Abstract
Growth regulators offer possibilities of compensating for genotypic deficiencies that, in top fruit, would take many years to alter by genetical methods and, in marginal climates, they can help to overcome environmental shortcomings such as spring frosts or lack of winter chilling. In addition to their use in the control of growth and fruiting, they have made possible the development of advanced experimental systems in which pruning and harvesting may be fully mechanized.
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