Effect of soil conditioner on physical and chemical properties of soil (Agricultural Chemistry)

無機質の埴質土壌に調整剤A-22及び石灰を添加して団粒形成量とその分布状態, 透水性, 置換容量及び燐酸吸収力について実験を行つた。調整剤は土壌に対して0.03%及び0.05%, 石灰はカチオン置換容量に相当する量を加えた。本実験の結果を要約すると次の如くである。(1)団粒形成量については調整剤及び石灰添加の効果が明らかに見られた。(2)透水性は調整剤添加によつて早くなるが, 0.05%区では0.03%区よりも遅く, 石灰の併用は多少阻害する様である。(3)置換容量及び燐酸吸収力については調整剤の添加量と共に増大した。
A soil conditioner, A-22,was applied to an inorganic clayey soil. Lime was applied combined with the soil conditioner. The amount of lime was just equal to the cation exchange capacity of the soil, and the amounts of soil conditioners were 0.05 and 0.03 per cent of the soil weight. Experiment was carried out on the effect of the soil conditioner on aggregate formation, water permeability, cation exchange capacity and phosphorus adsorption. The results are summarized as follows : 1) Formation of soil aggregate was remarkably affected by the application of soil conditioner and lime. 2) Water permeability was increased by soil conditioner. The increase by 0.03 per cent application was larger than the increase by 0.05 per cent application. Slight decrease of permeability was observed by the addition of lime. 3) Cation exchange capacity and phosphorus absorption of the soil increased by the application of soil conditioner.