Like living cells they are influenced both in their organization and in their development by humidity, dryness, acidity, or alkalinity.
"The Mechanism of Life"
Stéphane Leduc
It should also be noted that the alkalinity of a solution should be determined on the basis of hydrogen ion concentration and not on amount of alkali added since many substances have a marked buffer reaction.
"The Vitamine Manual"
Walter H. Eddy
Most farms needing lime do not have cheap supplies, and the consideration is to secure soil alkalinity at a cost that will not be excessive.
"Crops and Methods for Soil Improvement"
Alva Agee