He went round several greenhouses to learn about their construction and production there.

He asked what kinds of vegetables they cultivate at present, how they ensure heating in winter, how do they ventilate in summer and what quantities of vegetables they produce in a year.

It is gratifying that the Songhak Co-op Farm built the vegetable green houses with large production capacity by itself, produces various kinds of vegetables and supplies them to the farmers, he said.

He said he was pleased to learn that the farm built greenhouses by using locally available materials to suit the actual conditions of rural areas. He called on the farm to operate the greenhouses well so that its members may substantially benefit from them.

He said that to build vegetable greenhouses in various places and effectively operate them is very important for overcoming seasonal limitation in vegetable production and providing the people with fresh vegetables all the year round.

He stressed the need for a national institution to provide a standardized design for greenhouses to be built in provinces, cities and counties, organize contests among them and take measures for summing up them.

It is necessary to boost the per-area yield of vegetables at greenhouses, he noted, underlining the need to build greenhouses to suit the local climatic and topographical conditions and put the production on a scientific and technological basis.

He said that there should be good conditions including temperature, humidity, light and soil suitable for the nature of vegetables in greenhouse cultivation and a high yield can be expected when vegetables are distributed in greenhouses to suit the biological characteristics.

He stressed the need for the Pyongyang Vegetable Science Research Institute to work out a scientific and technological guidebook to distribute it to all greenhouses and called on them to put vegetable cultivation on a scientific basis.

If a greenhouse is to cultivate several kinds of vegetables a year, it is necessary to sufficiently apply chemical fertilizers along with organic compost, he said, underlining the need to establish a state work system for supplying agricultural chemicals, fertilizers and seeds to the greenhouses.

"There will be no problem in the construction of vegetable greenhouses if vinyl sheet is mass-produced at the Namhung Youth Chemical Complex", he added.

He expressed expectation and conviction that all fields and units would deeply understand the significance and importance of building vegetable greenhouses and make a positive contribution to successfully carrying out the WPK's policy on ensuring abundant diet of the people.

He was accompanied by Choe Ryong Hae, Pak Thae Song and Kim Yong Nam, secretary of the South Phyongan Provincial Committee of the WPK.