Chittamart, Natthapol; Suddhiprakarn, Anchalee; Kheoruenromne, Irb; Gilkes, Robert J.
(The Clay Minerals SocietyThe Clay Minerals Society, 2010)
The fertility of soils with respect to K+ and NH4 + is often difficult to measure, but is essential for achieving effective agronomic practices. This problem is especially important in the Vertisols of Thailand. The purpose ...