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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 1 Evaluation of Green Seeker for Nitrogen Fertilization in Cotton – Preliminary results in Alabama Shannon Norwood, Amy Winstead, Charles Burmester, Paul Mask, Dale Monks, John Fulton, Joey Shaw, Brenda Ortiz
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 2 Cotton Experimental Design 2007-2008-2009 North Alabama (Heavy soils) 4 Treatments TTs Pre-plantSidedress N (lbs/ac) N Rich1500 No sidedress500 Standard7050 High sidedress50100
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 3 Experimental Design Field strips Field strips (8 rows x length of the field) N Rich – Rep 1 plot Ramped calibration strip in the N Rich – Rep 1 plot Data 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)
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 4 Data Collection Harvest Two middle rows Yield monitor Subsample for lint turnout
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 5 NDVI increase through time increase in the cotton biomass. Results - 2008 TTs Pre- plant Sidedress N (lbs/ac) N Rich 1500 No sidedress 500 Standard 7050 High sidedress 50100 25-Jun09-Jul25-Jul06-Aug
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 6 SPAD N Rich No Sidedress Standard High Sidedress 25-Jun09-Jul25-Jul06-Aug TTs Pre- plant Sidedress N (lbs/ac) N Rich 1500 No sidedress 500 Standard7050 High sidedress 50100 Results - 2008 At sidedress At sidedress: No NDVI differences No 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 but different NDVI No sidedress and High sidedress TTs – Same N rate at planting, but different NDVI maybe Plant height…biomass Later in the season, no much SPAD & NDVI relation….maybe Plant height…biomass? At sidedress
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 7 TTs Pre- plant Sidedress N (lbs/ac) N Rich 1500 No sidedress 500 Standard7050 High sidedress 50100 25-Jun09-Jul25-Jul06-Aug Results - 2008 At sidedress NDVI and Petiole nitrate (ppm) At sidedress: At sidedress: Low petiole Nitrate low NDVI (High siddress TT) sidedress, no much relation btwn NDVI and petiole Nitrate After sidedress, no much relation btwn NDVI and petiole Nitrate
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 8 Results - 2008 NDVI 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 T1 T2 T3 T4
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 9 Results - 2008 NDVI 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 T1 T2 T3 T4
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 10 Results - 2009 NDVI increase through time increase in the cotton biomass. No much NDVI differences beyond 2wks after sidedress
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 11 SPAD readings Petiole nitrate (ppm) Results - 2009 There were no significant differences between the treatments for petiole nitrate or chlorophyll readings
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 12 NDVI at sidedress vs. Lint Yield Results - 2009 A difference of 47 lb/ac btwn T1 and T2, however equal NDVI at sidedress T1 T2 T3 T4
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 13 Conclusions 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
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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 Balkcom Research Agronomist USDA-ARS Joey Shaw Soil Scientist Agronomy and Soils John Fulton Agricultural Engineer Biosystems Engineering
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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.
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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 acres
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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
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 18 Experimental 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 Cotton Cluster 1 Cluster 2 Cluster 3 Cluster 4 Cluster 5
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EVALUATION OF GREENSEEKER FOR NITROGEN FETILIZATION IN COTTON ALABAMA REPORT 19 Data Collection GreenSeeker data : 1 st sampling – Early squaring1 st sampling – Early squaring 2 nd sampling – Mid-bloom 2 nd 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.
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