SENSING METHOD AND APPARATUS FOR DETECTING PLANT NODES

摘要

A method of detecting the presence of a node (12) within a stem (10) of a plant, the method comprising making two measurements of a component of the electrical impedance of the stem (10), wherein a first measurement is made at a first location along the stem (10) and a second measurement is made at a second location along the stem (10), comparing the first measured component of the electrical impedance and the second measured component of the electrical impedance to produce a resultant output, and analysing the resultant output in order to determine the presence of a node or otherwise at the first location or the second location.