Tips to compare corn maturity

摘要

CORN hybrid maturity ratings help growers select and compare hybrids, manage agronomic risk and spread harvest timing. What is often misunderstood by growers is that there is no industry standard for these ratings, so comparing hybrids between companies can be challenging. Hybrids are typically rated for CRM (comparative relative maturity) or RM (relative maturity). In the U.S., this is reported in calendar days such as a 105-day hybrid. In Canada, hybrid maturity is reported as CHU or corn heat units such as 3,100 CHU. Multiplying the day-length of a U.S. hybrid by 30 will approximate the CHU rating (100-day corn CRM roughly equals 3,000 CHU hybrid).