THE ROLE OF CARBONATES AND ORGANIC MATTER IN CRACK DEVELOPMENT AND PATTERN OF SOIL SEPARATES

K. Abbas, M.

	THE ROLE OF CARBONATES AND ORGANIC MATTER IN CRACK DEVELOPMENT AND PATTERN OF SOIL SEPARATES
The Iraqi Journal of Agricultural Science
Article 1, Volume 43, Issue 0, 2013, Pages 73-79
Author
M. K. Abbas
Abstract
The object of this study is to show the role of carbonate and organic matter in producing and developing of cracks in the three sized soil separates (Clay, Silt and sand). The soil's constitutes were separated and put in to petridishes, in equal volume of 1:10 suspension. Then treated chemically and left to desiccate in laboratory. The parted areas, the crust thickness, the shape and pattern of cracks were measured and described. The results of clay separates showed an increase in the number of parted area significantly at 0.05 probabilities. The sand separates showed an increase in crust thickness. In case of silt separates it showed the longest diameter and least parted areas over both sand and clay. The geometric shapes of most parted areas were varies. Clay distinguished by sharp geometric and elongated shape. Meanwhile, the silt showed irregular shape with curved boundaries, the sand showed absence of any geometric shape. When Carbonate removed from soil separates the clay particles separates increased. Silt and sand were insignificantly affected. Crust thickness of clay was thin when carbonate and organic matter removed when compared with silt and sand. Silt separates had longer diameters of the separates in all treatments. Geometrical forms of clays were clear and surfaces of weakness were different in all treatments. Silts geometric forms were varied from regular to rhombus and different surfaces of weakness in all treatments, and that was the same with sand separate.

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