Combining ultrasonic sward height and spectral signatures to assess the biomass of legumegrass swards
Combining ultrasonic and spectral data improved predictions of grassland biomass. Enhancements were particularly obvious at high biomass levels. Ultrasonic sward height explained the majority of variance in predicted biomasses. Two-band vegetation indices performed best along slopes of water absorption bands. Increasing band width did not result in a substantial loss of prediction quality.
grassland yield ultrasonic sensor vegetation index precision farming