Soil potassium status and adsorption characteristics of Thai lowland vertisols

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Timtong Darunsontaya
Wittaya Jindaluang
Pinida Kunmala

บทคัดย่อ

Lowland clayey soils dominated by 2:1 clay minerals are generally believed that application of K fertilizers are not necessary, particularly in Thailand. However, there is evidence that many of them contain only low levels of available K and thus K fertilizer application is required. This study aimed to investigate the distribution of K forms and K adsorption characteristics of Thai lowland Vertisols. Topsoil and subsoil samples of five representative soils were analyzed for various K forms and K adsorption characteristics. The results showed that available K content (water soluble K + exchangeable K) in Thai lowland Vertisols varied from low to high (64.3-120 mg/kg) in topsoils and very low (24.9-46.5 mg/kg) in subsoils. However, all soils had a very low K reserve (13.6-102 mg/kg). The K saturation values of these soils (0.06% – 0.95%) were far below critical value (1.5%), indicating that only a very small proportion of the CEC was occupied by K+.  Potassium adsorption was showed a good fit with the Freundlich isotherm only. The adsorption capacity (Kf) values of these soils were negatively correlated with the organic matter and extractable K contents in soils. Whereas the rate of K adsorption (1/n) was positively correlated with available K content and K:Mg ratio.

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