Abstract
Immature tubers of all the varieties gave very little or no breakdown when canned. Breakdown on canning increased with a delay in harvest. However, at maturityMaris Peer, Sutton’s Foremost, Arran Pilot andSieglinde gave much less breakdown thanKing Edward, Red Craig’s Royal, Ulster Viscount orUlster Concord. In 1970, but not in 1969, tubers from crops grown at high plant densities (269 eyes/m2) broke down more than those from low densities (59 eyes/m2). There was no significant relationship between tuber breakdown and tuber dry matter content. Tuber cell surface area decreased with a delay in harvest in all varieties. In general, increases in tuber breakdown with delay in harvest were associated with decreases in cell surface area. A simple cooking test which could be adopted for field use and estimates accurately the amount of breakdown that would be produced on canning is described.
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