Liquid fertilizers suspensions

There are many different types of liquid and solid fertilizers but we give only some generalizations about advantages of each. Liquid fertilizers are a clear solution, a suspension of a solid in a liquid (aided by a suspending agent), or a simple slurry of a solid in a liquid. Solid fertilizers contain no liquid. Table 21.3 summarizes the advantages of liquids and solids. 

Mixed solid fertilizers can be made by either direct granulation methods (40%) or bulk blending (40%). Bulk blending is made by mechanical mixing of the separate granular intermediate materials. It is usually done in small plants near the point of use. This technique is employed because the fertilizer can be tailor-made to fit the exact requirements of the user. Fluid or liquid fertilizers (clear, suspension, and slurry) account for 20% of all NPK mixed fertilizers. 

Young, R. D., Providing Micronutrients in Bulk-Blended, Granular, Liquid and Suspension Fertilizer, Comm. Fert., 118(1), 21-24 (Jan. 1969). 

In Malaysia, this term includes anhydrous ammonia, ammoniating solutions, liquid mixed fertilizer solutions, suspensions, and slurries. The principal materials used in making liquid fertilizer are ammonia, ammonium nitrate, urea, phosphoric add, and potassium chlorideT... 

In the United States, the term liquid or fluid fertilizer is a general term usually including fertilizers wholly or partially in solution that can be handled as a liquid. This includes dear liquids, liquids containing solids in suspension, and usually anhydrous ammonia however, anhydrous ammonia sometimes is referred to as a gaseous fertilizer even though it is applied as a liquid. AAPFCO defines liquid fertilizer as a fluid in which the plant nutrients are in true solution. 

Fertilizers are packaged in a variety of different forms including solids, liquids (solutions and suspensions), and gas (anhydrous ammonia). The important physical properties of solid fertilizers are particle size, particle strength, caking tendency, chemical stability, and hygroscopicity. 

Gelatin scraps from pharmaceutical farm appear suitable to be used for the production of cast films or water suspensions for self-fertilizing mulching films or liquid mulches in blends with PVA and/or SCB. 

Three roasters operate in parallel to produce calcine. There are two 84-m fluidized bed roasters and a suspension roaster. Off-gas from the roasters is mixed with off-gas from the KIVCET furnace and is then processed in the sulphur gas handling area. By-products include calomel, sulphuric acid, liquid sulphur dioxide, and ammonium sulphate fertilizers. 

Suspension Fertilizer - A liquid (fluid) fertilizer containing solids held in suspension, for example, by the addition of a small amount of clay. The solids may be water-soluble in a saturated solution, or they may be insoluble, or both. 

Fluid fertilizers are usually divided into two distinct types solutions and suspensions. Solutions are defined as fluids, the ingredients of which are in solution. Solutions may be clear or of a particular color. Sometimes a coloring agent is added so that a particular liquid can be distinguished from another liquid. Sometimes color is imparted by soluble impurities. The important factor is that all ingredients are in solution and it is necessary that they remain in solution. A suspension is defined as... 

The term fluid fertilizers as used in this chapter refers to fertilizers such as anhydrous ammonia, aqua ammonia, nonpressure nitrogen solutions (28% to 32% N), liquid mixed fertilizer, and suspensions. Production of anhydrous ammonia, urea, and ammonium nitrate are presented in other chapters however, the use of these materials to produce fluids and their application will be discussed in this chapter. 

Substances reducing the autohesion of fertilizer particles may be used in the form of suspensions. After the evaporation of the liquid the powder is fixed firmly to the particles of fertilizer (see 26). Such an emulsion may be prepared from a concentrated solution of strongly hygroscopic salts or salt mixtures (for example, calcium and magnesium chlorides and nitrates) by adding nonionogenic SAS and gelatinous carriers such as Mg(OH)2, etc. 

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