抄録
Of manganese in sand soils at Yumigahama Peninsula, Tottori prefecture, some studies were made. The results were summarized as follows : (1) Studied soil cotained much calcium, but little clay and humus, its pH value being nearly 7.0. (2) 0.2 N-HCl solble manganese in the soil was as much as divalent manganese which was active. (3) In the above soil comparatively much iron was contained but little manganese, particularly little divalent manganese which was active, exchangeable and soluble in water. (4) Authors were of the opinion that the tetravalent manganese which was determined as an active manganese was of an unabsorbable. (5) In studied soil there exsited in great quantity not only tetravalent manganese which was active but also the manganese either insoluble or difficult to be dissolved. (6) Exchangeable manganese in applied sandy soil was increased by the addition of the flowers of sulphur as well as such a reducing material as dextrin, and was decreased by the addition of calcium carbonate. By these additions the change in pH values was expected. (7) With regard to the relations between the deficiency in manganese and that in iron, experiments were conducted in water culture with "Hadaka" barley and the following results were obtained. Soluble Fe/Mn ratio in the tissue of a living body in healthy growth was within the limit of the value from 2.6 to 3.5. In case of the value being higher or lower than the limit, chlorotic phenomena took place.
