COMPARISONS OF LIQUEFIED (ANHYDROUS) AMMONIA AND AMMONIUM NITRATE AS NITROGENOUS FERTILIZERS FOR GRASSLAND

Three trials were conducted to compare liquefied ammonia and ammonium nitrate as nitrogenous fertilizers for grassland. One was at Jealott's Hill and the other two at Henley Manor, Crewkerne, Somerset. At neither centre was the response to liquefied ammonia as great as that from equivalent rates of ammonium nitrate applied in a number of split dressings throughout the season.
Split applications of liquefied ammonia were more efficient than single large dressings, but even these were not as efficient as ammonium nitrate.
The response from a single large application of liquefied ammonia in spring was superior to that from an autumn application, especially under the high-rainfall conditions at Henley Manor.
The pattern of response from split applications of ammonium nitrate was more uniform than that from a single application of liquefied ammonia. In general, the latter gave a large mid-summer cut, but fell away badly at the end of the season. These data confirm earlier findings, which also showed that liquefied ammonia was not as efficient as ammonium nitrate applied in the normal way as a nitrogenous fertilizer for grass.