ACID INPUT AL RELEASE Ai H EXCHANGE H accumulates in soil SURFACES Ca Mg. K, and Na are removed with anions CATION M A LEACHING HA= acids(H, CO3, HNO3, H2SO4, organics H hydrogen ion (HCO3,NO3,S〔 organic) M =exchangeable metal cations Ca2+, Mg2+,K+,Na+ Roles of acid input, cation exchange, and leaching in soil acidificationRoles of acid input, cation exchange, and leaching in soil acidification