MT. JULIET, Tenn. (DTN) — Spring crop insurance guarantees for corn and soybeans will be $4.58 and $11.87 per bushel, respectively, increases of $0.70 and $2.70 from last year. For corn, it’s the highest spring guarantee since 2014; it’s the highest since 2013 for soybeans. The guarantees are an integral part of revenue protection crop insurance policies. While farmers have several types of federally subsidized crop insurance to choose from, revenue protection is the most popular. The spring guaranteed prices are calculated by averaging the daily close of the December corn and November soybean contracts throughout February. They’re then combined with the farm’s historical yield average to calculate a level of insurable revenue. Farmers can elect to cover up to 85%, with most farmers choosing to purchase 75%, 80% or 85%, depending on what the premiums are in their area.