四川省达县开展了群众性的土法制造火硝运动(每户熬三斤),解决了炸药不足的困难。达县群众过去有挖老墙脚土制造火硝的经验。但是,老墙脚土有限,不能满足需要。今年试验成功,用人功培养硝土,制造火硝(可以制造土炸药)。制造方法是,每一千斤土(潮湿、质松、含砂的土宜于生长火硝),加一百斤到一百五十斤尿或稀粪拌匀后,放在阴湿的地方发酵(温度最好是摄氏二十六度至二十八度),经过二十多天成为硝土,就可以从中 Daxian County, Sichuan Province carried out mass-produced turf movements (three pounds per household) to solve the problem of insufficient explosives. The people of Daxian County used to dig the old walls to make firewood. However, the old wall is limited in soil and cannot meet the needs. This year’s experiment was successful, using human power to cultivate nitrates and to create oxynitrite (which can make earth explosives). The manufacturing method is that every kilogram of soil (moist, loose, sandy soil suitable for the growth of fire), plus 100 pounds to 150 pounds of urine or dilute feces after mixing, on the wet place Fermentation (temperature is preferably between 26 and 28 degrees Celsius), after more than 20 days to become nitrification,