Effect of hydroxy-aluminum of the improvement of physical properties of heavy clay soil.
1990
Takuma K. | Kono H. | Hiyama H.
The harrowing ratio and the trafficability of heavy clay soils are low in ploughing work by agricultural machine. These are possible to improve to a certain by improving physical properties of soil. Experiments were carried out by varying the addition rate of hydroxy-Al. The effects of treatment on physical properties, the analysis of waterstable aggregates, the coefficients of permeability and the pF-soil moisture curves of soils were discussed against the rate of addition to cation exchange capacity. Then, the followings were observed. The effects of hydroxy-Al treatment are particularly remarkable on coefficients of permeability, and the effects of hydroxy-Al addition are more remarkable when additions were made after sufficient drying. When hydroxy-Al treatments were applied at site in condition of ponding, soil tilths and trafficabilities seem to show little improvement. When hydroxy-Al treatments were made in farm condition, considerable effects were observed compared with ponding condition. Summarizing the results of experiment, it was found that the effects of hydroxy-Al addition were particularly remarkable when the addition was made and when the water content was lower.
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