燐酸の肥効増進に及ぼす土壌改良剤の腐植類似効果に就いて(第1報) : Krilium 添加による土壌燐酸吸収力の変移

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Soil conditions have widely been studied as affecting physical properties of soil. The poly-organic acid properties of these material, however, might as well affect the chemical properties of soil, such as phosphoric acid fixation, ion exchange capacity etc. similar to humic acid. Five g of Tanashi volcanic ash soil preliminarily added with various amounts of Krilium 9 or 6 were shaken with 50 cc phosphate solution containing 25 mg P_2O_5 as K_2HPO_4 at various regulated pH. The fixation of phosphoric acid was determined by measuring the residual P_2O_5 in the solution. The application of Krilium 9 at comparatively low concentrations of 0.05〜0.2% was almost indifferent to or slightly promoted phosphate fixation possibly due to a slight lowering of pH (cf. Table 1 and Fig. 1). At comparatively higher concentrations of 0.3〜2.0% Krilium 6 and 9 evidently depressed the phosphate fixation compared at the same pH level as shown in Table 2,3 and Fig. 2,3. The addition of CaCO_3 prior to the application of Krilium almost did not alter the general trend (cf. Table 6 and Fig. 6). Sodium humate, which was prepared from pertinent soil, similarly and equally affected the phosphate fixation as Krilium as shown in Table 4,5 and Fig. 4,5. The mechanism was discussed on the basis of the acidoidal and complex froming properties of these materials. Further, it was suggested that the simultaneons band application of Krilium with fertilizers containing phosphate may be beneficial in promoting the phosphate availability.
一般社団法人日本土壌肥料学会の論文
1956-01-05

燐酸の肥効増進に及ぼす土壌改良剤の腐植類似効果に就いて(第1報) : Krilium 添加による土壌燐酸吸収力の変移

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