What must be included on seed packaging for corn?

The correct answer focuses on the inclusion of the approximate Corn Heat Units (CHU) rating on seed packaging for corn. This is crucial as the CHU rating provides valuable information about the growing conditions and environmental adaptability of corn hybrids. It helps farmers make informed decisions on which variety of corn to plant based on the climatic conditions of their specific region.

The CHU rating effectively correlates with the length of the growing season and the number of heat units available for corn growth. This metric is essential for optimizing yield potential and ensuring that the chosen variety will mature appropriately within the local climate parameters.

While moisture content might be significant for seed handling, it's not a regulatory requirement for packaging in the same way that CHU ratings are. Similarly, while treatments, such as seed coatings, might also be useful information for farmers, they do not directly impact the physiological aspects of the corn plant during its growth cycle in the way that CHUs do. Suggested planting depth does not appear on seed packaging as a required element, making the CHU rating the most critical piece of information for the target audience of corn growers.