Teamkao, Pattrarat

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Teamkao, Pattrarat
Alternative Name
Teamkao, P.
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Email
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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    Effects of soil moisture content and arbuscular mycorrhizal fungi on phosphorus fractions in soil
    (2020-01-01)
    Chudaeng, D.
    ;
    Teamkao, P.
    The results of the investigation showed that soil moisture significantly affected Pwater, P-loosely, P-Fe and P-apatite. P-loosely and P-apatite contents were higher than the control, while P-water and P-Fe contents were high at 75% of soil water holding capacity (WHC) after 90 days of experiment. Arbuscular mycorrhizal fungi (Glomus sp. and Acaulospora sp.) inoculation significantly differed in P-Al, P-Ca and P-apatite contents. AMF inoculation reduced amounts of P-Al, P-Ca and P-apatite in soil. Interaction between soil moisture and AMF significantly differed in P-loosely and P-apatite with. P-Fe, P-Ca and P-apatite increased while P-water, P-loosely and P-Al decreased. It showed that drought stress reduced P-water content, while AMF addition reduced unavailable phosphorus forms of P-Al, P-Ca and P-apatite in soil.