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A portable device to inject liquid chemicals and anhydrous ammonia in conventional bales was constructed and tested. Injecting anhydrous ammonia at a rate of 1.5% of hay dry matter proved to be as beneficial to the nutritive value of mature Alicia bermudagrass hay as 3.0% application rate using the conventional method of adding ammonia to a stack. Enclosing the bales in plastic was necessary when injecting with anhydrous ammonia. Injecting a 50% urea solution did not prove to be beneficial to the nutritive value at any application rate. Injected urea solution did not distribute evenly throughout the bale, whereas anhydrous ammonia penetrated the bales well.