In recent months alone, plastic-tube greenhouses made their appearance at factories and co-op farms in Maengsan, Onchon and other counties.

Those greenhouses have proved easy in building and economic.

The plastic-tube greenhouse is three times longer than greenhouse with steel frame in durability.

Plastic tubes are being produced by the Songyong Building Materials Factory in Rangnang District, Pyongyang.

According to Manager Choe Nam Chol, the factory has excellent production processes for manufacturing plastic tubes of different sizes, colored plate roofing and plastic sheet.

The demand for plastic tube is expected to be steadily increased, he said.