根室釧路地方に分布する摩周統火山性土の特性とその地力維持に関する研究(第2報) : 根釧地方火山性土の開墾後に於ける地力推移に就いて

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The soil of Kushiro and Nemuro district has comparatively high productivity immediately after reclamation, but when 5〜6 years have elapsed after reclamation it suddenly looses the productivity. So, in order to make clear the reason and find out the fundamental course to maintain the productivity, writers collected many soils from reclaimed land according to the space of time after reclamation and determined their physical and chemical properties; we obtained the following conclusions : 1) Both exchange acidity and hydrolytic acidity are high in 1〜2 years after reclamation, then decrease gradually until 4 years after reclamation then keep the same level. In general, hydrolytic acidity is very high compared with exchange acidity. 2) Fixation of phosporic acid is very high. Silica-alumino ratio decreases gradually after the lapse of one year after reclamation. Accordingly the power of soil to fix phosphoric acid increases. This process differs fundamentally from the process reported previously by other investigators. 3) The content of nitrogen, especially easily decomposable nitrogen, decreases markedly 5〜6 years after reclamation. The same tendency was observed in respect to humus content. 4) The exchange capacity is high immediatly after reclamation, then gradually becomes less and keeps at an equilibrium state 5〜6 years after reclamation. 5) When fertile fields were dressed with farmyard manure every year after reclamation, the tendencies described above were not remarkable.
社団法人日本土壌肥料学会の論文
1954-12-15

根室釧路地方に分布する摩周統火山性土の特性とその地力維持に関する研究(第2報) : 根釧地方火山性土の開墾後に於ける地力推移に就いて

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