A REVIEW OF SPECTRAL PROPERTIES OF PLANTS AND THEIR POTENTIAL USE FORCROP WEED DISCRIMINATION IN ROW-CROPS/

The use of spectral information for the discrimination of crops and we eds is reviewed, discussing research results covering most of this cen tury. This includes discussions about the modelling of reflection from vegetation using optical and chemical information, indicating various problem areas (e.g. cell size, directional reflection, chemical compo sition). Models covered are those based on both the Kubelka-Munk theor y and descriptive methods. This leads to a selection of spectral range s, indices and ratios which might give useful information for vegetati on discrimination ranging from individual plants to whole fields of cr ops. A range of experiments covering different spectral regions are re viewed and the usefulness of the resulting spectral information is dis cussed. (C) 1998 Elsevier Science Ltd. All rights reserved.