Effects of Flood Time and Period, Differences among Cultivars, and Liquid Manure Irrigation after Waterlogging on Growth and Yield of Lettuce

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  • Nakano Shinichi
    Hyogo Prefectural Agriculture, Forestry and Fishery Technology Center Awaji Agriculture Technology Center
  • Nishino Masaru
    Hyogo Prefectural Agriculture, Forestry and Fishery Technology Center Agriculture Technology Center
  • Kawai Takahumi
    Hyogo Prefectural Agriculture, Forestry and Fishery Technology Center Awaji Agriculture Technology Center
  • Murakami Kazuhide
    Hyogo Prefectural Agriculture, Forestry and Fishery Technology Center Awaji Agriculture Technology Center

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  • 冠水の時期と時間，品種の違いならびに湛水後の液肥かん注処理がレタスの生育，収量に及ぼす影響
  • カンスイ ノ ジキ ト ジカン,ヒンシュ ノ チガイ ナラビニ タンスイ ゴ ノ エキヒカンチュウ ショリ ガ レタス ノ セイイク,シュウリョウ ニ オヨボス エイキョウ

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<p>Open-field vegetables are often damaged by incidents like short periods of heavy rain or typhoons, especially in the period from summer to autumn. To reduce the damage to such vegetables caused by flooding, we examined the effects of the duration of flooding (flood time), the period in which flooding occurred (flood period), varietal differences in waterlogging tolerance, and liquid manure irrigation after waterlogging on the growth and yield of lettuces. The effects of the flood period and time on lettuce growth were greater before head formation (leaf age 13); i.e., the head weight was significantly reduced by 12 hours’ flooding, and all lettuces died when the flood time was 24 hours. In contrast, the head weight was not affected by 12 hours’ flooding in the early phase of head formation (leaf age 18), but when flooding occurred during the period just before the harvest (leaf age 35) the quality of the lettuces was reduced by the presence of clay. Regarding the crop type, the ‘Hamming Chau’ variety, which is sown in late August, exhibited a high waterlogging tolerance, and its head weight was not reduced by waterlogging. As for methods that can aid recovery after waterlogging, liquid fertilizer composed of urea diluted 50 times with water (total amount: 50 L・a–1) was given to lettuces that had been subjected to 6 hours’ waterlogging before head formation (leaf age 16) or during the early phase of head formation (leaf age 18). Compared with the lettuces that were not treated with urea after the waterlogging, the head weight and head volume of the urea-treated lettuces were 12 and 33% greater, respectively, being similar to the values of the non-waterlogged lettuces.</p>

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