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Exploiting the pasture capacitance probe in agricultural research: a comparison with other methods of measuring herbage mass

  • S. F. Crosbie (a1), B. M. Smallfield (a1), H. Hawker (a1), M. J. S. Floate (a1), J. M. Keoghan (a1), P. D. Enright (a1) and R. J. Abernethy (a1)...

Summary

The precision of the capacitance probe in detecting herbage mass differences between treatments has been assessed on a cross section of field trials in Otago-Southland, New Zealand. Used thoughtfully, the probe appears at least as good as any other alternative. Corrected meter readings from the probe may be used directly for relative ranking of treatments although calibration is desirable for interpretation purposes, and becomes essential when swards of widely differing composition are to be related. Considerable overall time savings, especially in the laboratory, are possible in comparison with other methods.

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Bryant, A. M., Parker, O. F., Cook, M. A. S. & Taylor, M. J. (1971). An evaluation of the performance of the capacitance meter for estimating the yield of dairy pastures. Proceedings of the New Zealand Grassland Association 33, 8389.
Campbell, A. G., Phillips, D. S. M.; & O'Reilly, E. D. (1962). An electronic instrument for pasture yield estimation. Journal of the British Grassland Society 17, 89100.
Hawker, H., Crosbie, S. F., Barber, M. & Andrews, R. N. (1985). Effects of shearing and herbage allowance on the intake, liveweight gain and wool growth of Romney ewe hoggets in spring-summer. Proceedings of the New Zealand Society of Animal Production 45, 141145.
Johns, G. G. (1972). The accuracy of a range of capacitance probe methods for estimating pasture yields. Journal of Agricultural Science, Cambridge 79, 273280.
Jones, R. J. & Haydock, K. P. (1970). Yield estimation of tropical and temperate pasture species using an electronic capacitance meter. Journal of Agricultural Science, Cambridge 75, 2736.
Jones, R. M., Sandland, R. L. & Bunch, G. A. (1977). Limitations of the electronic capacitance meter in measuring yields of grazed tropical pastures. Journal of the British Grassland Society 32, 105113.
Michell, P. & Large, R. V. (1983). The estimation of herbage mass of perennial ryegrass swards: a comparative evaluation of a rising-plate meter and a single-probe capacitance meter calibrated at and above ground level. Grass and Forage Science 38, 295299.
Richardson, M. A. (1984). Notes for Pasture Probe Users. New Zealand Ministry of Agriculture and Fisheries (Agricultural Research) technical report. 09 1984.
Vickery, P. J. & Nicol, G. R. (1982) An improved electronic capacitance meter for estimating pasture yield: construction details and performance tests. Animal Research Laboratories Technical Paper No. 9, CSIRO, Australia.

Exploiting the pasture capacitance probe in agricultural research: a comparison with other methods of measuring herbage mass

  • S. F. Crosbie (a1), B. M. Smallfield (a1), H. Hawker (a1), M. J. S. Floate (a1), J. M. Keoghan (a1), P. D. Enright (a1) and R. J. Abernethy (a1)...

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