Early Growth and Development of Chinese Chive (Allium tuberosum Rottler) 'Green Road' Plants Sown at Different Times of the Year

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  • 播種時期を異にしたニラ（Ａｌｌｉｕｍ　ｔｕｂｅｒｏｓｕｍ　Ｒｏｔｔｌｅｒ）‘グリーンロード’の初期生育特性
  • ハシュ ジキ オ イ ニ シタ ニラ Allium tuberosum Rottler グリーンロード ノ ショキ セイイク トクセイ

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Abstract

The early growth and development of Chinese chive (Allium tuberosum Rottler) 'Green Road', were studied by sowing seeds every other month. The seedlings were grown for 40 days, and then transplanted to the sand-bed in a plastic house and cultivated with sufficient fertigation for 150 days until first cutting. Plant fresh weight at transplanting was significantly different depending on the month of sowing. The heaviest seedlings at transplanting time were those sown in April and June; the lightest ones were those sown in December and February. Growth patterns of leaf and bulb also differed depending on the growing season. At first harvest, plants with the largest leaf and bulb dry weights (DW) were those sown in June, whereas those with the least DW were those sown in October. Based on a tiller, the leaf DW was heaviest among other parts (i.e. bulb plus root) in October-sown plants during the latter period of cultivation. However, the DW of bulb plus root was larger than that of leaf in February- and April-sown plants. Growth rates both of leaf and bulb between transplanting and the first harvest correlated highly with the cumulative air temperature; the rates exhibited the same patterns until cumulative air temperature reached 2, 600 and 2, 200°C, respectively.

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