Initial Growth of Planted Bare-root and Containerized Seedlings of Japanese Cypress (<i>Chamaecyparis obtusa</i>) after Nursery Rearing with Slow-release Fertilizer

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  • Watanabe Hitoshi
    Gifu Prefectural Research Institute for Forests
  • Moteki Yasukazu
    Gifu Prefectural Research Institute for Forests
  • Mimura Haruhiko
    Forestry Technology Development and Support Center, Chubu Regional Forest Office, Forestry Agency
  • Chimura Tomohiro
    Forestry Technology Development and Support Center, Chubu Regional Forest Office, Forestry Agency Tateyama Forest Office, Toyama District Forest Office, Chubu Regional Forest Office, Forestry Agency

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Other Title
  • ヒノキにおける実生裸苗と緩効性肥料を用いて育成した実生コンテナ苗の初期成長
  • ヒノキ ニ オケル ミショウ ラ ナエ ト カンコウセイ ヒリョウ オ モチイテ イクセイ シタ ミショウ コンテナ ナエ ノ ショキ セイチョウ

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Abstract

<p>We measured the growth and mass increment of 2-year-old containerized Japanese cypress (Chamaecyparis obtusa) seedlings for 2 years after planting and compared them with those of bare-root seedlings. We also clarified the influence of nursery application of slow-release fertilizer, which is eluted over long periods, on the initial growth of planted-out C. obtusa seedlings. We grew containerized seedlings for 1 year in multi-cavity containers with slow-release fertilizer with a 700-day elution period. At planting, the containerized seedlings were smaller in root collar diameter (hereafter, diameter) and taller, with a greater height-to-diameter ratio, than bare-root seedlings. Height and diameter 2 years after planting were bigger, and growth of both parameters during the first 2 years was higher, in the containerized seedlings. The height-to-diameter ratio of the containerized seedlings dropped rapidly in the first year. Increases in the leaf, stem, branch, and root mass were steeper in the containerized seedlings, but there was no difference in the top-root ratio between the two types of seedlings. The relative height and diameter growth rate of the containerized seedlings was superior in the first year, but this superiority became less clear in the second year. Slow-release fertilizer use in nurseries therefore improves the initial growth of C. obtusa seedlings, although its influence decreases with time.</p>

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