By A.G. Norman (Ed.)
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Extra info for Advances in Agronomy, Vol. 17
Although nonpressure solutions usually are surface-applied, solutions containing free ammonia must be injected into the soil to depths of 2 inches or more; otherwise serious volatilization losses occur. In the west- ADVANCES IN FERTILIZERS 25 ern irrigated areas, nitrogen solutions are applied extensively in irrigation water by the flood and furrow methods. Nonpressure solutions also can be added to water applied by sprinkler systems; however, the practice is not widespread. Application methods are described by Adams et al.
The major drawback of ammonium sulfate is its low analysis and the acid reaction that it produces in soils. Its sulfur content is a definite asset on sulfur-deficient soils, and it mixes well with practically all other fertilizer materials except those of high alkalinity. Ammonium sulfate is well adapted to dry-mix formulations and bulk blends because of its low hygroscopicity. 3. Urea Urea, NHaCONH2, containing 45 or 46 per cent N, is the most concentrated commercially available solid nitrogen carrier.
It is frequently used as a source of some of the phosphorus in solid mixed fertilizers and often is included along with nitric acid in the manufacture of nitrophosphates. Phosphoric acid can be injected into the soil or into irrigation water, but these uses are not widespread. Consumption of phosphoric acid in fertilizer manufacture undoubtedly will continue to increase in response to the world trend toward higher analysis fertilizers. Also, its high phosphorus content in comparison to that of phosphate rock assures that it will be an increasingly important item of commerce.
Advances in Agronomy, Vol. 17 by A.G. Norman (Ed.)