Each line has a monetary value. This will be the biggest charge in the contract. Check for planting date so as not to lead into frost threat. Compensation for frost damage is generally much less.
Some companies deduct all costs from the first crop payment.
The company may endeavor to harvest but may not guarantee that it will harvest the crop. Premature harvest may become a problem. If harvest is at the convenience of the company, this may cause ruts, compaction, etc. A yield bonus is actual tonnage divided by contracted acreage. Some charges are hidden under their respective parts of the contract.