Compound Fertilizers

Fertilizers, Compound


fertilizers containing two or all three of the three basic plant nutrients—N, P2Os, and K2O—as well as microelements, such as B, Mn, Cu, Zn, and Mo.

Compound fertilizers are generally highly concentrated (containing boosted amounts of nutrients and little filler), so that they require less expenditure of labor and capital than do simple fertilizers for application, storage, and hauling. Compound fertilizers have good physical properties; they do not cake and they scatter well when applied by machine. The nutrient ratios of compound fertilizers vary, depending on the method of production, the initial components, and the requirements of the plants fertilized.

Compound fertilizers have been used extensively since 1950, especially in the United States, Canada, England, the Netherlands, Japan, France, and Italy, where they constitute more than 50 percent of all fertilizer produced. In the USSR, plans for 1971–75 called for an increase in the share of highly concentrated and complex fertilizers to 80 percent of all fertilizer production.

Compound fertilizers are classified as either two-element (phosphorus-potassium, nitrogen-phosphorus, and nitrogen-potassium) or three-element (nitrogen-phosphorus-potassium). Depending on the method of production, they are considered complex, complex-mixed, or mixed. Compound fertilizers are used for all crops, whereas complex fertilizers are used primarily for industrial crops, such as cotton and sugar beets.

Complex fertilizers are obtained through the chemical interaction of the initial components—ammonia, phosphoric acid, nitric acid, phosphorites, apatites, and natural potassium salts. They are produced in granulated form. The most common types of complex fertilizers in the USSR are Ammofos (nutrient content, 56–64 percent), Diammofos (71–74 percent), Nitrofos (38 percent), potassium nitrate (57 percent), Nitroammofoska (50–54 percent), and Nitrofoska (36 percent). The possibilities are promising for complex liquid fertilizers, potassium metaphosphate, and ammonium polyphosphate.

Complex-mixed fertilizers are produced by mixing finished fertilizers and treating them with sulfuric acid, nitric acid, and ammonia or ammoniate. The nutrient content in these fertilizers reaches 58 percent, depending on the initial components. Complex-mixed fertilizers for sugar beets are produced in the USSR that contain 4, 16, and 8 percent and 3, 12, and 6 percent nitrogen, phosphorus, and potassium. There are also more concentrated fertilizers, with as much as 45 percent nutrient content.

Mixed fertilizers are produced by machine mixing finished fertilizers (primarily superphosphate with nitrogen fertilizers and potassium chloride). Mixing rules are observed in order to avoid nutrient loss. For example, ammonium nitrate and other ammonia fertilizers cannot be mixed with thermophosphates, ash, or other alkaline fertilizers, since this causes a loss of nitrogen; and ammonium nitrate cannot be mixed with urea because of the very high hygroscopicity of the mixture obtained. Neutralizing supplements, such as lime, dolomite, and cement dust are added to improve the physical properties of the mixtures. The best mixed fertilizers are obtained when granulated components are mixed. The nutrient ratio to be used in mixed fertilizers depends on crop requirements and soil characteristics. For example, a 1 : 1 : 1 ratio of nitrogen, phosphorus, and potassium (that is, N, P2O5, and K2O) is the basic fertilizer for grain crops, sugar beets, potatoes, and vegetables on soddy podzols, gray forests, and chernozems, and a 1 : 1.5 : 1 ratio is applied at planting time for grains, vegetables, and industrial crops.


Spravochnaia knigapo khimizatsii sel’skogo khoziaistva. Edited by V. M. Borisov. Moscow, 1969.


References in periodicals archive ?
the leading Polish chemical group and Europes second largest manufacturer of mineral fertilizers and third largest producer of compound fertilizers.
Expansion projects are also planned at a completely exporting manufacturing unit of compound fertilizers in Gabes (60 MTD), a rebar manufacturing plant in Ben Arous (40 MTD) and a manufacturing unit of animal feed in Sfax (10.
Product coverage: Nitrogen Compounds, Phosphate, Potash and Compound Fertilizers.
produces and distributes humic acid-based compound fertilizers through its subsidiaries in China.
Exports of compound fertilizers rose by 160% y-o-y to $144m (revenue per tonne increased by 10%).
Fatima Fertilizer and Pakarab Fertilizer have the technology to produce the necessary range of compound fertilizers with an overall manufacturing capacity is 2.
During the first nine months of this year, the company has produced 15,200 tons of compound fertilizers, of which 8,685 tons have been marketed to the State Company for Agricultural Supplies," according to a ministry statement received by Aswat al-Iraq news agency.
In fact, most imported ternary compound fertilizers are applied in these high-end cash crops.
Supply of compound fertilizers, and various foliar fertilizer and lime in quantities and range indicated in the tender documents.
Under a three year agreement, Sino-agri will sell 150,000 metric tons of compound fertilizers produced by Gufeng (Gufeng Fertilizers) in calendar year 2015, 300,000-metric-ton Gufeng Fertilizers in 2016 and 500,000-metric-ton Gufeng Fertilizers in 2017 to promote Gufeng's flagship products.
Sales of phosphate and compound fertilizers increased by 9% y-o-y to 1.