培養液中のN形態に対するラビットアイならびにハイブッシュ•ブルーベリーの生育反応の比較

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タイトル別名
  • Growth Responses to N Forms in Rabbiteye and Highbush Blueberries.
  • 培養液中のN形態に対するラビットアイならびにハイブッシュ・ブルーベリーの生育反応の比較〔英文〕
  • バイヨウエキチュウ ノ N ケイタイ ニ タイスル ラビットアイ ナラビニ ハ

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Effects of different NH4+/NO3- ratios in the nutrient solutions on the plant growth and the concentrations of free NH4+ in the leaves were compared between rabbiteye and highbush blueberries. One-year-old rooted cuttings of both blueberry species were grown in sand culture and supplied with 56mg•liter-1 of N at NH4+/NO3- ratios of 0/56, 42/14, 28/28, 14/42 and 0/56. The pH of the nutrient solutions was maintained at 5.5 in each treatment.Dry weight of plant tops was greatest at 28/28 of NH4+/NO3- ratio for both species. At 42/14 or the 0/56, plants of both blueberry species showed leaf scorch. The reduction in growth caused by excessive NH4+ supply at concentrations higher than 42mg•liter-1 was more noticeable in highbush blueberries than it was in rabbiteye blueberries. Highbush blueberries grew equally well at 28/28 and 14/42 of NH4+/NO3- ratio, whereas rabbiteye blueberries grew poorly at 14/42.For both blueberry species, the concentration of free NH4+ in the leaves increased as NH4+/NO3- ratio of nutrient solution increased. When NH4+/NO3- ratio was 56/0, highbush blueberries had lower concentrations of free NH4+ in leaves than rabbiteye blueberries did.Hence, highbush blueberries are seemingly less tolerant to the excessive supply of NH4+ than do rabbiteye blueberries, although NH4+ was assimilated more efficiently in highbush blueberries.

収録刊行物

  • 園芸学会雑誌

    園芸学会雑誌 60 (1), 41-45, 1991

    一般社団法人　園芸学会

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