水耕による濃度試験からみた桑のカリ栄養の指標

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タイトル別名
  • Diagnostic indices of potassium nutritional status of mulberry trees, based on water culture experiment with increasing potassium concentrations.
  • スイコウ ニ ヨル ノウド シケン カラ ミタ クワ ノ カリ エイヨウ ノ

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Effect of changes in the potassium concentration in the culture solution (7 levels ranging from 0 to 20mM) on the nutritional status of mulberry trees was studied.<br>At a concentration below 1/20mM typical potassium deficiency symptoms were revealed and yellowing of leaves at a lower position appeared at a concentration of 1/5mM. No external abnormalities were observed at higher concentrations. There was also a relationship between the appearance of the symptoms and the intensity of solar radiation.<br>With the increase of potassium concentration, the potassium contents increased in every part of the trees, especially in the petioles and roots, which are considered to contribute to the regulation of the distribution of potassium absorbed into each part. The contents of other nutrients were also affected, in particular calcium, magnesium and phospohrus contents decreased, although these changes did not exert a deleterious effect on the plant.<br>Potassium nutritional status in trees was estimated from the relation between leaf yield and potassium contents in leaf blades or petioles and indices for the diagnosis of the nutritional status were proposed, based on the comporison of potassium contents in the leaf blades and petioles of the leaves at the upper middle position; in the case of deficiency the content was lower in the petioles than in the blades and in the case of abundance or excess the content was higher in the former than in the latter organs.<br>Estimated contents corresponding to each status were as follows; concentration below 0.3-0.4% in the blades or 0.3% in the petioles were associated with a deficiency in pottassium in the tree; concentrations up to 0.6% in each orqan corresponded to a deficiency or optimal status; concentrations up to 2.5% in the blades or 5.7% in the petioles corresponded to an abundance in potassium while higher contents to an excess.

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