The limitation of fertilization as
specific nutrient management of rubber small
holder are lack of plant and soil analysis
Iaboratory, time consumption of the process
and high cost. Nowadays, they can evaluate
soil fertility status quickly by using soil test
kit and the fertilizer recommendation is
revealed by Rubber Research lnstitute of
Thailand. However most of the farmers still
lack of knowledge about this technology.
Organic fertilizer is an alternative
fertilizer application both of immature state
and tapping state, especially in the poor
physical properties of soil such as plantation
area in the No'rth-east of Thailand and
rubber plantation in abandon paddy field that
lack of organlc matter. lt can support the
growth of rubber seedling (24). Whereas in
tapping phase the research results are still
not clear that should do further research.
However, the information detailed in this
review can lead to recommendation for a
proper management of soil for sustainable
rubber plantation which remain to be resolve
scientifically.