The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
fertilizers obtained on farms. They include ash and the majority of organic fertilizers (manure, liquid manure, composts, and peat). Local fertilizers contain all the minerals (N, P, K) and trace elements essential to plants.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.