Abstract
The resistance of 10 potato varieties to mechanical injury was tested. Large intra- and intervarietal variations were detected. The Dutch varieties, Record and Bintje, proved to be the most resistant followed by the Finnish varieties Jaakko and Pito. The amount of severe injuries increased with the age and the size of tubers. Among these varieties no correlation appeared between varietal starch content and injury resistance of tubers.
Highlights
The resistance of 10 potato varieties to mechanical injury was tested
Several investigators have shown that varieties vary considerably in resistance to mechanical injury (Lampe 1959, Robertson 1966, Dambroth 1967, Gall et al 1967, Jacobsen 1969, Gechse 1970)
In 1968 a work dealing with the injury resistance of varieties commonly grown in Finland was started
Summary
In 1968 nine varieties and in 1969 ten varieties were grown in sandy soil in each of two replicates. Fertilization each year was 50 kg N, 53 kg P and 125 kg K per hectare; pH of the soil was 6.2. Because of the dry August the starch content was about 3 percentage units higher than usual. Varietal differences in size distribution were rather small. A weight of 1 kg with a cylindrical pin (0 8 mm) attached to it was fastened to the rim of a wheel. When the weight was released from different heights the rounded surface of the pin hit the tuber with a speed in accordance
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