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The Decomposition of Urea in Soils

Published online by Cambridge University Press:  27 March 2009

T. Gibson
T. Gibson
Affiliation:
(Bacteriology Department, Edinburgh and East of Scotland College of Agriculture.)
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Extract

The decomposition of urea has been investigated in 59 soil samples of extremely varied character. Urea was decomposed readily in all and very rapidly in most of the samples.

In mountain and heath soils the decomposition was generally active, especially in soil tests. Strongly acid peat samples (pH. 3·1 to 3·3) decomposed from 0·44 to 0·86 per cent, of their own dry weights of urea in 24 hours at 22° to 23° C.

In solution and soil tests samples from permanent pastures produced a more rapid decomposition than those from cultivated land. In soil tests with pasture samples quantities of urea as large as 1 per cent, of the dry weight of soil were converted to ammonia in 24 hours at 22° to 23° C. Fertile arable soils produced a relatively slow decomposition in soil tests.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 20 , Issue 4 , October 1930 , pp. 550 - 559
Copyright
Copyright © Cambridge University Press 1930

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