土質改良剤に関する研究(第3報)

抄録

The efficiency of soil conditioners for the formation of water stable aggregate with various conditions was investigated. The results were as follows : 1) The water stable aggregates of soils treated with three synthetic soil conditioners, such as Krilium, carboxy methyl cellulose and A-22,were estimated by modified YODER'S method. And we observed that the soil contained many small particle size had the excellent water stable aggregate forming efficiency. And so it was seemed that the particle size of the soil was an important factor for the water stable aggregate formation by the soil conditioners. (Table 1,2) 2) The water stable aggregates of the soils treated with 6% H_20_2 were estimated and their values were compared with those of original soils. Consequently, it was seemed that the humus in soils did not affect the water stable aggregate forming efficiency with the soil conditioners. (Table 2) 3) To pursue further the significance of the particle size of soils for the formation of water stable aggregate, coarse sand, fine sand, silt and clay were separated, and the each particle was treated with three kinds of methyl cellulose. The absolute viscosities of 1% water solution of them were 1,500,400 and 100 centi pois, respectively. And it was seemed that clay had the most excellent water stable aggregate forming efficiency, the silt was the next, the coarse sand and the fine sand not form aggregates. (Table 3)