“…Carbon assimilation and partitioning is a complex process involving the photosynthetic capacity of the foliage canopy (Dwelle ef a)., 1981: Moll, 1983, source-sink interactions (Norsberger & Humphries, 1965;Moorby, 1968;Sale, 1974) and hormonal regulation (Wyse, Daie & Saftner, 1980). While canopy structure and duration of the leaf area have been demonstrated to be important components of carbon assimilation (Bremner & Taha, 1966;MacKerron & Waister, 1983;Hawkins, 1982), the results of this study suggest that visual estimation of gross size and shape of potato canopies is not necessarily related to tuber yield.…”