The Study of Corn Cobs and Gypsum AddingIn Some Physical Characters and Organic Matterof Cracking Soils from Middle of Iraq

Abstract


 
 
 
 In order to investigate the role corn cobs and gypsum in some physical charactersand organic matter ofclayey cracks and their properties. Seven soils sites (Afak, Al-Diwaniyah, Al-Taleea, Babel, Agriculture college, Al-Wahda and Al-Raid project)
 There are three types of treatments as follows:
 - Corn cobs was applied in four levels (0 . 10 . 20 and 40) g.kg-1
 - Gypsum (calcium sulfate) applied in four levels (0 , 5 , 7.5 and 10) g.kg-1.
 - Treatments of interaction between corn cobs and gypsum.
 Corn cobs , gypsum and their interaction were applied in same levels above.
 
 
 
 
 In this experiment , 2 kg of each studied soil were treated with same levels of corn cobs and gypsum above and incubated at 30 + 2 °C for 90 days and 80% relative moisture content at 33 kpa. The results were summarized as :Soil aggregate stability (MWD) and organic matter values were increased , while modules of rupture and (COLE) values were decreased , with increasing of gypsum and corn cobs applying. Also, results showed that the decreasing of (COLE) values were depending on the clay content and interaction treatments , between corn cobs and gypsum. The decreasing of (COLE) values were the highest in the clayey cracks disappeared treatments.