THE METHOD FOR MEASURING OF WATER REPELLENCY OF SOIL
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概要
- 論文の詳細を見る
This study is an attempt to establish an evaluation method of water repellency of soil ranging complete wettability to complete nonwettability. The principal used was the theory of capillary rise. The samples were packed into teflon tubes which are very hydrophobic and placed at a certain depth in water. In this method, the height of capillary rise of very nonwettable sample would remain under the free water level even for an infinite time. On the other hand, the wetting front of the wettable samples would be above the free water level for an infinite time. This method is considered to be suitable for both wettable and nonwettable samples. It was found that not only wettable samples but also nonwettable samples changed to be completely wettable by heating at 250℃, and also that this change was particularly remarkable in the case of humic acid. From the ratio of the maximum height of capillary rise of the sample heated at 105℃ to that of the sample heated at 250℃, the water repellency of the soil sample can be represented as contact angle, whether the sample is very wettable or nonwettable.
- 社団法人日本土壌肥料学会の論文
著者
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Yokoi Hajime
National Institute Of Agricultural Sciences
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Nakaya Norio
National Institute Of Agricultural Sciences
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MOTOMURA Satoru
National Institute of Agricultural Sciences
関連論文
- THE METHOD FOR MEASURING OF WATER REPELLENCY OF SOIL
- SOME ASPECTS ON WATER REPELLENCY OF SOILS
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- EFFECT OF ORGANIC MATTERS ON THE FORMATION OF FERROUS IRON IN SOILS
- SOIL STRUCTURE DEVELOPMENT IN ARIAKE POLDER SOILS IN RELATION TO IRON FORMS
- THEORETICAL ANALYSIS OF TEXTURAL CLASSIFICATION FOR THREE-FRACTION SYSTEM
- STUDIES ON THE GLEY FORMATION OF SOILS I. : On the Mechanism of the Formation of Active Ferrous Iron in Soils
- RELATIONSHIP BETWEEN SOIL COHESION AND SHEAR STRENGTH
- THEORETICAL ANALYSIS OF PARTICLE-SIZE DISTRIBUTION : An Approximation to Continuous System
- CHARACTERISTICS OF FERROUS IRON FORMS IN PADDY SOIL WITH REFERENCE TO DEVELOPMENT OF THE SOIL PROFILE