SUMMARY Pattern of light interception, in both time and space, were measured during 1973 and 1974 in apple orchards. Several planting systems were investigated and the patterns of light interception were related to structural area (leaf area (LAI), branch area (BAI) and fruit area index (FAI)). Leaf area increased rapidly in May and June and then usually declined slowly until leaf-fall in October/November. The largest recorded light interception was just over 60% by a bed system of Cox's Orange Pippin during the beginning of September 1973. All orchards showed a seasonal hysteresis when light interception was plotted against total structural area (LAI, BAI and FAI). This hysteresis is due to changes in canopy size and solar altitude. The bed systems of planting showed the largest seasonal changes in both canopy size and hysteresis. The results are discussed in relation to planting designs in orchards.
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Palmer et al. (1977) studied this question.