本邦柑橘園土壌に関する研究(第三報) : 神奈川県の柑橘園土壌に就て

概要

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Kanagawa prefecture is one of the chief districts of citrus production in Japan. A study was made with the soil of citrus garden in this prefecture and obtained analytical data with regard to their physical and chemical properties. The results are summarized as follows : 1. From the results of mechanical analysis, soils were mostly classified into loam and clay loam. 2. SiO_2-Al_2O_3 ratio of clay fraction of soils was generally low in surface soil, i.e., 1.30〜2.19. The ratio showed minimum in middle horizon and increased in deeper horizon. 3.Humus and nitrogen contents were commonly high in surface soil and decreased with depth. C : N ratio was about 10 in surface soil and much higher in deeper horizon. Available phosphoric acid was very low even in surface soil while available potash was generally high throughout horizons. These contents in surface soils are given in the following table. [table] 4. pH value of soil was 5〜7. Exchangeable base was sometimes rather sufficient and the average of surface soil was Ca 12.28,Mg 4.14,K 0.78,Na 0.54 m.e./100g. The most part of bases was Ca in surface soil but in deeper horizon Mg took the place of Ca. Saturation degree of surface soil was very low and increased with depth.
社団法人日本土壌肥料学会の論文
1941-01-25