Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Varco, J. Jac.
Committee Member
Oldham, J. Larry
Committee Member
Harkess, Richard L.
Committee Member
Lemus, Rocky W.
Committee Member
Henry, W. Brien
Date of Degree
5-9-2015
Document Type
Dissertation - Open Access
Major
Agronomy
Degree Name
Doctor of Philosophy
College
College of Agriculture and Life Sciences
Department
Department of Plant and Soil Sciences
Abstract
Cotton (Gossypium hirsutum L.) and corn (Zea mays L.) spectral reflectance holds promise for deriving variable rate N (VRN) treatments calibrated with red-edge inflection (REI) type vegetation indices (VIs). The objectives of this study were to define the relationships between two commercially available sensors and the suitable VIs used to predict N status. Field trials were conducted during the 2012-2013 growing seasons using fixed and variable N rates in cotton ranging from 33.6-134.4 kg N ha-1 and fixed N rates in corn ranging from 0.0 to 268.8 kg N ha-1. Leaf N concentration, SPAD chlorophyll and crop yield were analyzed for their relation to fertilizer N treatment. Sensor effects were significant and red-edge VIs most strongly correlated to N status. A theoretical ENDVI index was derived from the research dataset as an improvement and alternative to the Guyot’s Red Edge Inflection and Simplified Canopy Chlorophyll Content Index (SI).
URI
https://hdl.handle.net/11668/16613
Recommended Citation
Fox, Amelia Ann Amy, "An Integrated Approach for Predicting Nitrogen Status in Early Cotton and Corn" (2015). Theses and Dissertations. 564.
https://scholarsjunction.msstate.edu/td/564