Effects of Nutrient Solution pH on the Growth and Nutrient Uptake of Highbush and Rabbiteye Blueberries

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  • ハイブッシュおよびラビットアイ・ブルーベリーの生育と養分吸収に及ぼす培養液pHの影響
  • ハイブッシュ オヨビ ラビットアイ ブルーベリー ノ セイイク ト ヨウブン

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Abstract

Five-year-old 'Jersey' highbush (Vaccinium corymbosum) and 'Homebell' rabbiteye blueberry (V.ashei) trees were grown in solution culture with different pH (3.5,4.5 and 5.5) for 2 years. At pH 3. 5,both trees (species) all died by the 2nd growing season with wilting symptoms on fruits, shoots and leaves. Tree weights increased the highest at pH 4.5 for Jersey and at pH 5.5 for Homebell. Tree weights including harvested fruits increased the highest in late spring for Jersey and in mid- to late summer for Homebell. The top-root ratio increased in both trees with raising solution pH from 3.5 to 5.5. Yields and average weights of fruits in both trees decreased markedly at pH 3.5 as compared with other pH treatments. N uptake of both trees increased gradually from Apr. to Sept. and decreased from Sept. to Oct. P and K were also absorbed similar to N, but did not decreased in late autumn. Ca uptake in both trees increased to early Aug., decreased to early Sept. and then increased again to late Oct. Mg was absorbed higher during the mid- to late growing season. Low solution pH resulted in decreased NH_4-N and Ca uptake and increased NO_3-N uptake. pH 3.5 treatment resulted in decreased NH_4-N, P, K and Ca uptake in Jersey. Leaf N, P, Ca and Mg contents of Jersey were the highest at pH 3.5. Leaf Ca and Mg contents of Jersey increased with lowering the solution pH from 5.5 to 3.5. Water absorption of both trees increased with raising the solution pH from 3.5 to 5.5,and was closely related to the growth of tops.

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