The effect of microorganisms, organic residues and calcium salts on the formation of soil aggregates


  • Omer Ali Fattah College of Agriculture, University of Sulaimani, Kurdistan Region, Iraq. Author



Microorganisms, Soil aggregates


A set of laboratory experiments were conducted, the aim of which was to compare the effect of the interaction between different levels of poultry waste (0, 5, 1,3%) with the same levels of cow waste and different levels of calcium salts (0, 750, 1500) ppm Ca For each of the calcium nitrate, calcium carbonate and calcium chloride and their interactions on the formation of soil aggregates, which is represented by the weighted average diameter formed after two months of incubation in sterile and inoculated with types of different genera of fungi: Rhizopus nigricans, Penicillium chrysogenum, Asperigllus niger and the bacteria Rhizobium trifoli i , Bacillus subtilis, Azotobacter Chroococcum
The results showed that the inoculation of the soil with types of different species of fungi and bacteria led to different increases in the average weighted diameter compared to the uninoculated soil, and that the fungi are more effective than the bacteria, and also it was found that the type and level of addition of organic waste had an impact on the average diameter. The weighted of the aggregations and that it increases with the increase of the quantities added and that the effect of poultry waste was greater than the effect of the waste of cows, and the results showed that the type and level of addition of calcium salts had an effect on the average weighted diameter and that it increases with the increase of the quantities added and that the effect of calcium nitrate salt was more effective.


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How to Cite

The effect of microorganisms, organic residues and calcium salts on the formation of soil aggregates. (1997). Journal of Zankoy Sulaimani, 1(1), 129-140.