This methodological paper recommends a modelling approach to achieve a greater understanding of the physiology of yield in yams ( Dioscorea spp.), and of the influence of various ecological, biotic and planter-induced factors on the yield. Such a model would also permit the prediction of yield under various conditions, and would be a tool in land evaluation. Preference is indicated for a simple model which would not require elaborate instrumentation for validation. A scheme for such a simple model is presented. Available literature data for parameterisation of the model are reviewed and areas of information gaps and additional research needs are highlighted. It is concluded that the most pressing need is for data sets derived from well-planned comprehensive field experiments. It is suggested that future yam field research should make use of the framework presented to facilitate comparison of results and to develop a more comprehensive model of yam growth and production.
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