Effects of N Forms on Plant Growth and Fractions of Leaf N in Rabbiteye Blueberries

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  • 施用窒素形態がブルーベリーの生育並びに葉中窒素成分濃度に及ぼす影響
  • セヨウ チッソ ケイタイ ガ ブルーベリー ノ セイイク ナラビニ ヨウチュウ

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Abstract

The effects of N forms on the growth and concentrations of N fractions in plant parts were studied in order to evaluate the assimilating capability of rabbiteye blueberry plants f or NH4 and NO3. One-year-old rooted cuttings were grown in sand culture at 3 levels of N and at 3 levels of pH with NH4, NH4NO3 or NO3 as N sources.<br>The dry weight of plant tops was reduced at 14ppm N supplied as any of 3 N forms. At 56ppm and 140ppm N, NH4NO3-fed plants grew better than NH4- and NO3-fed ones. At pH 4 and 5.5, there was no difference of growth between NH4-fed and NO3- fed plants, but at pH 7 NH4-fed plants were larger than NO3-fed ones.<br>NH4-fed plants had higher concentrations of total N and soluble N than NO3-fed ones. In NH4-fed plants, free NH4 concentrations in leaves increased much more than amide-N concentrations as N supply was increased. In NO3-fed plants NO3 accumulated scantly in leaves and roots even at 140ppm N. NO2 was not detected in any part of a plant.<br>These results showed that blueberry plants did not assimilate NH4 efficiently nor absorb NO3 sufficient for sustaining growth, which is distinctly different from such NH4-loving plants as rice and tea.

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