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Development of On-the-go Nitrogen Application Algorithms for Cotton. Terry Griffin, Ph.D., CCA Assistant Professor – Economics Dept. of Agricultural Economics & Agribusiness. NEU Conference. Motivation and Issue. Analyses have been conducted for single datasets

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development of on the go nitrogen application algorithms for cotton

Development of On-the-go Nitrogen Application Algorithms for Cotton

Terry Griffin, Ph.D., CCA

Assistant Professor – Economics

Dept. of Agricultural Economics & Agribusiness

NEU Conference

motivation and issue
Motivation and Issue
  • Analyses have been conducted for single datasets
  • Failed to model multiple climates, systems, etc.
  • Global response estimated from pooled dataset
  • Derive on-the-go nitrogen application algorithms

Objective: analyze multi-state experiment data to estimate response between active sensor reflectance and cotton yield for on-the-go nitrogen management

    • Develop on-the-go N application algorithm
data and methods
Data and Methods
  • Pooled model
    • Multiple site-years; 13 states
    • All data (sites and years) in single dataset
    • Each sub-dataset controlled for heterogeneity
    • Testing for heterogeneity between sub-datasets
  • Correlation among
    • yield, nitrogen rate, NDVI values and timing
  • Regression analysis of pooled dataset
challenges
Challenges
  • Cotton in a perennial
  • N rate sufficient to cause yield penalty
  • Identifying appropriate timing for NDVI
    • DAP, GDD60
  • Testing functional forms of relationships
  • Testing indexes for algorithm
    • Variety, location, and GDD60 specific
    • Global algorithm with local intercept/slope shifters
cotton yield response to applied n
Cotton Yield Response to Applied N
  • Theoretically quadratic; without plateau
summary and future work
Summary and Future Work
  • Analysis is on-going
    • Have not determined optimum algorithm
  • Use of GDD60 needs to be revisited
acknowledgements
Acknowledgements
  • Funding from Cotton Inc.
  • Collaborators in respective states
  • John Kelley – Graduate Student
slide12
Terry Griffin

Assistant Professor - Economics

501.671.2182

tgriffin@uaex.edu