He said environmental issues affect fertility. Too much rain may leach nutrients away and drought may limit uptake. He cautioned growers to be cognizant of water contamination issues and be wary of nitrogen and phosphorus near bodies of water.

“If we don’t manage nutrients properly, we could be required to get a fertilizer permit and application license. In some areas in the United States farmers already have to develop a nutrient plan and to obtain a license,” he said.

“Agricultural producers are taking care of business and managing nutrients properly. We don’t need regulation.”

He said producers should consider four keys to fertility management: type, rate, method of application and timing. “Also evaluate fertilizer use efficiency, how much gets into the plant.”