AbstractOn grassland, raw ammonia liquor from gasworks (0.75–2.30% N) may be a useful source of nitrogen. In a large series of experiments it was not so effective as ammonium sulphate. Precautions must be taken to avoid scorching the grass with the liquor, as such scorch has very serious effects. Experiments with concentrated ammonia liquor (about 12% N) on potatoes and swedes suggest that this material may have toxic effects.