Various salts and minerals can serve as fertilizer materials. Examples are ammonium sulfate, potassium nitrate, super- phosphate, potassium chloride and potassium sulfate. Examples are urea and ureaform. Cottonseed meal is a by-product of cotton manufacturing. Cottonseed meal is frequently used for fertilizing acid-loving plants, such as azaleas, camellias and rhododendrons.
Blood meal is dried, powdered blood collected from cattle slaughterhouses.
It is a rich source of nitrogen, and it supplies some of the essential micronutrients, including iron. Fish emulsion, a well-rounded fertilizer, is a partially decomposed blend of pulverized fish. The odor is intense but it dissipates within a day or two. Manure is a complete fertilizer, but low in the amounts of nutrients it can supply. Manures are best used as soil conditioners instead of nutrient suppliers.