In the soybean world, Kip Cullers is the equivalent of a rock star.

He's the undisputed world champion of soybean production and he's spilling the beans, so to speak, on his record-shattering secrets.

"Anyways, uh, I always work under the theory that once they start blooming you want to remove as much stress as possible," Cullers told farmers from as far away as Brazil and Canada who were hanging on his every word like he was a preacher at a church revival meeting.

"It's just like if you feel good, you want to run that extra mile," he said.

More than 2,000 farmers came to tour Cullers' farm this week, to learn from the master. Cullers doesn't look like much of a professor as he leans against the podium in a circus tent erected on his farm. Tall and reedy as a beanpole, he looks more like the farmer he is.

And he's quite a farmer. Last year, Cullers grew 154 bushels of soybeans per acre. That's almost four times the national average.

Cullers has taken the soybean crown for two years in a row in a highly competitive market. But it isn't just a contest. In a world where there are more mouths than ever to feed, boosting crop yields is big business.

Cullers' peers hold him in awe.

"I think you almost have to be at a genius level to do what he's done. You've got to be thinking 24 hours a day," said Aaron Hicks, a burly corn and soybean farmer from Henrietta, Mo. Hicks said he worked his heart out last year to yield 45 bushels of soybeans per acre.

Revealing his secrets, Cullers makes them seem almost deceptively simple.

He waters his soybeans daily to cool and nourish the plants, a move that surprised some farmers who wait until leaves droop to turn on irrigation faucets. He uses the irrigation spray to apply fungicides late in the season so soybeans can fatten their pods instead of fighting infection.

For fertilizer, Cullers uses chicken litter from industrial barns near his farm, applying about 3 tons an acre. It costs between $40 to $60 an acre, giving him an advantage over farmers who must use increasingly expensive synthetic fertilizers like anhydrous ammonia, which cost $523 a ton in 2007 according to the U.S. Department of Agriculture.

Finding the right soybean variety is crucial. Cullers like them short, because he plants them close together. They compete for light, and he doesn't want them to grow so tall they bend over and form matted tangles.

"We want miniature Christmas trees out there," he said amid the scratching of pens and pencils as farmers furiously scribbled down his advice.

Researchers around the world are racing to discover new technologies to boost crop yields as farmers strain to grow enough food on a limited amount of arable land.

Monsanto Co. set the ambitious goal of doubling yields of corn and soybeans by 2030. Pioneer Hi-Bred, a division of DuPont Co., plans to boost yields of its seeds by 40 percent within a decade.

Agribusiness groups say boosting yields is more important than ever as growing middle class populations in China and India eat more meat, which requires vast amounts of grain to feed livestock. Using crops as stock for biofuels like ethanol and biodiesel increases the pressure.

A day on Cullers' farm shows why boosting yields can be so difficult.

It's not just a matter of adding more fertilizer or planting more seeds per acre. It's like playing a three-month long game of chess, except the rules allow pieces to be swept off the board randomly by floods, hail storms or swarms of beetles. Continued...