ABSTRACT
Fertilizers are inorganic materials of a concentrated nature, applied to increase the supply of one or more of the essential nutrients. Complex fertilizers contain two or three primary plant nutrients of which two primary nutrients are in chemical combination. For example, diammonium phosphate. Fertilizer calculations help to compute the correct amount of fertilizer material to be applied to a given area at the recommended rate. Conditioners are added to fertilizer mixture during their preparation for reducing hygroscopicity and improving physical condition. Such materials may be tobacco stem, peat, groundnut hull and paddy husk etc. A filler is the make weight material added to a fertilizer mixture. The common filler material used are sand, soil, ground coal ash and various other waste products.
