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RYEGRASS (Lolium multiflorum) hay was stored at moisture levels of 40, 30, and 20% in 1982. In 1983 ryegrass hay was stored at 35 and 20% moisture. Half the bales were injected with anhydrous ammonia (NH3) at 3% of dry hay weight. Ryegrass was of higher quality in 1983 than in 1982. Storage losses increased as moisture levels increased in hay not treated with NH3. Crude protein and acid-detergent insoluble protein were significantly increased by NH3 treatment. Unbound crude protein was increased only at the 30% moisture level in 1982 and for bales in bags in 1983. Digestibility of NH3-treated hay was increased by as much as 16% in 1982, but was the same for both NH3-treated and field-dried control bales in 1983.