They are a sowing machine, field leveling plow and rice bed plow.

Choe Kil Nam, a researcher of the college, told KCNA that the tractor-drawn machines are used for rice cultivation.

The numerical control sowing machine, low in production cost, sows rice, wheat and barley without harrowing fields.

It, based on a single-chip computer control technology, simultaneously levels field and makes rice bed and furrow.

The plows have already proved effective in cooperative farms.