Active canopy sensing of winter wheat nitrogen status: An evaluation of two sensor systems
This paper systematically evaluated a three band active sensor, Crop Circle ACS-470. The GDVI index (R2=0.60) performed best for estimating plant N concentration. The CIG index (R2=0.89) performed best for estimating plant N uptake. The GRDVI and MGSAVI indices (R2=0.78 and 0.77) performed best for estimating NNI.
nitrogen status crop circle active crop sensor nitrogen nutrition index precision nitrogen management greenseeker