作物の養分吸収に関する動的研究 (第4報) : 作物根による亜硝酸生成の機作

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A series of water culture study elucidated the mechanism of nitrite formation in the rhyzosphere of metabolising plant roots as follows : 1. The nitrite formation is a reduction process from nitrate. No sign of oxidation from ammonium nitrogen was observed (Table 1) 2. The redoxpotential Eh_6 of the water culture solution lowered from 0.65〜0.68 volt to ca. 0.55 volt on the abundunt accumulation of nitrite nitrogen. As soon as hydrogen sulfide evolved it lowered even to ca. 0.14 volt. The fact indicates that nitrite formation is a reliable sign of mild reducing power of metabolising roots (Table 2). 3. Bubbling ordinary air air through the medium tremendously inhibited its formation (Table 3). 4. The nitrite formation was also remarkably inhibited by either darkening or cutting off stems and leaves with simultaneous reduction of organic reducable matter (Permanganate titration) in the medium (Table 4 (a), (b) and Table 5). 5. Although addition of glucose, asparagin and citric acid as energy materials to non-sterile culture medium lacking metabolising roots promoted nitrite formation to some extent, it was far less and slower as compared to its usual accumulation by metabolising roots (Table 6). All the experiments mentioned above may lead to the definite conclusion that the simultaneous and cooperative effect of the downward supply of some energy materials depending on the normally metabolising upper parts of the plant (Photosynthesis) and of the depression of oxygen partial pressure in the medium by metabolising (aerobic respiration) plant roots should contribute to the nitrite formation in the rhyzosphere.
一般社団法人日本土壌肥料学会の論文
1952-11-10

作物の養分吸収に関する動的研究 (第4報) : 作物根による亜硝酸生成の機作

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