5a4d1b687f8b9ab0599b1f66/html5/thumbnails/1.jpg)
Plant Specific Fertilization
NUE Workshop
Paul Hodgen
![Page 2: Plant Specific Fertilization NUEWorkshop Paul Hodgen.](https://reader034.fdocuments.in/reader034/viewer/2022051717/5a4d1b687f8b9ab0599b1f66/html5/thumbnails/2.jpg)
Plant specific Fertilization
If we could fertilize each plant, how much could be stolen by the neighbors shortly
after application?
Where does the newly taken up N go in the plant?
![Page 3: Plant Specific Fertilization NUEWorkshop Paul Hodgen.](https://reader034.fdocuments.in/reader034/viewer/2022051717/5a4d1b687f8b9ab0599b1f66/html5/thumbnails/3.jpg)
The Experiment- Applied 1.2 g of depleted N Ammonia Nitrate
(AN) (34-0-0) 15 cm below one plant.- Applied 1.2 g of regular N of AN 15 cm below
the 4 neighboring plants on each side.- Used a syringe, made a well hole and injected N
source at a 45 degree angle to place directly under each plant.
- N was applied on July 5th(V9) and July 25th(VT)- Plants were harvest on July 15th (V12) and August 1st (R1) respectively.
![Page 4: Plant Specific Fertilization NUEWorkshop Paul Hodgen.](https://reader034.fdocuments.in/reader034/viewer/2022051717/5a4d1b687f8b9ab0599b1f66/html5/thumbnails/4.jpg)
14N NNatural abundanceNNatural abundance
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The Experiment
-Plants were separated into three parts.V9- Top leaf and whorl, Stem, Bottom
Leaves (9 replications)VT- Leaves, Stem and tassel, Immature
Ear(10 replications)
-Forage was dried for 72 hours and weighed.
-Plant Population was 77,500 plant ha-1
-All equipment was cleaned with Ethanol betweenreps.
![Page 6: Plant Specific Fertilization NUEWorkshop Paul Hodgen.](https://reader034.fdocuments.in/reader034/viewer/2022051717/5a4d1b687f8b9ab0599b1f66/html5/thumbnails/6.jpg)
14N NNatural abundanceNNatural abundance
All plants were kept separate until sent for lab analysis. Then the neighboring plants were combined to from one sample for each part.
Plant # 0 1 2 3
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![Page 8: Plant Specific Fertilization NUEWorkshop Paul Hodgen.](https://reader034.fdocuments.in/reader034/viewer/2022051717/5a4d1b687f8b9ab0599b1f66/html5/thumbnails/8.jpg)
![Page 9: Plant Specific Fertilization NUEWorkshop Paul Hodgen.](https://reader034.fdocuments.in/reader034/viewer/2022051717/5a4d1b687f8b9ab0599b1f66/html5/thumbnails/9.jpg)
Results: First Harvest (V12)
H Letters indicate significant difference at the alpha = 0.05 level.
Table 1 : Average biomass data for each plant part of the first harvestVegetation Part Plant location from depleted
source Weight (g)
Leaves
0 64a H1 65a2 66a3 68a
Stem
0 77a1 78a2 81ab3 84b
Top leaf and whorl
0 57a1 57a2 57a3 57a
![Page 10: Plant Specific Fertilization NUEWorkshop Paul Hodgen.](https://reader034.fdocuments.in/reader034/viewer/2022051717/5a4d1b687f8b9ab0599b1f66/html5/thumbnails/10.jpg)
H Letters indicate significant difference at the alpha = 0.05 level.
Table 2 : Average N concentration for each plant part for the first harvest.
Vegetation Part Plant location from depleted source %
Leaves
0 2.1a H1 2.4 b2 2.3ab3 2.3ab
Stem
0 1.3a1 1.1a2 1.1a3 1.0a
Top leaf and whorl
0 2.5a1 2.6a2 2.4a3 2.5a
Results: First Harvest (V12)
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0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0 1 2 3Plant location away from depleted N source
15N
(%)
Bottom Leaves Stem Top leaf and Whorl
AB B B
a
bx
cc
yyz z
Results: 15N concentration First Harvest V12
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0
0.5
1
1.5
2
2.5
3
3.5
0 1 2 3Plant location away from depleted N source
Dep
lete
d N
Upt
ake
(mg)
Bottom Leaves Stem Top leaf and Whorl
B
A
B B
a
bbc
c
x
y
zz
Results: 14N uptake First Harvest V12
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Table 3: Depleted N uptake at V12
plantDepleted N taken UP
(mg) % of total
0 5.7 60
1 2.6 28
2 0.9 10
3 0.2 2
Total 9.5
Results: Depleted N taken up at first harvest V12
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Now lets look at what happens at the start of the Reproductive growth stages
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Results: Second Harvest (R1)
H Letters indicate significant difference at the alpha = 0.05 level.
Table 4: Average biomass data for each plant part for the second harvest.
Vegetation Part Plant location from depleted source Weight (g)
Leaves0 78a H1 79a2 82a3 83a
Stem + Tassel
0 104a1 103a2 112ab3 113b
Ear0 87a1 89ab2 95ab3 96b
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H Letters indicate significant difference at the alpha = 0.05 level.
Table 5 : Average N concentration for each plant part for the first harvest.
Vegetation Part Plant location from depleted source %
Leaves
0 2.6a H1 2.5a2 2.5a3 2.4a
Stem and Tassel
0 0.5a1 0.5a2 0.6a3 0.5a
Ear
0 1.4a1 1.5a2 1.4a3 1.3a
Results: Second Harvest (VT)
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Results: Second Harvest (VT)
H Letters indicate significant difference at the alpha = 0.05 level.
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0 1 2 3Plant location away from depleted N source
15N
(%)
Leaves Stem and Tassel Ear
A B B B
x
y z z
ab c c
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0
0.5
1
1.5
2
2.5
3
3.5
0 1 2 3Plant location away from depleted N source
Dep
lete
d N
Upt
ake
(mg)
Leaves Stem and Tassel Ear
x
yz z
AB B B
ab bb
Results: Second Harvest (VT)
H Letters indicate significant difference at the alpha = 0.05 level.
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Table 3: Depleted N uptake at R1
plantDepleted N taken UP
(mg) % of total
0 2.7 76
1 0.7 20
2 0.2 4
3 0 0
Total 3.5
Results: Depleted N taken up at 2nd harvest R1
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Summary
- N placed under a single plant can be taken up by two neighboring plants.
-5 plants are competing for a same resourcesbelow ground.
- Newly taken up N is shuttled to developing plantstructure.
- Supports the need to insure no early season N stress.
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Questions ??