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Auxanometer
Apparatus for measuring increase of growth in plants

An auxanometer (Gr. auxain= "to grow" + metron= "measure") is an apparatus for measuring increase of growth in plants.

In case of an arc-auxanometer (see picture), there is a thin cord fixed to the plant apex on one end and a dead-weight on the other with a pointer indicating against an arc scale. In some forms it passes over a pulley which has a pointer attached to it. When the plant's height increases, the pulley rotates and the pointer moves on a circular scale to directly give the magnitude of growth. The "rate of growth" is a derived measurement obtained by dividing the length of growth measured by the auxanometer, by the time said measurement took. It is also called an arc-indicator. These simple types of auxanometer have been replaced by rotation sensors at the fulcrum point linked to dataloggers with a balancing beam attached to the growing tip/plant apex.

Sensitive auxanometers allow measurement of growth as small as a micrometer, which allows measurement of growth in response to short-term changes in atmospheric composition. Auxanometers are used in laboratory, the field, and the classroom.

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See also

References

  1. Chisholm, Hugh, ed. (1911). "Auxanometer" . Encyclopædia Britannica. Vol. 3 (11th ed.). Cambridge University Press. p. 50. /wiki/Hugh_Chisholm

  2. Beach, Chandler B., ed. (1914). "Auxanometer" . The New Student's Reference Work . Chicago: F. E. Compton and Co. https://en.wikisource.org/wiki/The_New_Student%27s_Reference_Work/Auxanometer

  3. Bovie, W. T. (1912), "A Precision Auxanometer", Botanical Gazette, 53 (6): 504–509, doi:10.1086/330848 /wiki/Doi_(identifier)

  4. Ranson, S. L.; Harrison, A. (1955), "Experiments on Growth in Length of Plant Organs", Journal of Experimental Botany, 6: 75–79, doi:10.1093/jxb/6.1.75 /wiki/Doi_(identifier)

  5. Ranson, S. L.; Harrison, A. (1955), "Experiments on Growth in Length of Plant Organs", Journal of Experimental Botany, 6: 75–79, doi:10.1093/jxb/6.1.75 /wiki/Doi_(identifier)

  6. Gallagher, J. N.; Biscoe, P. V.; Saffell, R. A. (1976), "A Sensitive Auxanometer for Field Use", Journal of Experimental Botany, 27 (4): 704, doi:10.1093/jxb/27.4.704 /wiki/Doi_(identifier)

  7. W. T. Bovie; W. T. Bovie (1915), "A Simplified Precision Auxanometer", American Journal of Botany, 2 (2): 95–99, doi:10.2307/2435215, JSTOR 2435215 https://www.biodiversitylibrary.org/part/312606