PASTURE YIELD INSTRUMENT USING A RADIO FREQUENCY BRIDGE
作者:
G. Nichols,
期刊:
Grass and Forage Science
(WILEY Available online 1973)
卷期:
Volume 28,
issue 1
页码: 27-30
ISSN:0142-5242
年代: 1973
DOI:10.1111/j.1365-2494.1973.tb00716.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
ABSTRACTA single unit grass‐meter has been developed to replace the twin transmitter‐receiver units which have been in use since 1958.In the new design a radio‐frequency capacitance bridge is mounted on top of a measuring head. Introduction of grass into the measuring head unbalances the bridge and the amount of unhalance, which is a function of the mass of the herbage, is indicated on a micro‐ammeter. Two ranges are incorporated so that sheep pastures with short grass and cow pastures with long grass can be m
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