On the ecology of lettuce in relation to the growing season

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  • 玉ちしやの播種期と生態 (第1報)
  • 玉ちしやの播種期と生態-1-
  • タマチシ ヤ ノ ハシュキ ト セイタイ 1

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Abstract

1. Some experiments were carried out to know the influence of sowing dates on the ecology of lettuce varieties, New York, Great Lake, Wayahead, and Simpson.<br>2. As the fall crop in Shiga Prefecture, such cabbage-heading varieties as New York and Great Lake could not form compact heads when sown after the end of August, while Wayahead and Simpson formed good heads even when sown as late as in the middle of September.<br>3. Those that had been sown late in September to early in October could be hardiest in winter and had flower in spring, but those having been sown earlier and grown larger were injured sever4ly by the winter cold.<br>4. Sugar content at the beginning of December was generally higher in inner leaves than in outer leaves and it was also higher in those that had been sown later and were in younger stage.<br>5. Osmotic pressure was, just like the sugar content, higher in inner leaves and in those having been sown later.

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