Yampracha, Sukunya

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Preferred name
Yampracha, Sukunya
Alternative Name
Yampracha, S.
Main Affiliation
Email
sukunya.ya@kmitl.ac.th

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    Item type:Publication,
    Phosphorus-Sorption Characteristics and Phosphorus Buffer Coefficients of Some Important Soils in Lao PDR
    (2015-03-09)
    Souliyavongsa, Xaysathid
    ;
    Yampracha, Sukunya
    ;
    Attanandana, Tasnee
    ;
    Yost, Russell
    ;
    Kanghae, Piboon
    An estimated 97 percent of the soils in Laos are characterized by low phosphorus (P). This characteristic, together with high acidity, constrains food crop production. The P status, sorption, and associated properties were evaluated for fifteen important agricultural soils from the uplands. Soil pH values ranged from 4.5 to 5.9. Soil organic carbon (C) varied from 7.0 to 22.9 g kg<sup>−1</sup>. Soil clay varied from 179 to 709 g kg<sup>−1</sup>. The cation exchange capacity (CEC) also varied from 4.30 to 32.1 cmol<inf>c</inf> kg<sup>−1</sup>. Extractable P levels of thirteen of the fifteen soils were P deficient with medium to very high P sorption, indicating substantial fertilizer P requirements. Dithionite and oxalate aluminum and iron predicted P sorbed at 0.2 mg P L<sup>−1</sup>. The extractable P increase per unit added P, P buffer coefficient (PBC), was low, also indicating high P sorption. Field studies are needed to confirm predictions of P requirements.