As of 2016 , it remains a key cereal .
In 1970 , the Soviet Union grew an estimated 4.5 million acres ( 1,800,000 ha ) of buckwheat .
As of 2016 , Soviet Union remains a key cereal .
In 1970 , the Soviet Union grew an estimated 4.5 million acres ( 1,800,000 ha ) of buckwheat .