Corn, Tires, and Old Adages
The saying knee-high by the fourth of July was long used by farmers to judge the success of their corn crops—it means that growing conditions have been favorable, the crops are off to a good start, and big yields are expected come fall—and the adage remains popular today, despite being antiquated. Innovation in everything from seeds and treatments to equipment and tires has enabled earlier planting and faster-growing, higher-yielding corn.