Traveling through the second year of Zhenguan, there coincided with a severe drought in Guanzhong, with cracked fertile fields, soaring food prices, panic in the court and people displaced. Su Changfeng mastered modern agricultural technology and planted sweet potatoes with a yield of three thousand kilograms per mu on a wasteland slope outside the city. He also cultivated a new pepper crop. By chance, he encountered Li Shimin, who was investigating in private. He amazed the emperor with his unparalleled grain crops, broke the absurd situation of the Tang Dynasty with one acre of fertile land, and supported the livelihood of all people in the prosperous Tang Dynasty with a bumper harvest of grains.
