Relation between growth conditions and dormancy of seed potatoes. 3. Effects of light |
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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 effects on the dormancy of progeny tubers of the timing and level of shading during plant growth were investigated in
three field experiments. The tubers were harvested while immature. Shading (50–75%) the crop shortly before haulm pulling
shortened dormancy by 5–7 days in two experiments. However, dormancy was hardly affected by 50% shading in one experiment,
carried out in a sunny dry period.
The effects of the photoperiod during tuber bulking on dormancy were studied in two indoor experiments. Plants were grown
at 18/12°C (day 12h/night) and a 12 h photoperiod. Shortly after tuber initiation, the photoperiod was extended to 18 h for
4–6 weeks by photosynthetically inactive incandescent light, or kept at 12 h. The effects of the photoperiod on dormancy were
up to 9 days, but differed between the cultivars and experiments.
Generally, the effects on tuber dormancy of differences in growth conditions, as reported in this series of papers, were limited. |
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Keywords: | cultivar daylength irradiance light intensity photoperiod shading Solanum tubersoum L tuber |
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