Ling Mochuan, a doctor of chemistry who studied in Germany, returned to China and witnessed foreign companies in the concession monopolizing fertilizers and strangulating the food supply in Jiangnan. He synthesized domestic ammonium sulfate in a humble house in Shanghai, but encountered farmers' doubts and comprador attacks in the fields. It uses rigorous experiments to shatter rumors, connects rural areas with "mobile fertilizer laboratories", and ignites scientific fires with vernacular manuals. When data turned into sharp blades and golden waves surged in the fields, a "fertilizer war" without gunpowder finally held up the heavy ears of wheat with bare hands, guarding the first line of "food" opportunities for the precarious Republic of China.
