衰弱茶園土壤に関する研究(第1報)静岡県牧之原洪積台地について
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概要
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In order to research the causes of the decayed tea garden on the central part of the diluvial upland of Makinohara (Shizuoka prefecture), some chemical properties of the tea garden soil were analyzed and the following facts were recognized.<BR>1. The surface-soil (0-18cm.) was composed of brownish-black clay loam with fine granular structure. The sub-soil (18-150 cm.) was composed of light yellowish-brown clay layer of moist condition.<BR>2. The content of clay and the water holding capacity in the sub-soil were larger than the surface-soil.<BR>3. The content of exchangeable Ca was very low and the acidity was generally strong, about pH 4.5 throughout the profile.<BR>4. C/N ratio showed high (24.8) in the surface-soil, on the contrary it was very low (4.6) in the sub-soil.<BR>5. The redoxpotential of the sub-soil under the waterlogging condition was very low.<BR>6. Ferrous oxide was found abundant in the sub-soil, but a few in the surface-soil. From above mentioned results, the drainage may be recommended to increase the soil productivity in this region.
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