a1 International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru PO, AP 502 324, India†
It is proposed that two distinct objectives should be recognized in the evaluation of intercropping advantages: (i) a biological objective to determine the increased biological efficiency of intercropping and (ii) a practical objective to determine the advantages that are likely to be obtained by a farmer. The sole crop systems with which intercropping must be compared to satisfy these objectives are defined. Evaluation in relative, absolute, monetary and nutritional units is discussed and some aspects of presenting intercropping data in graphical form are illustrated.
(Accepted September 05 1984)
p1 Present address: school of Development studies, University of East Anglia, Norwich NR4 7TJ, England.