The results showed that the different flooding histories caused the effects on some
soil properties. Partially flooded areas had the highest soil electrical conductivity at 0.06 mS/cm,
but in the range that did not affect plant growth. All studied areas had low levels of organic
matter and fields had available phosphorus of less than 4 mg/kg. There was a low level of
exchangable potassium under fully flooded areas but a high level under partially flooded and
non-flooded areas. The microbial activity revealed the highest soil respiration under fully
flooded areas with 0.16 mgCO2/g soil. The highest bacterial and fungal populations, FDA
activity, urease, dehydrogenase, and protease activities were found under fully flooded area
conditions. However, soil pH, microbial biomass carbon, microbial biomass nitrogen, and acidphosphatase
activity were not statistically different. No pesticides in carbamate, organochloride,
and organophosphate groups were observed. The amounts of mercury, arsenic, lead, and
cadmium were lower than the standard set of Thailand. Flooding did not reduce soil quality in
the areas of the study; on the other hand, increased microbial activities were beneficial for plant
growth. The effects of flooding on soil properties might differ depending on the conditions in
each area.
Keywords
Floods, Soil chemical property, Microbial activity, Soil enzyme
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
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