It used to be that growers who wanted to inject anhydrous ammonia in their fields basically had one option. Knives, fitted with nozzles and closing wheels, dug a furrow in the ground about 6 to 8 in. deep and filled it with fertilizer. But recently, some manufacturers have introduced an alternative to this called “high-speed, low-draft” (HSLD) applicators that use single-disc coulters instead of knives to place the fertilizer. The new applicators work at a shallower depth, typically 3 to 5 in. Here is just a sampling of coulter-based anhydrous applicators on the market.