Apr. 5 , 1924 
Studies with Cyanamid 
45 
The ammonia and nitrate production from cyanamid, particularly nitrate, was 
dependent upon the rate of application. With the smallest applications nitri¬ 
fication was complete within 19 days while with the largest amount, namely, 
104.4 mgm. N per 250 gm. of soil, nitrification was only about 50 per cent com¬ 
plete in 200 days. In such cases the cyanamid nitrogen remained in the soil 
largely in the form of cyanamid, dicyanodiamid, and ammonia. In the case of 
the small applications of cyanamid more than a 100 per cent recovery of the 
70 
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SOM AP/LOA/S. 
/3 MGS. A/ AS CyAAtAM/0. 
26 MGS. A/ AS CYAA/AAf/0. 
32 MGS. /V AS OYAA/AAf//?. 
/04MG&. A/ AS CYAA/AAf/0. 
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mmmmm mmmm mm hm 
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— 
and oiled cyanamid 
added nitrogen was obtained in some instances. This^may have been due to a 
stimulating action which small quantities of cyanamid may possibly have had 
upon the nitrifying organisms, causing a more rapid nitrification of the organic 
soil nitrogen than takes place in the soil containing no cyanamid. However, no 
great significance should be attached to this since, as previously stated, the re¬ 
duction method is not very accurate for the determination of very small amounts 
of nitrates. In these experiments 200 gm. of soil were extracted with 500 ce. of 
