Abstract
Radiation interception, dry-matter accumulation and tuber yield were measured in crops of potato ( Solanum tuberosum L.) grown either with irrigation or droughted from plant emergence. Drought decreased total yield through reductions in both dry-matter accumulation and tuber water content. The reduction in dry-matter accumulation in droughted crops was attributed primarily to lower interception of radiation as a result of reduced leaf expansion and the suppression of branching. The efficiency of the conversion of intercepted radiation into dry-matter (light conversion coefficient, Q c) was constant in irrigated crops. In droughted crops, Q c was unaffected by soil moisture deficits ( θ d) less than 47 mm, but was negatively related to θ d greater than that. Drought increased the partitioning of assimilate into tubers in mid-season, but by the end of the season harvest index did not differ significantly between droughted and irrigated crops.
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