www.iuss.org/.../1974_10_kothpecc__10th_congress_ii_compressed.pdf
Extraction of potassium from twenty one soils with a cation-exchange resin ... Dissociation of exchangeable sodium of clay minerals and soils ..... M.V.Gama und M.L.B.Sousa. ..... Charge a- in moles/cm in a second layer at potential fi and (
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