New environmentally friendly fertiliser advisory system, based on the data set of the Hungarian long‐term field trials set up between 1960 and 1995

Following the 25‐year intensive fertilisation practice in the country, two‐thirds of Hungarian soils became well or very well supplied with phosphorus (P) and potassium (K). As a consequence of both political and ecological changes in the late 1980s and early 1990s, fertiliser subsidies were withdrawn, and nitrogen (N) use has dropped to one‐fifth, one‐third, P and K use to one twenty‐fifth, one‐twentieth of the amounts used in the early‐mid 1980s. An enormous demand has risen for a new, cost saving, and environmentally friendly fertiliser recommendation system. The new system based on the results of the published long‐term field trial data in the period of 1960–1995 faces the new challenges.