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eKonomics News Team

Virtually everyone in the industry agrees that fertilization is required when soils fall below the critical level for P and K. But that’s where the consensus ends. The real debate begins when determining a course of action for fields right at that critical level. Fertilize? Or not to fertilize? In this video, Dr. Robert Mullen explains the difference between the Maintenance and Sufficiency Approaches to fertilization and offers his opinion on what method he recommends to ensure farmers get the most out of their fields.

When fields reach critical levels for P and/or K, farmers face two choices

The Maintenance Approach

Action: Fertilization is required.

Result: Nutrient application ensures the entire field is above the critical levels for P and K, thereby maximizing yields.

The Maintenance Approach

The Sufficiency Approach

Action: No fertilization required.

Result: Although the field has an average at or above the critical level, some areas of the field may still fall below the critical level. Therefore, the farmer risks yield loss in order to save on nutrient costs.

The Sufficiency Approach