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An ultrasonic rangefinder for measuring the undisturbed surface height of continuously grazed grass swards
Author(s) -
HUTCHINGS N. J.,
PHILLIPS A. H.,
DOBSON RUTH C.
Publication year - 1990
Publication title -
grass and forage science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.716
H-Index - 56
eISSN - 1365-2494
pISSN - 0142-5242
DOI - 10.1111/j.1365-2494.1990.tb02192.x
Subject(s) - ultrasonic sensor , pasture , environmental science , agronomy , biology , acoustics , physics
An ultrasonic rangefinder (sonic sward stick) was developed for rapidly measuring and recording the undisturbed surface height of swards. HFRO and ultrasonic sward stick measurements of undisturbed sward height over continuously grazed pasture were closely related. The measurements obtained with both instruments were related to the sward mass; the distribution of that mass between leaf, stem and dead material had little effect.