土壌有機燐の作物による利用に関する研究(第5報) : オキシ酸塩添加による土壌有機燐の溶出及び無機化の促進について

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Effect of organic acid exuded from crop roots, upon mineralization of organic phosphorus in soils were investigated this time, and the results were as follows : 1. Crop roots, especially their caps, were observed to liberate continuously their surface cells into culture solution (Photo. 1 and 2). Rate of this liberation was so different with respect to plants as in the following order, Gramineae≫Leguminosae>Solanaceae. 2. By paper chromatography, cell sap of roots was recognized to contain organic acids, such as oxalic acid, succinic acid, malic acid, tartaric acid and citric acid. By the same chromatography, oxalic acid was traceable and tartaric acid as well as citric acid were found in a small amount in ether extract from nutrient solution, in which a large number of sweet potato shoot had been cultured. 3. Na salts of α-oxyacid (tartaric and citric acids), when added to soil, increased the solubility of organic phosphorus, originally contained in, and newly added to, the soil. This increase was mainly due to the solvent action of oxyacids but not due to the change of pH of the soil (Table 2 and Fig. 1). 4. Addition of oxyacids to soil promoted the mineralization of organic phosphorus, when the soil was incubated. This promotion was considered to be caused by the increased solubility of organic phosphorus due to addition of oxyacid and by the increased pH of soil and, at the same time by the accelerated activity of soil microbes by the supply of new carbon source (Table 3 and Fig. 2).
社団法人日本土壌肥料学会の論文
1956-03-05

土壌有機燐の作物による利用に関する研究(第5報) : オキシ酸塩添加による土壌有機燐の溶出及び無機化の促進について

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