Optimum nitrogen content for controlling Fusarium basal rot and ensuring a satisfactory harvest of bleaching rakkyo from rakkyo parent bulbs
2003
Aoki, K. (Chiba-ken. Agricultural Experiment Station (Japan)) | Takeuchi, T.
Summary The influence of the fertilization during rakkyo parent bulb cultivation on the occurrence of post harvest Fusarium basal rot, and the ability of harvested parent bulbs to produce bleaching rakkyo was studied. The results obtained are outlined below. 1 . Bulb rot advanced rapidly in the first month after harvesting. 2 . One of the peculiarities of the disease was that even if a plant was infected, not all the bulbs harvested exhibited rot. There were many plants from which only 10 to 20 percent of the harvested bulbs rotted. 3 . In fungus contaminated fields, exess nitrogen fertilizing increased the disease. Fertilization that produced bulbs with a nitrogen content of less than 1.5 percent was effective in controlling the disease. 4 . Bulbs with a nitrogen content was 0.90 percent produced less bleachig rakyo than those with 1.27 or 1.60 percent. 5 . Nitrogen fertilization which produced bulbs with nitrogen content of 1.3 to 1.5 percent was found to be effective both in controlling Fusarium basal rot, and in ensuring a good harvest of bleachig rakkyo.
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