Comparisons between containerized seedlings and bare root seedlings of Cryptomeria japonica planted in a dry period based on the survival, growth, and frequency of snow damage.

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  • Zushi Kotaro
    Toyama Prefectural Agricultural, Forestry & Fisheries Research Center Forest Research Institute

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  • 乾燥期に植栽したスギコンテナ苗と裸苗の活着，生育および積雪被害発生状況の比較
  • カンソウキ ニ ショクサイシタ スギコンテナ ナエ ト ラ ナエ ノ カッチャク,セイイク オヨビ セキセツ ヒガイ ハッセイ ジョウキョウ ノ ヒカク

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Abstract

<p>Containerized seedlings and bare root seedlings of Cryptomeria japonica were compared with regard to survival, growth, and frequency of snow damage to verify the superiority of containerized seedlings over bare root seedlings. The seedlings were planted in May, i.e., the driest month of the year. The containerized seedlings were planted using three methods, namely shallow planting using a dibble, deep planting using a dibble, and planting using a how. Eighteen days after planting, mortality of bare root seedlings accounted for >80% of the total planting, whereas that of containerized seedlings accounted for <10% of the total planting. Thus, containerized seedlings outperformed bare root seedlings in terms of survival in dry condition. Regarding relative growth during the first growing season, the diameter growth of containerized seedlings was greater than that of bare root seedlings, and the height growth of both seedling types was equivalent, except containerized seedlings that were shallowly planted using a dibble. Regarding snow damage after the first snow season, uprooting was not observed for both seedling types. The leaning angles of containerized seedlings shallowly planted using a dibble were larger than those of bare root seedlings. In contrast, the leaning angles of containerized seedlings deeply planted using a dibble were equivalent to those of bare root seedlings.</p>

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