Three different calcareous rocks consist mainly of calcite C, dolomite D and its combination C,D were chosen. Rocks Samples Were treated with different concentration of salt Soluations, included CaCl₂ (0.2,0.05 molar) (applied to dolomite samples), MgCl₂ (applied to calcite samples), and combination of these two salts which applied for both (D-Dolomite and C-Calcite). Other samples from carbonate minerals were treated and incubated with FeSO₄.7H₂O and Fe-EDDHA at 20Mg^-1 mineral. These treated samples subjected to sequence of wetting and drying for 120 days under saturated CO₂ atmosphere. At the end of incubation period these samples were air dried and used

A field experiment was conducted at Abu-Ghrib during 2013- 2014 season to study the effect of harrowing systems on the decomposition and fermentation on organic matter(OM) when added and mixed with the soil under special technology, as well as its effect on the growth parameters and productivity of (Zea mays L. 5018). The experiment was laid out using factorial randomized complete block design (RCBD) in split-split design with three replications in SCL bare soil with a percent of moisture ranged from 16 – 18 %. The main plots were designated to the two systems of harrowing (Rotary Harrowand Disc Harrow ). The sub main plots were specified for two organic matters ( Sheep manure ,cow manure ) . Data were statistically analyzed, and