洪積期火山灰土壌に関する研究-1-土壌中におけるカルシウムの移動について

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After reclamation of the field of volcanic ash organic soil (heavy acid), and liming materials (slaked lime hydrated from calcined lime, slaked lime, ground calcitic limestone, ground dolomite and slag) were incorporated in the first layer (depth 0-10cm) of fresh soil. After about four years under non-planted bare field condition,contents of calcium and magnesium in each layer of soil were determined with N/2-hydrochloric acid extraction and the degree of movments of applied calcium and magnesium from the surface layer to the sub-layer of soil was clarified in the field experiment. In this report, the results obtained concerning calcium will be summarized as follows. 1) The effects of application of ground calcitic limestone and ground dolomite were better than that of slag. 2) In the application of the liming materials, pH of the first layer (depth 0 -10cm) was markedly increased, but pH of the second (depth 10-20cm) and the third layer (depth 20-30cm) was slightly higher than that of the non-treatment, and pH of below the fourth layer (depth 30-40cm) was almost same as that of the non-treatment. 3) In the application of the liming materials, changes of volume weight of soil were slightly from the non-treatment. 4) In the ground dolomite application, solubility of calcium with N/2-hydrochloric acid was lower than that of the other liming materials. 5) After about four years, contents of N/2-hydrochloric acid soluble calcium in the second and the third layer were slightly increased. From the first to the third layer, as to the total amount of N/2-hydrochloric acid soluble calcium was greater in ground dolomite than that in slaked lime. But the calculated amount of calcium moved to below the fourth layer was greater in slaked lime (20.1%) than that in ground dolomite (0.5%).
信州大学農学部の論文

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大槻貞男
信州大学農学部

洪積期火山灰土壌に関する研究-1-土壌中におけるカルシウムの移動について

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