Al-Qadisiyah Journal For Agriculture Sciences

Ten soils are chosen from different geographic sites from Iraq :Abu
Ghraib(Three soils) ,Al-Jadriya ,Dyala (Tow soils) , AL-Sulaimaniya,Al-Kut
,Al-Nasriya , Al-Dewniya they differ in their chemical and physical properties ,
to determine Kinetic values (activation energy and temperature coefficient ) of
amidase enzyme in soils . The ten soils are incubated at 10-60 C° of incubation
temperatures ,and amidase activity is determined at each degree to calculate
kinetic values temperature coefficient (Q10) and activation energy (Ea) in soils
.Results have shown that the increasing of temperature cause increasing
hydrolysis of formamide (Amidase activity ) ,and the results have shown Q10
values of soils are between 1.83-2.37 ,where as Ea values are between 59.17-
86.61 K Jol.mol-1 .

The experiment is conducted during Winter season 2009-2010 in the Research
Station of College of Agriculture Al-Muthana University. Cadmium as a heavy
metals is applied at the rates ( 0 , 3 , and 6 mg/kg soil ) as CdCl2 , while organic
matter ( O M ) mixture are have been added at mixing rate of ( sand , 1sand : 1 )
O M ) and 1 sand : 2 ( O M ) as cow dung ) . The experiment is laid out in CRD
with 3 replicates in 27 pots . Data have been collected on plant height ,stem
diameter ,shoot wt , shoot DM , root length and root shoot ratio .The addition of
Cd has a significant deleterious effect on all the properties except root/shoot
ratio , while the O M has a significant effect on plant height and Root length
only . There is a significant interaction between some properties