The US and EU are likely to impose limited political sanctions on officials of the ruling Cambodian People's Party following the election in July, which was neither free nor fair. Nevertheless, broader economic sanctions hitting Cambodia's trade privileges are unlikely, owing to the large negative impact they would have on the country's economy. Meanwhile, despite the recent token release of some prisoners, the space for opposition political forces will remain severely restricted in 2018.
As a result of that, I am not quite sure how blockchain can help farmers in Cambodia, to be honest. On the one hand, it might help the farmers in order for them to have their own monetary system. On the other hand, it does not help at all because of the trade sanctions and their likely loss of trade privileges.