Abstract
A field trial with the potato varietyWhite Rose was carried out in order to investigate the influence of soil drought conditions at planting time on the subsequent growth behaviour and on the tuber yield, Drought at planting time delays tuber set, shortens the tuber formation period, increases tuber number, promotes their active bulking and produces a significant increase in yield. When soil drought conditions are permitted to develop at the beginning of the tuberization stage, the tuber formation period is lengthened to the detriment of their number, growth and yield. These detrimental effects almost disappear if planting is carried out under high soil moisture stress. Thus, drought hardening at the critical stage of water requirement would arise as an after-effect of drought at planting time.
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