過燐酸石灰と蛇紋岩との反応に関する研究(第2報) : 苦土の有効化に及ぼす蛇紋岩粒度の影響について

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In the previous report, writers recognized that water and free phosphoric acid were important factors on the conversion to available magnesium, and the presence of about 15 per cent water and several per cent free phosphoric acid increased largely both amount and speed of this conversion. Now the effect of serpentine particle size on conversion to available magnesium was studied. On the experiment, the serpentine was classified to the samples as 30〜50,50〜70,70〜100,100〜150 and 150< meshes. These materials were analysed according to the procedure given in the 1st report. Sixteen mesh ordinary superphosphate (Table 1,a) was mixed with classified serpentine (Table 1,b) in the 6 : 1 proportion; and water was added to these five mixtures to 15 per cent, respectively. Total, 2 per cent citric acid soluble and water soluble MgO and P_2O_5 were determined after 1,7,14,21 and 56 days curings at 29℃, while being compared with the change of pH value (Table 2). The results obtained are summarized as follows : 1. Increase of pH value was proportional to the fineness of serpentine particle size. 2. Amount and speed of the conversion to available magnesium also were proportional to the fineness of serpentine particle size. 3. The conversion of magnesium was satisfied, when the fineness of particle size was 70 mesh pass.
社団法人日本土壌肥料学会の論文
1955-02-15