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Non-destructive Measurements of Biomass in Millet, Cowpea, Groundnut, Weeds and Grass Swards using Reflectance, and their Application for Growth Analysis

Published online by Cambridge University Press:  03 October 2008

A. Buerkert ,
P. R. Lawrence ,
J. H. Williams  and
H. Marschner
A. Buerkert
Affiliation:
International Centre for Research in the Semi-Arid Tropics (ICRISAT) Sahelian Centre, BP 12404, Niamey, Niger
P. R. Lawrence
Affiliation:
International Centre for Research in the Semi-Arid Tropics (ICRISAT) Sahelian Centre, BP 12404, Niamey, Niger
J. H. Williams
Affiliation:
International Centre for Research in the Semi-Arid Tropics (ICRISAT) Sahelian Centre, BP 12404, Niamey, Niger
H. Marschner
Affiliation:
International Centre for Research in the Semi-Arid Tropics (ICRISAT) Sahelian Centre, BP 12404, Niamey, Niger
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Summary

A simple hand-held reflectometer was used to estimate the shoot dry matter of pearl millet (Pennisetum glaucum), groundnut (Arachis hypogaea), cowpea (Vigna unguiculata), weeds and grass swards non-destructively. While the instrument was able to predict shoot dry matter well for single, standing millet and cowpea plants and proved useful for a growth analysis of millet, its reliability was unsatisfactory for groundnut. For millet, the slope of two separate regressions between the difference of reflectance ratios and shoot dry matter, taken 10 days apart, was almost identical. This suggests a possible simplification in future crop growth models. The usefulness of the instrument for estimating dry matter in natural species mixtures such as weeds and grasses depended on the homogeneity of the mixture and the uniformity of their physiological state.

Medición de la biomasa utilizando la reflexión

Type
Research Article
Information
Experimental Agriculture , Volume 31 , Issue 1 , January 1995 , pp. 1 - 11
Copyright
Copyright © Cambridge University Press 1995

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