China's top economic planner on Friday ordered local government to free up seed, silkworm cocoon and industrial salt prices.

The announcement on the National Development and Reform Commission (NDRC) website says prices of sodium carbonate and caustic soda, listed as industrial salt in China, will continue to be under government control.

The move will promote an open and uniform national market system with orderly competition.

Local governments must free up such prices as soon as possible, according to the statement.