| Eolas Dualfhoinse |
Camera and phone subset (2020): images were taken over 0.5 x 0.5 m quadrats on 26 grass-clover plots at Moorepark Farm (Teagasc), using a tripod-mounted Canon EOS 90D and a handheld iPhone 6. For labelled quadrats, herbage was cut at 2-4 cm above ground with Gardena Accu 60 hand shears immediately after imaging. Fresh weight was recorded, and the herbage separated into grass, clover and weeds, oven-dried for 16 h and weighed for dry matter. Further unlabelled images were taken at random locations in the same plots. Drone subset (late autumn 2021): 7-36 images per paddock were taken over 23 paddocks with a DJI Mavic 2 Pro at 6-12 m. Paddock-level dry herbage mass came from (a) visual estimation by two experts at the time of imaging and (b) the protocol of Egan et al. (2018): two 1.2 x 8 m strips per paddock cut at 4 cm with an Etesia mower, and a 100 g subsample dried at 95 C for 16 h. |
Derilinx