Daylength and main Stem Number Effects on Yield Components and Tuber Yield of Potatoes (Solanum tuberosum L. cv. Erntestolz)
1992
Berga Lemaga
The effects of daylength and number of main stems per plant on yield components, tuber yield, and crude protein content of tubers were examined. At 44 days after emergence, a smaller leaf area, more tubers (first year), higher average tuber weight, and tuber yield were obtained under the 12-hour daylength than under 16 or 20 hours. The amount of dry matter distributed to tubers was highest under the 12-hour daylength. After senescence, tuber number and yield were higher under longer daylengths. Final tuber number and tuber yield were highest under the natural daylength when averaged over all stem numbers. Leaf area, tuber number and tuber yield per plant increased significantly with increasing number of main stems. The opposite, however, was true when the results were expressed per stem. Increasing the number of main stems per plant favored the distribution of dry matter to tubers. Crude protein content of tubers, but not necessarily protein yield was highest under the shortest daylength. Variations in number of main stems had no effect on protein content of tubers.
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