Vieillissement physiologique des plants de pommes de terre: comportement des varietes

Reust, W..; , Nyon Hebeisen, Th.

Assessment of physiological vigour of potato cultivars | Vieillissement physiologique des plants de pommes de terre: comportement des varietes

2003

Reust, W.. | (Station federale de recherches en production vegetale de Changins (RAC), Nyon (Switzerland))Hebeisen, Th.

Dormancy, incubation periods and physiological vigour or rusticity of new potato cultivars were determined during the official cultivar assessment programme in Switzerland. Large variations between cultivars were observed, from 2000 to 3400 day-degrees for dormancy and from 1900 to 3700 days-degrees for incubation periodsday-degrees represent the sums of cumulated temperatures above zero centigrade. Field trials with physiologically aged seed identified the physiological vigour of the cultivars. Those with low vigour or tolerance to ageing showed poor emergence and yield after prolonged sprouting periods. There was no relationship between precocity and physiological vigour. Vigour is a very useful indication for the farmers because it points out those cultivars which are sensitive to warm storage or long sprouting periods and desprouting before planting.

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