ABSTRACT

Plant Growth Regulator (PGR) in cotton traditionally has been applied in a blanket fashion. Vegetation indices generated from remotely sensed imagery can aid in creating site-specific prescriptions for the application of PGR. Plant height, length of the top 5 nodes, and 4^th internode length have been used to generated PGR rate recommendations. If there are correlations between these plant measurements and vegetation indices, then the vegetation indices may be used to drive rate recommendations. A randomized block experiment is performed to test the differences in crop canopy and yield associated with site-specific, variable-rate and blanket applications of PGR. An economic analysis is performed to compare the cost structures of the site-specific and variable-rate PGR applications with the traditional blanket PGR application techniques.