Agricultural crops differ in pH preference, and buffermethods allow
liming rates necessary to attain specific soil pHs. In pond aquaculture,
there is no known reason to attain a specific pH in the bottom soil.
The objective is to increase soil pH and allow greater total alkalinity in
the water (Boyd, 1995). The PB method was designed to neutralize a
large amount of exchangeable acidity and lower base unsaturation as
much as possible. This approach has a considerable advantage because
a graphical relationship between base unsaturation and pH of soils is
not needed. Theweight of pond soils is typically less than that of agricultural
soils; the average dryweight of the 1 ha × 15 cmlayer of pond soil
is about