Gu Qingshan guards the Liuhe Village Fertilizer Station, insisting on testing the soil plot by plot and mixing fertilizer according to the land, yet is complained about by villagers that a bag of fertilizer is five yuan more expensive, with sixty-eight households collectively refunding and canceling orders. Agricultural input dealer Zhang Mu snatches the orders with cheap fertilizer, and even makes three types of land use a unified dosage and double fertilization. Until the corn roots burn and lodge, and losses approach two million yuan, everyone discovers that what is truly valuable has never been a bag of fertilizer, but Gu Qingshan's professionalism, responsibility, and ten years of steadfastness. The misunderstood Gu Qingshan assists in finding out the truth and completing the final loss-stopping, and also carries ten years of data rushing toward a new experimental field. Low prices have limits, farming time is priceless.