Abstract
The experimental work reported in this paper deals with the problem of the influence of iron sulfide, which has been formed in polder soils under an anaerobic condition on the change of reaction and soluble salt after drainage. The results obtained may be summarized as follows : (1) In most of soils, the original pH values of waterlogged samples become extremely acid after the incubation at 30℃ under the condition of the moisture content of field capacity for several weeks. Total and water-soluble sulfates are increased greatly in the incubated samples. (2) There appears to be definite relation between the soil color and the content of FeS in waterlogged samples. (3) The content of FeS_2 lies between 0.24% and 0.98% in the water-logged samples but it decreases greatly after incubation. It will be seen from table 2 that the total amount of SO_3 calculated from remained FeS and decreased FeS_2 agrees fair well with that calculated from increased watersoluble sulfates. It is shown that FeS_2 plays an important role in the change of reaction of halogenetic polder soils after drainage.
