本邦柑橘園土壌に関する研究(第四報) 愛媛県の柑橘園土壌に就て

概要

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Ehime prefecture is a chief district of citrus production in Japan. Author studied the soil profiles of citrus garden in this prefecture. The results obtained with regard to their mechanical and chemical properties are briefly summarized as follows : 1. Soils were clasified into clay loam, loam and sandy loam, and sandy loam and sandy loam soil with much gravel. 2. SiO_2-Al_2O_3 ratio of clay fraction was 4.14〜2.96 in surface soil and no remarkable difference was found in deeper horizon. 3. Humus and nitrogen contents were low in surface soil and was decreased with deeper horizon. C : N ratio was 18〜10 in surface soil also narrower in deeper horizon. Available phosphoric acid was very low in each horizon. Available potash was not so low as phosphoric acid. Following table shows these contents in surface soil.[table]4. pH value was 5〜6. Exchangeable base was generally insufficient, i.e., Ca 5.49,Mg 3.64,K 0.48,Na 0.89 m.e./100 g. on an average. Ca occupied the most part of bases in surface soil, but the proportion of Ca was decreased and that of Mg increased with depth. Saturation degree of surface soil was 44.90〜11.99.
社団法人日本土壌肥料学会の論文
1941-06-25