In Humid Regions Repeat Applications of Limestone Are Needed After

Multiple Choice

In humid regions repeat applications of limestone are needed after a few years primarily because of ____.

A) the release of aluminum ions from the structure of silicate clays
B) the annual loss of calcium and magnesium in drainage waters
C) increases in soil acidity from acid rain
D) increased rates of formation of carbonic acid (H₂CO₃)
E) increases in phosphate fertilization