الصفات الحركية لتحرر الحديد في بعض الترب الكلسية

الملخص EN

Laboratory experiment was carried out in order to study the release of Fe of chelated FeEDDHA and its kinetic properties at three incubation temperatures (i.e., 10, 25, and 35ºC) for 10 incubation periods (1 to 90 day) in six calcareous soils from middle of Iraq.

Randomized complete block design was used with three replicates.The results showed that iron release was significantly increased as the incubation temperature increased from 10 to 35ºC for all incubation periods but it was gradually decreased significantly as increased the incubation period from 1 up to 90 day period.

Iron release percentages for all temperatures and soils used were 68, 63, 54 and 37% for 1, 10, 30 and 90 day, respectively.

The first order equation was the best for prediction and describing the iron release with highest r2 value (0.975**) and t value (15.20).

The activation energy was vary in the study soils whereas the lowest was 12.58 recorded in Al-Rashidaa soil while the highest value was 15.68 KJmol-1 obtained in Balad soil.

Release rate constants of iron were significantly correlated with some soil properties (i.e., total and active carbonate, and plant available Fe).