Relation between growth conditions and dormancy of seed potatoes. 1. Effects of nitrogen |
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| Authors: | M K Van Ittersum |
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| Institution: | (1) Department of Field Crops and Grassland Science, Wageningen Agricultural University, Haarweg 333, 6709 RZ Wageningen, The Netherlands;(2) Present address: Department of Theoretical Production Ecology, P.O. Box 430, 6700 AK Wageningen, The Netherlands |
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| Abstract: | Summary The duration of dormancy of seed potatoes varies between years and between origins. Therefore, the effects of conditions during
crop growth on dormancy of progeny tubers were studied. The effect of nitrogen during tuber bulking on the duration of dormancy
was investigated in three field experiments with two cultivars. In addition to an application of 125 kg N/ha at planting,
top dressings of 0–150 kg N/ha were given about 2 weeks after tuber initiation. Haulm was pulled about 4 weeks later. The
effect of nitrogen rate at planting was also examined in one experiment.
Nitrogen top dressings shortened dormancy in all experiments by 5–8 days. An increased nitrogen rate at planting resulted
in a shorter dormancy when the duration of dormancy was expressed in days after tuber initiation, but not when it was expressed
in days after haulm pulling, probably because extra nitrogen also delayed tuber initiation. |
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| Keywords: | cultivar nitrate nitrogen Solanum tuberosum L tuber |
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