AGRI-FORESTRY AND SOIL CONSERVATION -- Silkworm raising at the Guanxu People mulberry trees grown for soil conservation provide food for 10-day-old silkworms. - - In 1949, China's forests covered a mere 5 percent of its total land area. Through diligent afforestation efforts, this cover was increased to 12.7 percent by 1978. Working only on non-agricultural land, the national policy of tree planting continues throu