Continuous Measurement of Shoot Extension and Stem Expansion in the Field

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Abstract
The environmental factors which affect plant growth are often strongly correlated with each other. Short period, high resolution measurements of changes in plant dimensions are necessary to separate the effects of these factors on growth in the field. The extension growth of apple shoots in orchards was measured in all weathers with a resolution of 0·1 mm and 88s with a new design of auxanometer incorporating a linear-variable differential transformer mounted on a light frame enclosing the shoots. The outputs of four of these instruments and of two dendrometers were fed in sequence to a potentiometric recorder by an electronically controlled switching system which, with slight modification, could have handled twice as many sensors.

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