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[[Urea]] [[NPK rating|(46-0-0)]] accounts for more than fifty percent of the world’s nitrogenous fertilizers.<ref name="schwab">Schwab, G.J. and L.W. Murdock. Nitrogen Transformation Inhibitors and Controlled Release Urea. Extension Report. Lexington, KY: University of Kentucky College of Agriculture, 2005.</ref> It is found in granular or [[prill]] form, which allows urea to be easily stored, transported and applied in agricultural settings. It is also the cheapest form of granular nitrogen fertilizer. Since urea is not an oxidizer at standard temperature and pressure, it is safer to handle and less of a security risk than other common nitrogen fertilizers, such as [[ammonium nitrate]].


==Breakdown of urea==
For plants to absorb nitrogen from urea it must first be broken down:


<math>(NH_{2})_{2}CO + H_{2}O \stackrel{urease}{\rightarrow} NH_{3} + H_{2}NCOOH \rightarrow2NH_{3(gas)} + CO_{2(gas)}</math><ref name=Tisdale1985>{{Citation | last1 = Tisdale | first1 = Samuel L. | last2 = Nelson | first2 = Werner L. | last3 = Beaton | first3 = James D. | year = 1985 | title = Soil fertility and fertilizers | pages = 161–168 | isbn = 0-02-420830-2 | publisher = Macmillan | location = New York}}</ref>
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[[Urease]] is a naturally occurring enzyme that catalyzes the hydrolysis of urea to unstable [[carbamic acid]]. Rapid decomposition of carbamic acid occurs without enzyme catalysis to form ammonia and carbon dioxide.<ref name="Tisdale1985" /><ref>Benini, Stefano, Wojciech R. Rypniewski, Keith S. Wilson, Silvia Miletti, Stefano Ciurli, and Stefano Mangani.  1999. A new proposal for urease mechanism based on the crystal structures of the native and inhibited enzyme from Bacilus pasteurii: why urea hydrolysis costs two nickels.  Structure 7:205-216.</ref> The ammonia will likely escape to the atmosphere unless it reacts with water to form ammonium (NH<sub>4</sub><sup>+</sup>) according to the following reaction:
 
<math>NH_{3(gas)} + H_{2}O \rightarrow NH^{+}_{4} + OH^{-}</math>
 
This is important because [[ammonium]] is a plant available source of [[nitrogen]] while ammonia is not.<ref>Brady, Nyle C. and Ray R. Weil. The Nature and Properties of Soils. New York: Prentice Hall, 2001.</ref> Additionally, the formation of the [[hydroxide]] ion may cause soils around the applied urea particle to have a pH around 9.0 which increases ammonia volatilization. This area is also highly toxic due to elevated ammonia concentration for several hours so it is recommended that urea based fertilizers not be applied or banded with planted seed at a rate that exceeds 10–20&nbsp;kg/ha, depending on the crop species.<ref name=wells>Wells, K.L., L.W. Murdock and H.F. Miller. Urea as a Source of Fertilizer Nitrogen for Crops in Kentucky. Extension Report. Lexington, KY: University of Kentucky College of Agriculture, 1978.</ref> It is important that there is adequate moisture because up to thirty percent of the available nitrogen can be lost through atmospheric volatilization within seventy-two hours of application.<ref>McInnes, K.J., et al. "Field measurements of Ammonia Loss from Surface Applications of Urea Solution to Bare Soil." Agonomy Journal (1986): 192-196.</ref>
 
== Management considerations==
Ammonia volatilization reduces the economic efficiency of agricultural cropping systems.  Either yield will be reduced or additional costs will be incurred from additional nitrogen fertilizer. The amount of ammonia volatilization depends on several environmental factors, including temperature, pH, and the soil water content. Additionally, the amount of surface residue and time between urea application and precipitation are also critical. Generally speaking, volatilization will be lower when urea is applied during the wetter and cooler conditions that generally occur in early spring (March and April). However, drying surface soil and rising temperatures as spring progresses increases the probability of ammonia volatilization.<ref name="schwab"/> Ideally, a manager should attempt to apply nitrogen immediately before a moderate rain event (0.1 inch), allowing urea to dissolve and move into the soil. However, this is not always possible.  The soil’s pH also has a strong effect on the amount of volatilization. Specifically, highly alkaline soils (pH~8.2 or higher) have proven to increase urea hydrolysis. One study has shown complete hydrolysis of urea within two days of application on such soils. In acidic soils (pH 5.2) the urea took twice as long to hydrolyze.<ref>Christianson, C.B., et al. "Microsite Reactions of Urea-nBTPT Fertilizer on the Soil Surface." Soil Biology and Biochemistry (1993): 1107-1117.</ref> Surface residues, such as thatch and plant stubble exhibit increased urease activity.  Soils that have high organic matter content also tend to have higher urease concentrations. More urease results in greater hydrolysis of urea and ammonia volatilization, particularly if urea fails to move into the soil.<ref>Torello W.A. and Wehner D.J.. “Urease Activity in a Kentucky Bluegrass Turf.” Agronomy Journal (1983): 654-656.</ref>
 
==Urease inhibitors==
Fertilizer is often applied when field conditions are not optimal, particularly in large scale operations. Most studies,<ref name="schwab"/><ref>McCarty, G.W., J.M. Bremmer and H.S. Chai. "Effects of N-(n-butyl) thiophosphoric triamide on hydrolysis of urea by plant, microbial and soil urease." Biology and Fertility of Soils (1989): 123-127.</ref> indicate that nitrogen losses can be reduced in these situations when a urease inhibitor is applied to the fertilizer.
Urease inhibitors prevent the urease enzyme from breaking down the urea. This increases the probability that urea will be absorbed into the soil after a rain event rather than volatilized into the atmosphere. This causes subsequent hydrolyzation to occur below the soil surface and decreases atmospheric losses. The use of inhibitors also decreases the localized zones of high pH common with untreated urea.<ref>Watson, C.J., et al. "Rate and mode of application of the urease inhibitor N-(n-butyl) thiophosphoric triamide on ammonia volatilization from surface-applied urea." Soil Use and Management, British Society of Soil Science (2008): 1-7.</ref>
 
==References==
<references/>
 
[[Category:Nitrogen metabolism]]..
[[Category:Soil chemistry]]..

Revision as of 15:15, 25 February 2014


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