Teamkao, Pattrarat

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Teamkao, Pattrarat
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Teamkao, P.
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pattrarat.te@kmitl.ac.th

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    Item type:Publication,
    Floods increase soil microbial activity in paddy soil: A case study in Sakon Nakhon province, Thailand
    (2020-01-01)
    Teamkao, P.
    ;
    Lapontun, K.
    ;
    Onkum, P.
    ;
    Chudaeng, D.
    ;
    Saipluemchit, S.
    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.
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    Soil microbial activities in Alfisol with different green manure application
    (2020-01-01)
    Onkum, P.
    ;
    Teamkao, P.
    The result showed the highest soil respiration in green manure from African sesbania application was 0.5478 mgCO2/g soil. The lowest microbial biomass nitrogen (MBN) found in green manure from cowpea application was 29.68 mgCO2/g soil. MBN was found at the highest value in non-application of green manure (control) at 2.20 ng/g soil after 30 days application. Urease activity was the highest in green manure from African sesbania at 12.58 μg NH4-N/g dwt. However, activities of cellulase, protease and acid-phosphatase were not statistically differed between treatments. Enzymatic activities increased with the highest activities found at 20th and 30th days after application. The green manure from Soybean promoted the highest microbial biomass while green manure from jack bean promoted the highest soil respiration. The enzymes were changed, except for urease. Decomposition rate related to plant quality to control activity in soil.