Yield and weight distribution of two potato cultivars grown from seed potatoes of different physiological ages

After seed potatoes (<i>Solanum tuberosum</i> L.) are harvested, they may be stored in sheds, in low temperature coolers or left un-lifted in the ground. This research describes the response of tuber yield and distribution (formed by the weight grade of each potato) of ‘Bondi’ and ‘Fraser’ crops planted from seed potatoes at different physiological ages generated from different combinations of these storage regimes applied in the Early and Late phases of storage. De-sprouting half of the potatoes prior to planting was used to accelerate the rate of physiological ageing, synchronise the planting material and increase the range of treatments. Total yield and number of potatoes produced were unaffected by any of the storage treatments and reflected a constant pattern of canopy development, radiation use efficiency and harvest index. The largest tubers were attained by higher rates of tuber growth which was inversely related to the number of stems per plant.