本邦柑橘園土壌に関する研究(第一報) : 静岡県の柑橘園土壌に就て

概要

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Shizuoka prefecture is one of the chief districts of citrus production in Japan. Author studied the soil profiles of citrus orchard in this district and the results are summarized as follows. 1. Nomenclature from the result of mechanical analysis is mostly fine clay or fine clayey loam. 2. SiO_2-Al_2O_3 ratio of clay fraction is, with some exception, about 2.5. 3. Nitrogen and humus contents are scanty in surface soil (N 0.224〜0.118% and humus 4.862〜2.108%), and much less in deeper horizon. C-N ratio is 10〜9 in general, and 12〜14 exceptionally in Izu district. Content of available phosphorus is low even in surface soil (P_2O_5 0.0281〜0.0031% soluble in 1/5 N HCl), still less in deeper horizon. On the other hand, content of available potash is sufficient (K_2O 0.133〜0.026%). 4. pH value is mostly 5〜6. Exchangeable base is scanty contained (S=20.66〜10.29 m. e./100g surface soil), and Mg increases with depth. Saturation degree is also low.
社団法人日本土壌肥料学会の論文
1939-05-25