HARRISON - Three brothers from Norway are spending their summer farming.

"It's a full-time job," said Nick Costanzi, 20, a sustainable agriculture major at the University of Maine at Orono. He and his two brothers recently sat amid empty produce containers at the Harrison Farmer's Market after selling out their goods.

The brothers spend Mondays and Fridays at the Harrison farmer's market and Saturdays at the Paris Farmer's Market selling the produce they grow at the LolliePapa Farm in West Paris. He and his brother Ben, a 22-year-old library science major at the University of Maine at Orono and Dan, 14, who will be a freshman at the Oxford Hills Comprehensive High School in the fall, have several acres under cultivation.

They have adopted the business name of Costanzi Brothers Organics.

The Costanzis are committed to the concept of sustainable agriculture in the tradition of the biodynamic movement, said Ben Costanzi. Biodynamics is a method of farming developed in the 1920s that stresses the interrelationship between the crops, animals and the land. Manure and compost are used to spur crop growth, and use of nonorganic fertilizers is prohibited. The goal of the crop-growing method, Ben explained, is to keep the soil healthy.

"We didn't really have too much experience with farming before," said Dan on Wednesday. Dan said their father, Carl, spends time almost daily at the LolliePapa Farm helping out, and his interest spurred on the brother's desire to start farming.

Donnie and Jeanette Baldridge, owners of LolliePapa Farm, set aside three or four acres of land for the brothers to establish the Costanzi Brothers' Organics this year.

Ben said by collaborating with the LolliePapa Farm, and the Community Supported Agricultural Program that was started by Pat Verrill, co-owner with her husband, Paul, of Harvest Moon Produce, the brothers have been able to sell their produce directly to the public at the farmer's markets.

"We believe strongly in the value of organic farming, both as a integral step to ensure an enduring, healthy ecosystem, and as a way of maintaining a hearty local farming community," said Ben in a statement that he displays by his produce.

Their produce is uncertified organic, but there have been no chemical pesticides or other nonorganic fertilizers used in the growing process, he said.

The brothers are selling peas, radishes, rhubarb, lettuce, leeks and other produce.

Later in the season, they will be selling tomatoes and other goods.