00228505

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フユドリ タマネギ ノ ヒダイ ト ニッチョウ トノ カンケイ エンゲイ ノウガク

A Relationship of Bulbing of Winter-Harvesting Onion to Day-Length

Japanese (日本語)

神戸大学農学部研究報告

12(1)

1-4

神戸大学農学部

1976

2006-09-15

本文ファイルは、国立情報学研究所CiNiiより提供されたものです。

The work was carried out to clarify the inductable period of bulb formation in onion plants, using the winter-harvesting strain of the cultivar Kaizuka-wase, in autumn, at Kobe University, Rokko-dai (Lat. 34°41′N). The dry sets of onion were planted on the 10th September, and photoperiodic treatment was carried out from the 20th September to the 19th Nobember through the combination of natural and short day-lengths. Of the onion plants exposed to natural day-length from the 20th September for 30 days, the majority did form the bulbs and a few came to maturity after 60 days of the start of treatment. And the bulbing of onion plants was apparently affected owing to whether sprouting was earlier or later, too. The plants exposed to natural day-length on and after the 10th October, however, did not form any bulb. From these results, it may be concluded that the critical day-length for bulbing in the winter-harvesting strain of the cultivar Kaizuka-wase is likely to be arounding 12 hours.

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