Incidence of hollow heart in potatoes as influenced by removal of foliage and shading
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The removal of foliage at successive stages of tuber development in 1940 and 1941 caused a decrease in the number of hills free from hollow heart when applied at the time of tuber setting but not at later periods.
Shading the plants with black sateen cloth for intervals of 5 and 10 days tended to increase the number of hills free from hollow heart when applied at time of tuber setting but had no effect when applied 21 days later.
Approximately the same incidence of hollow heart was observed in hills harvested when their average weight was 157 grams and the average tuber weight was 7.5 grams, as when the plants matured and. the average weight per hill was 776 grams and the average tuber weight 53 grams.
The removal of 20, 40, 60, and 80 per cent of the foliage did not significantly influence the average number of tubers set per hill, the mean yield per hill, nor the mean weight of the individual tubers. The removal of foliage was followed by a very active renewal of vine growth and a delayed maturity of the vine. This active renewal of vine growth may have been a significant contributing factor in increasing the incidence of hollow heart in the early period of tuber enlargement.
KeywordsHollow Heart Tuber Development Individual Tuber Active Renewal Tuber Setting
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