Cotton (Gossypium hirsutum L.) reflectance has potential to drive variable rate N (VRN) applications, but more precise definitions of relationships between sensor-observed reflectance, plant height, and N status are necessary. The objectives of this study were to define effectiveness and relationships between three commercially available sensors, and examine relationships of wavelengths and indices obtained by a spectrometer to plant height and N status. Field trials were conducted during 2008-2010 growing seasons at Mississippi State, MS. Fertilizer N rates ranged from 0-135 kg N ha-1 to establish growth differences. Sensor effects were significant, but sensors monitoring Normalized Difference Vegetation Index (NDVI) failed to correlate well with early-season N status. Wavelengths and indices utilizing the red-edge correlated most strongly with N status. Both Guyot's Red Edge Index (REI) and Canopy Chlorophyll Content Index (CCCI) correlated consistently with N status independent of biomass status early enough in the growing season to drive VRN.
|Advisor:||Varco, Jac J.|
|Commitee:||Cox, Michael S., Lawrence, Gary W., Reddy, K. Raja, Roberts, Darrin F.|
|School:||Mississippi State University|
|Department:||Plant and Soil Sciences|
|School Location:||United States -- Mississippi|
|Source:||MAI 50/01M, Masters Abstracts International|
|Subjects:||Agronomy, Remote sensing|
|Keywords:||Canopy chlorophyll content index, Cotton, Nitrogen, Normalized difference vegetation index, Red edge index, Sensor|
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