チューリップの垂下球 (dropper) 形成に関する研究(第3報) : 栽培条件とdropperの発現との関係

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概要

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• 1. In order to elucidate the mechanism of forma-tion of droppers in tulip, the authors investigated the effects of various cultural conditions on the dropper formation, using the small bulbs of William Pitt and Kansas. 2. In general, tulips nursed under conditions fa-vorable for the growth of the top and roots formed great number of droppers in deeper soil. Whereas, unfavorable conditions, the formation of droppers was less vigorous. For instance, with regard to the planting depth of seed bulbs, many more droppers were formed in the shallower plot than in the deep-er one (Table 1 and 2); in the test of soil moisture condition, more were found in wet soil than in dry soil (Table 4); more were found in the soil with lower ground water level than in the soil with higher one (Table 7); in the test of CO2concentra-tion in the soil, more in the plot in which CO2 gas was supplied to the soil than in the untreated plot (Table 9); with regard to soil reaction, more in neutral soil than in alkali or acidic soil (Table 14 and 15). 3. In the experiment of the effects of nutrient conditions, where the tulips were supplied with various quantities of three elements, the growth of the plants was found to differ by the plots, but there were no recognizable differences in the formation of droppers. This result can be ascribed to the fact that the droppers had already been formed before the leaf emergence stage, when the tulip really began to absorb the fertilizer. 4. In the study of effects of photoperiodism, the growth of the tulip was shown to differ according to the treatment, but as in the case cited above, it was hard to recognize any difference in the formtion of droppers, and it is presumed that this is mainly due to the fact that the droppers had already been formed before the leaf emergence stage, when the photoperiodic treatment was begun. 5. Considering the fact that the dropper began to be formed soon after the seed bulbs had been planted, it was generally concluded that although the cultural conditions may considerably affect the formtion of droppers in tulips, the innate characters of the seed bulbs themselves seemed to be a more important cause of it.

• 園芸学会の論文

著者

• 萩屋 薫

  新潟大学農学部

• 雨木 若橘

  新潟大学農学部

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• チューリップの施肥に関する研究-2-

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