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A MODIFIED CAPACITANCE PROBE TECHNIQUE FOR ESTIMATING PASTURE YIELD
Author(s) -
Johns G. G.,
Nicol G. R.,
Watkin B. R.
Publication year - 1965
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.1365-2494.1965.tb00427.x
Subject(s) - pasture , yield (engineering) , capacitance , crystal oscillator , environmental science , field (mathematics) , materials science , optoelectronics , mathematics , physics , agronomy , thermodynamics , quantum mechanics , biology , electrode , pure mathematics , resonator
An instrument for estimating pasture yield electronically was constructed. It was a modification of that described by Campbell et al (1). A transistorized crystal oscillator was incorporated to provide a highly stable frequency standard for use in the field. This provided a zero reference point for both the measuring head oscillator and the reading oscillator before and during use. The instrument is fully described and details are given of its field adjustment and operation.