* Advantages
Rural labours become rarer and more expensive;
Some farmers become richer and can afford to buy farm machinery;
More and more machinery servicing groups established.
* Constraints
Lacks of national strategies of development in agricultural mechanisation;
Weakness of the domestic manufacturing industry of agricultural machinery;
Small scale rice production and low income farmers;
Small size rice fields with soft soil crossed by many rivers and canals;
Lack of researchers for R&D, testing and selection of farm machinery; and technicians for training of machinery users;
Small scale production of farm machinery with no standards causing problems for users;
Weak services after sales;
Low efficient using of machinery by non-professional servicing people;
Little government supports for servicing groups and manufacturers;
Lack of international supports for agricultural mechanisation;
Climate change.