煤干石俗名煤渣或矿渣,是煤矿生产中的最大副产品,资源极为丰富。在毛主席革命路线指引下,我社广大贫下中农、革命干部和科技人员,遵照毛主席“放手发动群众,一切经过试验”的教导,从一九五八年就开始利用煤干石当肥料,经过八 Coal dry stone Common name cinder or slag, coal mine is the largest by-product of production, resources are extremely rich. Guided by Chairman Mao’s revolutionary line, the broad masses of our poor peasants and middle peasants, revolutionary cadres and scientific and technological personnel, following the teachings of Chairman Mao, “let go and mobilize the masses and all have been tried out.” Since 1958, they began to use coal, dry as fertilizer, After eight