Recording wetness on ryegrass (Lolium) leaves

摘要

Transistorised electronic equipment is described which can be used for the continuous recording of changes in leaf wetness on living ryegrass (Lolium) leaves (using microclip electrodes) in pasture herbage in a semi-quantitative manner. It was designed for use in studies on spore dispersal and spore leaf loads of the facial eczema fungusPithomyces chartarum(Berk. amp; Curt.) M. B. Ellis. The bridge, vibrator, and amplifier circuitry may also be used with non-living sensing elements in pastures.