I/the wife have 17 Rai. We grow Cassava for the sole reason that cassava was being grown on the land when we bought it and the surrounding Rai owned by various members of her family is also used for cassava.
We live in the UK with about 3 visits to Thailand a year. We rely solely on her family to farm the land for us. Its a pain in the ass not being there as you can imagine.
From what i can see they plant the seeds, watch it grow and then harvest it.
Once this is done the land just lies empty and unused until the who cycle starts again.
What do other folks do with there rai when its not being used or is this a common practise to leave it empty for periods of time