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By Mark Hanna, Department of Agriculture and Biosystems Engineering

High nitrogen fertilizer prices have producers and ag-input suppliers searching for ways to reduce costs and gain efficiency. Some anhydrous ammonia applicators have responded by modifying equipment to allow control of flow to individual sections of an applicator, or even to individual knives. These modifications are being made in order to avoid unwanted N application on overlapping rows, near field boundaries, or into waterways.