RED EDGE AS A POTENTIAL INDEX FOR DETECTING DIFFERENCES IN PLANT NITROGEN STATUS IN WINTER WHEAT |
| |
| Authors: | Yumiko Kanke William Raun John Solie Marvin Stone Randal Taylor |
| |
| Affiliation: | 1. Department of Plant and Soil Sciences , Oklahoma State University , Stillwater , Oklahoma , USA;2. Department of Biosystems and Agricultural Engineering , Oklahoma State University , Stillwater , Oklahoma , USA |
| |
| Abstract: | Under certain conditions normalized difference vegetative index (NDVI) has low sensitivity; therefore red-edge position (REP) has been tested as an alternative vegetative index. The objective of this study was to determine if REP could be useful for detecting differences in N status for winter wheat compared to NDVI. A spectrometer, and the SPAD meter were used to measure N status. Sensitivity to plant N response and different growth stages was found for NDVI and REP, but NDVI sensitivity tended to decrease as N rate increased and REP sensitivity tended to increase with increased N rate and advancing growth stage. Both NDVI and REP were linearly correlated at all growth stages (r2 = 0.85). REP and SPAD meter readings were highly correlated (r2 = 0.62) as were NDVI and SPAD (r2 = 0.56). Overall, REP and NDVI sensitivity at high plant biomass were similar for winter wheat. |
| |
| Keywords: | NDVI red edge wheat |
|
|
