A Toposequence of Fine-Textured Soils in the Hilly Area of the Northernmost Part of Hokkaido : III. Importance of Chelating Low Molecular Organic Acids in the Migration Process of Aluminum and Iron

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The enrichment process of 2,4-D degraders in soil under upland conditions was investigated using samples of a mineral soil and an Ando soil which were stored or not stored. A remarkably higher population of 2,4-D degraders in soils was found when the enumeration was performed using a mineral medium compared with the nutrient broth medium in the MPN method. The population an proliferation rate were proportional to the degradation rate of 2,4-D in the soils examined. 2,4-D was degraded after a longer lag period in the mineral soil after long-term storage than in the fresh soil, but the duration of storage than in the fresh soil, but the duration of storage did not affect the degradation rate of 2,4-D degraders decreased through long term soil storage, a longer lag period was required for the proliferation of the degraders to cause an appreciable degradation of 2,4-D in the soil. Storage of the Ando soil did not affect the population size of the degraders and the degradation rate of 2,4-D in the soil. In the mineral soil, a higher concentration of 2,4-D resulted in a longer lag period for 2,4-D degradation, and 100 ppm of 2,4-D suppressed the proliferation of the degraders. These results indicate that the duration of the lag period for 2,4-D degradation in soil depended on the population size of 2,4-D degraders before the application and on the application and on the concentration of 2,4-D.
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