Fertilizer ingredients are substances that are added to soil to increase its fertility and promote plant growth. The crossword solutions for the term FERTILIZER INGREDIENT include LIME (4 letters), AMMONIA (7 letters), PEAT (4 letters), POTASH (6 letters), UREA (4 letters), MANURE (6 letters), NITER (5 letters), and NITRATE (7 letters). LIME is a calcium-containing inorganic material, such as limestone, chalk, or marble. Ammonia is a compound of nitrogen and hydrogen. PEAT is an accumulation of partially decayed vegetation or organic matter. POTASH is any of various potassium compounds, especially potassium carbonate. Urea is a colorless crystalline organic compound. MANURE is organic matter, such as animal excrement, used as fertilizer. Niter is a mineral form of potassium NITRATE. NITRATE is a salt or ester of nitric acid.