It covers behavior in soil, chemical and physical characteristics, physiological role in plant growth and soil fertility, and more. This is the definitive, up-to-date reference on fertilizers. Gowariker began gathering knowledge for Fertilizer Encyclopedia. He has written several books and over research publications in the field of science and technology.
Gowariker works with an inter-disciplinary team of editors, including eminent chemists, plant pathologists, agriculturists, science writers, and management experts.
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Mixed fertilizers contain more than one of the three major nutrients—nitrogen, phosphorus, and potassium. Mixed fertilizers can be formulated in hundreds of ways.
On modern farms a variety of machines are used to apply synthetic fertilizer in solid, gaseous, or liquid form. One type distributes anhydrous ammonia , a liquid under pressure, which becomes a nitrogenous gas when freed from pressure as it enters the soil. A metering device operates valves to release the liquid from the tank.
Solid-fertilizer distributors have a wide hopper, with holes in the bottom; distribution is effected by various means, such as rollers, agitators, or endless chains traversing the hopper bottom.
Broadcast distributors have a tub-shaped hopper from which the material falls onto revolving disks that distribute it in a broad swath. See also manure. Article Media. Info Print Cite.
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Read More on This Topic. Start Your Free Trial Today. Learn More in these related Britannica articles:. Fertilizer grade is a conventional expression that indicates the percentage of plant nutrients in a fertilizer; thus, a 10—20—10 grade contains 10 percent nitrogen, 20 percent phosphoric oxide, and…. Fertilizer is an important component of dryland technology. For example, 20 pounds per acre 22 kilograms per hectare of nitrogen are recommended where rainfall is less than 13 inches millimetres , ranging up to 60 pounds per acre 67 kilograms per hectare where….