r mu of land can easily exceed five hundred kilograms, almost double that of wheat or corn."Li Chen's eyes sparkled with extreme excitement as he said to Liu Sichun, "Now, do you know why I was so eag... tech.Driven by a sense of urgency, Li Chen, who had already decided to develop gunpowder guns, pondered over the plan. He ignored Gong Huiyu on the rooftop, who was fuming with indignation due to th...