Download - Greenseeker in Sugar beet
Greenseeker in Sugar beet
John A. Lamb
University of Minnesota
Sugar beet studies
• Objective: Determine if disease resistant varieties differ in response to N.
• Treatments:– Three varieties – susceptible, mod, resistant– Five N rates – 70, 90, 110, 130, 150 soil nitrate-N (0-4
ft.) plus fertilizer.– Three locations– Small plots and field strips– Harvested tops, determined top yield, N conc, and N
uptake.
Sugar beet top results 2004(small plots)
0
50
100
150
200
0.6 0.7 0.8 0.9
NDVI 9/16/04 (Harvest)T
op
N u
pta
ke (
lb/a
cre)
0
2000
4000
6000
8000
10000
0.6 0.7 0.8 0.9
NDVI 9/16/04 (Harvest)
To
p y
ield
(lb
/acr
e)
All locations, varieties, and N rates
0
2000
4000
6000
8000
10000
0.7 0.75 0.8 0.85 0.9
NVDI 9/16/04
To
p y
ield
(lb
/A)
Sugar beet top yield 2004
Y = -13397 + 19142 X r = 0.40**
Y = -11157 + 18705 X r = 0.62**
Y = -11402 + 20665 X r = 0.34*
Does Red Greenseeker work with sugar beet?
NDVI = 0.32 C.V. = 40% NDVI = 0.39 C.V. = 44% NDVI = 0.43 C.V. = 40%
July 13, 2005
Buffalo Lake, MN
2005 measurements
NDVI = 0.64 C.V. = 22% NDVI = 0.76 C.V. = 12%
July 13, 2005
Buffalo Lake, MN
TW Clara City 0 NNDVI = 0.66 C.V. = 10%
TW Clara City 130 NNDVI = 0.84 C.V. = 2%
July 13, 2005
Fall 2005 plans
1.Repeat 2004 sampling.2.Measure spatial differences.
Sugar beet summary
• On an individualized site, there is a linear relationship between NDVI and sugar beet top amount.
• Data needs to be tortured more.
• During early season the Greenseeker does measure biomass of tops
• As NDVI increases, CVs decrease.
Corn information
• Before we did corn work, some modifications to the Greenseeker had to be made.– Hard on back so incorporated a backpack to
carry battery.– Needed better way to get the height in “man”
corn. Used flag pole holder with limited success.
– Tried some bike designs
Backpack and flag pole holder designs.
Bike designs
Corn measurements in 2005
• Corn fertilized in Corn-Sugar beet rotation.
• Treatments – 0, 120, and 200 pounds N/A.
NDVI (2005)
Nrate
lb/A
V6
6/23
V9
6/30
V11
7/6
V14
7/14
0 0.713 0.835 0.835 0.820
120 0.760 0.853 0.853 0.823
200 0.754 0.856 0.855 0.824
Stat ** ** ** NS
Questions?