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The remobilization and transport of reserve carbon from a kiwifruit (Actinidia deliciosa) cane to developing axillary shoots was modelled using a simple pool structure and mass flow process. Manipulative experiments with mature kiwifruit plants are compared with simulation results. The model uses detailed architectural information rather than explicit partitioning functions, achieving carbon partitioning as emergent behaviour of a spatial organization. The model successfully simulated shoot growth and starch distribution patterns. # 1999 Annals of Botany Company

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Quantitative data on the root distribution of mature kiwifrit vines -Actinidia deliciosa cv. Hayward (A. Chev.) C. F. Liang et A. R. Ferguson -growing in a deep sandy loam soil of the Te Puke district were obtained by coring. Root distribution followed a pattern which appeared to be influenced by the soil horizons. Root density varied from 0.01 to 1.95 ern/em". In a total sampling depth of 4 m, 46% of the total root length was found between 2 and 4 m. It appears likely that substantial root densities exist at even greater depths. The mean length of root/unit ground surface area (129 cm/cm-) was higher than the values recorded for many other temperate fruit crops. Comparison of cores taken at 0.5 and 1.5 m from vine stems revealed relatively little decline in root density over this distance.