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The Glory of the farmer is that, in the division of labors, it’s his part to create.
Emerson
Help farmers make some money, and they will share it with you.
Ellsworth Fanning
1 2
Soil Sampling the old fashioned
way
1 2
VL
VH
Medium
H
L
Too Sweet is as bad as too sour
UNDER
UN
DE
R
UNDER
OVER OVE
R
OVER U
ND
ER
OVER is as bad as UNDER
Blanket Rate
Cotton Yield
As pH increased, Cotton Yield decreased
873 – 1082 1083-1194 1195 –1303 1304 – 1421 1422 - 1656
7.6
6.0
6.8
As the pH increased, Yield decreased
Yie
ld (
lbs/
A)
pH
50
60
70
80
90
100
110
120
1301 2 3 4 5 6 7 8 9
6
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
pH
Yield (lbs/A)
Soil pH Zn (ppm)
4.0 412
5.0 4.12
6.0 0.0412
7.0 0.00041
8.0 0.000004
Nutrient availability is pH dependent
5.0 7.5
Mn DeficientMn Toxicity
K Surface Map
404
163
K - Mg Antagonism
Too High K is as detrimental as Too Low K
K – Mg antagonism
% Potassium
% Magnesium
Too Much is as bad as Too Little
High
Low
Too Much P is as bad as Too Little P
P- Zn antagonism
Too Much P is as bad as Too Little P
Cotton
Cotton Yield Map
500 to 1300 lbs/A
You will never be able to eliminate all variability.
You just should manage it as good as you can with the existing technology
Sampling every
2.5 acres
Grid Samplin
g
Larinburg, NC
May 2006
Creating Management
zones by using electrical
conductivity
One pair of coulter-electrodes injects electrical current into the soil, while two other pairs of coulter-electrodes measure the voltage drop.
Two Depth Readings
Shallow 0-12”
Deep0-36”
Electrical Conductivity
How it works…
• Veris travels at regular intervals throughout a field.
• Data is then used to create a Management Zone map.
• Soil Sampling Sites can be placed according to variability.
Veris Machine
Larinburg, NC
May 2006
0 to 12”
Larinburg, NC
May 2006
0 to 36”
Shallow
Deep
Top soil and sub-soil may be somewhat different
Shallow
Deep
Top soil and sub-soil are similar
3 Zones
5 Zones
Larinburg, NC
May 2006
0 to 12”
Yazoo City
4/10/06
EC Map
Vari-Soil
Yazoo City
4/10/06
Vari-Soil
Yazoo City
4/10/06
You can go beyond
VRT
Soil pH
Soil pH
YieldYield
Negative Correlation
Take Home Message
1500 - 2000
NONE
2000 - 3000
500 - 1500
3000 - 5000
Ag Lime
Take the
money from here
Put that money here
It’s all about prioritizing resources
Soil Types
Vari-SoilYield Maps
EC Maps
Organic Matter
NDVI
Green Seeker
Variable Rate N is going to be big
Imagery
Experience
Cotton
Take a little N off
herePut it here
His Legacy is Land. May he find it as beautiful and bountiful as his forefathers did.
““Life is like a dog sled team. Life is like a dog sled team.
If you ain’t the If you ain’t the lead doglead dog, , the scenery never changes.the scenery never changes.”” Lewis GrizzardLewis Grizzard
