Kinetics of Potassium Release of Lowland Soils in Central Plain of Thailand
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Abstract
The study on kinetics of potassium (K) release in lowland soils, Central Plain of Thailand was carried out by selecting representative soils with different soil development from 10 areas. The studied soils included Sapphaya (Sa1, Sa2), Ratchaburi (Rb), Bang Phae (Bph1, Bph2), Bang Len (Bl1, Bl2), Nakhon Pathom (Np1, Np2) and Pak Tho (Pth) soil series. The soil samples were collected at Ap horizon and under Ap horizon to 60 cm depths. The kinetics of K release was studied by extract soils with Mehlich 1 and K content was determined at various times from 1 to 168 hours. The data then were fitted by various equations to describe the release of K from soils. The result showed that Np1 soil series had the highest K release (816 mg kg-1) while Pth soil series had the lowest K release (240 mg kg-1). Kinetics of K release for Bl1, Bl2, Bph1, Bph2, Np1 and Pth were fitted-well by parabolic diffusion and power function equations. These results suggested that kinetic of K release in these soils involved with diffusion process and the rate of K release decreased with increasing time. Kinetics of K release for Sa1, Sa2, Rb and Np2 were fitted-well by zero order equation, suggesting different rate of K release in these soils. At the initial stage of release, K may slowly release from the external sites of clay minerals whereas the rapid K release may occur from interlayer sites of clay minerals afterwards.
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