Such plantations, if done upon a considerable commercial scale, involve engineering problems and the careful Terracing of each tree, and, except for a dearth of more suitable locations, is a practice that has little to commend it to the practical grower.
"Cacao Culture in the Philippines"
William S. Lyon
There is good reason to believe that the Terracing shown in its interior is mainly due to the repeated alternate rise, partial congelation, and subsequent retreat of a vast sea of lava.
"The Story of the Heavens"
Robert Stawell Ball
Terracing may be indigenous to many isolated areas where it is found, and doubtless is to some; it is found more or less marked wherever irrigation is or was practiced in ancient or modern agriculture.
"The Bontoc Igorot"
Albert Ernest Jenks