An ecophysiological approach to crop losses exemplified in the system wheat, leaf rust and glume blotch - I. A simple and accurate balance for the continuous measuring and recording of (evapo-)transpiration of plants in indoor experiments
article
A cheap and convenient blance for measuring and recording the transpiration rate of plants placed in pots, buckets, etc. is described. The essential mechanical part of the balance is a cross spring pivot. A change in weight on the balance arm causes an angular displacement of the arm with regard to the carrying structure. Torsion forces in the cross spring hinge compensate the change in weight, and a new stable equilibrium can be reached in any position of the balance arm within the limits of its movement (2° 40′). The position of the balance arm is transformed into millivolts DC by using a displacement transducer. The instrument can be loaded up to 25 kg (pots, soil, water, counterweights). The range of the balance is 500 grams, and the resolution of the output is better than 1 gram (1 ml). Other loads, ranges and resolutions can be realised by altering the characteristics of the cross spring pivot and the displacement transducer. © 1974 Koninklijke Nederlandse Planteziektenkundige Vereniging.
TNO Identifier
227625
ISSN
00282944
Source
Netherlands Journal of Plant Pathology, 80(3), pp. 77-84.
Pages
77-84
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