作物の養分吸収に関する動的研究(第12報) : 作物の燐酸(p^<32>)接触溶解吸収に及ぼす土壌の塩基飽和度及び燐酸固定力, 並びにこの仮説を立証するポツト栽培試験成績

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Wheat seedlings were grown with the technique similar to NEUBAUER but under artificially controlled light and temprature. To each beaker was added a quuantity of labelled fused magnesium phosphate, quartz sand and increasing quantities of natural soil differing in the exchange acidity and phosphate fixation. The results are show in Table 1,2 and Fig. 1. Similar experiments were conducted with artficially base unsaturated soils, the bases being washed out by 0.1 N HCl. The results are shown in Table 3,4 (a) (b) and Fig. 2. It can be concluded that the hydrogen ion of soil colloids which can enter into exchange reaction in KCl solution is of primary importance positive contributing to the "Contact solutional uptake" of phosphoric acid from fused magnesium phosphate, a kind of water hardly soluble but 2% citric acid soluble phosphatic fertilizers. Of second importance as negative factor was the power of phosphate fixation of the pertinent soils. As shown in Table 5 and 6,this mecanism was also proved to hold good over the whole growth period of millet in a pot experiment. The results might well suggest a new method of dressing for such kinds of phosphatic fertilizer i.e. if the soil is acid, to preliminarily mix the fertilizer with some dose of soil, as contrasted to the normal recommendation for superphosphate of lime as far as not mix it with soil.
一般社団法人日本土壌肥料学会の論文
1956-05-05