The relationship between soil constituents and crust strength of calcareous soils in Iraq
1987
Salih, R.O. | Maulood, A.O. | Salih, A.M. | Jack, F.J. (Scientific Research Council, Baghdad (Iraq). Agriculture and Water Resources Research Centre, P.O. Box 2416)
THe influence of soil constituents on crust strength was investigated using twenty one calcareous soil samples from different locations in Iraq. Soil crust strength measured by modulus of rupture tended to decrease with increasing sand, organic matter and exchangeable calcium and increase with increasing silt, clay and soluble and exchangeable sodium. The results also revealed that in a group of soils with 40-50% clay, total soluble salts, sodium adsorption ratio, exchangeable sodium and calcium and cation exchange capacity had strong correlations with modulus of rupture. Whereas in other soils with 21-39% clay, sand, silt, total soluble salts, exchangeable sodium and adsorption ratio had strong correlations with modulus of rupture. Multiple regression analysis showed that cation exchange capacity, electrical conductivity and soluble sodium were most important factors in determining crust strength. The results also showed that modulus of rupture did not correlate with lime content in the soils
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