EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 1 Evaluation of Green...
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Transcript of EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 1 Evaluation of Green...
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 1
Evaluation of Green SeekerEvaluation of Green Seekerfor Nitrogen Fertilizationfor Nitrogen Fertilizationin Cotton – Preliminaryin Cotton – Preliminaryresults in Alabamaresults in Alabama
Shannon Norwood, Amy Winstead, Shannon Norwood, Amy Winstead, Charles Burmester, Paul Mask, Charles Burmester, Paul Mask, Dale Monks, John Fulton, Joey Dale Monks, John Fulton, Joey Shaw, Brenda OrtizShaw, Brenda Ortiz
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 2
CottonCotton
Experimental DesignExperimental Design
2007-2008-2009 North Alabama (Heavy soils) 4 Treatments
TTsPre-plant Sidedress
N (lbs/ac)N Rich 150 0No sidedress 50 0Standard 70 50High sidedress 50 100
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 3
Experimental DesignExperimental Design
Field strips Field strips (8 rows x length of the field) Ramped calibration strip in the N Rich – Rep 1 plotN Rich – Rep 1 plot
Data CollectionData Collection GS data – 4 times during the growing season
• At sidedress (June 25 – 2008, 32 DAP)• GS/ 2 weeks after sidedress (2008- Jul. 9 & 26, Aug. 6)
From three locations within each plot, samples for:• Plant tissue for N analysis• Plant Height• SPAD 502 Meter readings (10 plants at each location)
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 4
Data CollectionData Collection Harvest
• Two middle rows• Yield monitor• Subsample for lint turnout
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 5
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
T1 T2 T3 T4
Time
ND
VI
N RichNo SideStandardHigh Side
NDVI increase through time increase in the cotton biomass.
Results - 2008Results - 2008
TTsPre-
plantSidedress
N (lbs/ac)
N RichN Rich 150 0
No sidedressNo sidedress 50 0
StandardStandard 70 50
High sidedressHigh sidedress 50 100
25-Jun 09-Jul 25-Jul 06-Aug
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 6
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
ND
VI
38
40
42
44
46
48
50
52
SP
AD
SPADN RichNo SidedressStandardHigh Sidedress
25-Jun 09-Jul 25-Jul 06-Aug
TTsPre-
plantSidedress
N (lbs/ac)
N RichN Rich 150 0
No No sidedresssidedress
50 0
StandardStandard 70 50
High High sidedresssidedress 50 100
Results - 2008Results - 2008
At sidedressAt sidedress:
• No NDVI differencesNo NDVI differences btwn N Rich (150 lb N at planting) & No sidedress (50 lb N at planting)• Standard TT (70 lb N ) had < NDVI than No sidedress (50 lb N)• NDVI trend ~ SPAD trend• No sidedress and High sidedress TTs – Same N rate at planting, but different NDVIbut different NDVI• Later in the season, no much SPAD & NDVI relation….maybe Plant height…biomassmaybe Plant height…biomass?
At sidedressAt sidedress
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 7
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
ND
VI
1000
2000
3000
4000
5000
6000
7000
8000
9000
NO
3-N
(pp
m)
TTsPre-
plantSidedress
N (lbs/ac)
N RichN Rich 150 0
No No sidedresssidedress
50 0
StandardStandard 70 50
High High sidedresssidedress 50 100
25-Jun 09-Jul 25-Jul 06-Aug
Results - 2008Results - 2008
At sidedressAt sidedress
NDVI and Petiole nitrate (ppm)
• At sidedress: At sidedress: • Low petiole Nitrate low NDVI (High siddress TT)
• After sidedress, no much relation btwn NDVI and petiole Nitratesidedress, no much relation btwn NDVI and petiole Nitrate
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 8
Results - 2008Results - 2008 NDVI vs. Lint YieldNDVI vs. Lint Yield
• Differences in yield respect to N rate and time Split application best !
• N at planting: both rates same NDVI• Split application, slightly higher NDVI-6wks
0.53
0.58
0.63
0.68
0.73
0.78
0.83
0.88
150 50 70 50
Nitrogen at Planting
Nitrogen at Sidedress
ND
VI
900
1000
1100
1200
1300
1400
Yie
ld (
lbs
/ac
re)
NDVI at sidedress NDVI (2wks from sidedress)
NDVI (6 wks from sidedress) Lint Yield
0 0 50 100
T1 T2 T3 T4
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 9
Results - 2008Results - 2008 NDVI vs. Lint YieldNDVI vs. Lint Yield
• 130 lb/ac yield difference btw T1 & T3 Same NDVI 2wks after sidedress• T2 - Lowest yield Highest NDVI at 2wks from sidedress, but lowest NDVI 6 wks
from sidedress• T3 – Highest yield Similar NDVI than T1 throughout the season
0.53
0.58
0.63
0.68
0.73
0.78
0.83
0.88
150 50 70 50
Nitrogen at Planting
Nitrogen at Sidedress
ND
VI
900
1000
1100
1200
1300
1400
Yie
ld (
lbs
/ac
re)
NDVI at sidedress NDVI (2wks from sidedress)
NDVI (6 wks from sidedress) Lint Yield
0 0 50 100
T1 T2 T3 T4
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 10
Results - 2009Results - 2009
NDVI increase through time increase in the cotton biomass. No much NDVI differences beyond 2wks after sidedress
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 12
NDVI at sidedress vs. Lint YieldNDVI at sidedress vs. Lint YieldResults - 2009Results - 2009
• A difference of 47 lb/ac btwn T1 and T2, however equal NDVI at sidedress
0.41
0.42
0.43
0.44
0.45
150 50 70 50Nitrogen at Planting
Nitrogen at Sidedress
ND
VI
780790800810820830840850860870880
Yie
ld (
lbs
/ac
re)
NDVI
Lint Yield
0 0 50 100
T1 T2 T3 T4T1 T2 T3 T4
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 13
ConclusionsConclusions
Yield responses to nitrogen application, especially split
application of N
NDVI increase up to 2 wks (sidedress), later no differences.At sidedress no NDVI differences btwn treatments.SPAD increases with split N application but no differences in
NDVI
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 14
Development of a Cotton Fertilizer Prescription for Variable Rate Application
in the Coastal Plain.
Kip BalkcomResearch AgronomistUSDA-ARS
Joey ShawSoil ScientistAgronomy and Soils
John FultonAgricultural EngineerBiosystems Engineering
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 15
Development of a Cotton Fertilizer Prescription for Variable Rate Application
in the Coastal Plain.• Quantify cotton response to different N rates across management zones for site-specific agriculture applications. • Relate N status of cotton to sensor based readings across the landscape to identify a relationship for variable N rate application.
• Identify cotton quality parameters across the landscape and relate to management systems.
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 16
Remote Sensing of Cotton in AL
Location: E.V. Smith Research Center , Alabama, USA.
*
Soils: Sandy Loam (Aquic and Typic Paleudults).
Size: 22 acresSize: 22 acres
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 17
Soil Survey Terrain Attributes
Electrical Conductivity
Soil surface Texture/SOC
20 x 9-m
Characterization of Soils/Landscapes
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 18
NTNTCTCT R1
Experimental DesignExperimental Design 6 Replications
8 Transects or strips/rep crossing landscape
Transects divided on Grids of 60 ft. x 24 ft.
Tillage split into 4 N rates. 0, 40, 80, 120 lb ac.
Wheat/Soybean
CottonCotton
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100 0 100 Meters
Border.shp
Mza_clusters.txt% 1% 2% 3% 4% 5
N
Cluster 1
Cluster 2
Cluster 3
Cluster 4
Cluster 5
EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON
ALABAMA REPORT 19
Data CollectionData Collection•GreenSeeker data :
• 11stst sampling – Early squaring sampling – Early squaring
• 22ndnd sampling – Mid-bloom sampling – Mid-bloom
• Collected plant measurements from “smart” cells.
• 25 uppermost mature leaves – N content + SPAD readings.
• Plant heights – 10 random plants.
• 1-m of row for whole plant biomass + N content.
• Calculate the seed cotton yields for each cell.
• Hand harvest - 50 bolls from each “smart” cell for seed N content.