Farmers will spend more to produce their 2011 crops but they're likely to make that up -- and then some -- from higher grain prices, say two Purdue University Extension specialists.

Which crops farmers choose to plant this season also will play a factor in the returns they'll earn, said Craig Dobbins and Bruce Erickson of Purdue's Department of Agricultural Economics. The numbers suggest a corn-soybean rotation is the best choice, with double-crop soybeans/wheat a good option for those farmers living in areas where that cropping system is viable.

"At this point in time, contribution margins -- the difference between gross revenue and production costs -- are really quite large," Dobbins said. "If one is looking for a place to expend energy from now until you can get out into the field and plant, I think one ought to focus that energy on protecting the margin that you've got in crop production today."

Dobbins, Erickson and fellow Extension specialists in Purdue's departments of Agricultural Economics, Agronomy and Botany and Plant Pathologyexpect farmers to dig deeper into their wallets to grow corn, soybeans and wheat in 2011 than first thought last fall. An updated Purdue Crop Cost & Return Guide outlines those higher cost projections. The online resource is available for free download at http://www.agecon.purdue.edu/extension/pubs/

Since October, fertilizer and diesel fuel prices have gone up, while crop insurance premiums are likely headed higher, the economists said. On the flip side, pesticide and grain dryer fuel prices have dipped.

It adds up to a per-bushel production cost of $4.19 for rotation corn on average-yielding land, up 30 cents from 2010. The projected cost to produce rotation soybeans this year is $9.73 per bushel on average-quality land, a 33-cent jump from one year ago.

Average-quality land is capable of producing 161 bushels per acre of rotation corn and 49 bushels per acre of rotation soybeans.

"Fertilizer prices seem to be one of those areas where the cost increases are most noticeable," Erickson said. "Even though fertilizer prices are up compared to last summer, if you look at them relative to grain prices they're not terribly out of line."

Farmers can expect to pay $151 per acre to fertilize their rotation corn crop on average land this year. That total represents a $17 increase since the October estimate. Fertilization costs are projected to rise another $7 an acre for rotation soybeans on average land, to $69, compared with earlier estimates.

"For a crop like corn that is more energy intensive, we use a lot more fertilizer," Erickson said.

Propane prices have moderated, leading the Purdue specialists to shift their dryer fuel cost projections downward from October. They expect farmers to pay $26 per acre to dry their rotation corn crop from average land, compared with the original $33 estimate.