الفهرس 
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Abstract
This study was carried out in the Soil Science Departement of the faculty of agriculture, minia university to
examine the relstionship between nh3 volatilization from amide-n and convention _ N fertilizets added to six soils collected from different soils from minia governorate
the studied soils were treated with n-compounds (amides and nh4no3 and
(nh4)2S04 at one rate of application (200 uC/g soil) •
1. In all the studied soils it was observed that the most of nh3-N lost by volatilization occurred during the first day of incubation for the amide-N compounds, ammonium nitrate
and ammonium sulphate; however, NH3 volatilization
However, succinamide acheived the highest amount of nh3-N evolved when added to 8hosha soil, and the recorded value was 24.27 %.
While, the lowest loss of nh3-N as a percentage was recorded from benzamide when it was added to Candel soil and the recordedvalue was 10.22%
2. Formamide, acetamide, and benzamide seems to be the most resistant compounds to hydrolysis in the first week of incubation
3. There is a good relationship between the rate of nh3-N volatilized and the numbor of carbon atoms of amides added to shosha ,nasla hossen ,west samaloute ,and candel soil.
4. The percentage of nh3-N evolved seems to increase proGreessively by increasing the number of carbon atoms of amide compounds up to 4.
5. The recorded mean value of % N lost as nh3-N from foramide (1 carbon atom) was 14.04 %, and from succinumide
(4 carbon atoms) was 18.72 %.
6. The amount s of nh3-N volatilized from ammonium nitrate, ammonium sulphate, and the amide-compounds in all the
investicated soils were correlnted positively with calcium carbonte content.
There was a negative relation between orGanic matter
content, clay content and cec of the soils used and nh3-n volatilized from nh4no3, (nh4)2S04; and amide-compounds.