作物のマグネシウム栄養に関する研究(第2報) : マグネシウム欠乏大豆に於けるカルシウムの含量

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The same materials of the previous work (part 1), i.e. leaves and stems of the soybean plants which grew on the plots of the Mg-deficient soil fertilized with different, amounts of MgSO_4 and were harvested two week intervals, were used. These materials were divided into the fractions solved in such soluvents as distilled water, 2% acetic acid and 10% hydrochloric acid, and the insoluble one. The amounts of Ca in each fraction were determined. The results obtained may be summarized as follows; (1) Stems of the Mg-deficient soybean plants contain CH_3COOH soluble Ca more abandantly than those of the normal plants throughout the whole stages of growth. Leaves of the Mg-deficient soybean plants also contain CH_3COOH soluble Ca more than the normal plants. But at the podding stage, the amount of CH_3COOH soluble Ca in them decreased suddenly and became less than that of the normal plants. (2) These results may be explained as follows : (A) In the Mg-deficient soybean plants the pectine substance in middle lamella of cell wall may need Ca to substitute for Mg. As much Mg is generally required for the formation of pods, Ca in leaves is considered to be transported to the pods instead of Mg in the Mg-deficient soy-bean plants. (B) As Ca-ion and Mg-ion act similarly to coagulate pectine substance, they can substitute to each other in leaf and stem and the amounts of Ca and Mg combining with pectine substance seem to have a relation to mechanical hardness in the plant structure and to disease-resistance.
社団法人日本土壌肥料学会の論文
1953-12-20

作物のマグネシウム栄養に関する研究(第2報) : マグネシウム欠乏大豆に於けるカルシウムの含量

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