Ratchaburi (Ratchaburi province, Cental Thailand) The site were situated on the lateritic
gravelly materials at the former river terrace after clearing the forest to obtain fuel wood for
local limestone mining and ceramic production. Very high temperature and long dry period
accelerated the hardening of surface soil materials, which make it possible to regenerate only
thorny scrub. During 5 years, the rain fall ranged from 844 ta 1322 mm per annum, and 4 to 6
months of drought were observed. The highest monthly mean temperature was found in April
(30.4 to 31.4'C), and the lowest was in December or January (22.5 to 24.5C). Original
vegetation was dry dipterocarp forest. Experimental site is located on the foot slope to small
valley bottom with a maximum slope of 4' and average of 3'. As for the silvicultural species,
Eucalyptus camaldulensis and Pterocarpus mrrcrocarpus was used, while for the agricultural
trial, cassava, pineapple, and maize were grown with a combination of fertilizer application.