The purpose of this paper was to investigate and compare students' knowledge and attitude

towards community's tree ordination before and after attending a tree-ordination promotional

training. The sample were 30 undergraduate students majoring in Environmental Education at

a university in the northeast of Thailand. The research tools were a tree-ordination knowledge

manual, a tree-ordination knowledge test, and the attitude questionnaire. The statistics used

for data analysis were frequency, percentage, means, standard deviation, and paired t-test.

The results showed that before the promotional training, the students had the tree-ordination

knowledge at the fair level. However, after the promotional training, their tree-ordination

knowledge increased to the good level. When comparing the mean scores between before and

after the intervention, it was found that the students' knowledge on tree ordination after the

training was significantly higher than before the training at the significance level of .05. In

terms of their attitude towards tree ordination, before the promotional training, the students'

attitude was at the fairly agree level, but it changed to strongly agree level after the

training. When comparing the mean score between before and after the training, it was found

that the students had much more positive attitude after the training than before the training

with the significance level of .05. It can be concluded that the designed tree-ordination

promotional manual is effective and can be used as a tool for promoting tree ordination in a

community.