It depends on how good the corn is and how much corn grain the field has produced, but it could be as much as $3,000. This assumes you are asking about ordinary field corn. Specialty types of corn can be worth much more. I know of one instance where a farmer received over $5,000 per acre (gross value before input costs taken out) for a crop of hybrid sweet corn seed.
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This is completely dependent on the circumstances. It might cost a subsistence farmer in the third world next to nothing because he is planting open-pollinated saved seed, fertilizing with manure from his livestock, and using his family's labor to control any pests. A commercial farmer in the US producing a specialty seed corn crop might invest $1,000 an acre in the crop.
The average commercial farmer in the midwestern US growing an average non-irrigated feed corn crop will probably have invested $300 to $400 an acre in the crop by the time it's ready to harvest. This does not, of course, include overhead costs such as machinery, land, and storage facilities.
The average acre of corn in 2019-2020 is worth about $640.00 As a farmer, I know this.