Effect of CaCO<sub>3</sub> Form on Soil Inherent Quality Properties of Calcareous Soils
2020; Trans Tech Publications; Volume: 1002; Linguagem: Inglês
10.4028/www.scientific.net/msf.1002.459
ISSN1662-9760
AutoresMustafa Ismail Umer, Shayma Mohammad Rajab, Hajeen Khalil Ismail,
Tópico(s)Clay minerals and soil interactions
ResumoFour soil samples different in there CaCO 3 forms contents (total, active and active /total CaCO 3 ) were taken from tillage horizon 0-30 cm depth to study the impacts of CaCO 3 form on some soil inherent quality indicators in calcareous soils. Result revealed that the total CaCO 3 forms have a great influence on particle size distribution to make it coarser in general comparing with the absence of CaCO 3 with soil particles. The increase of active /total (A/T CaCO 3 %) till 50% has a positive effect on increasing soil electrical conductivity E.C ds.m-1, while increment of A/T CaCO 3 over 50% till 70% detrimentally reduced soil E.C ds.m-1 hundred fold. The elevation of (A/T CaCO 3 %) has inverse correlation with soil cation exchange capacity (CEC Cmole.kg soil). the elevation of (A/T CaCO 3 %) has inverse correlation with soil cation exchange capacity (CEC Cmole.kg soil) the (A/T CaCO 3 %) ratio over 56% till 69% significantly improves the mean weight diameter and macro aggregate. In general the optimum total CaCO 3 for micro aggregate formation may not exceed 20%. The best Total and (A/T CaCO 3 %) for better aggregate stability is between 20 to 48% . The proper total calcium carbonate for better total heterotrophic aerobic bacterial activity is around 20% . The best growth of the Azotobacter species which is belonging to non-symbiotic nitrogen fixing bacteria is obtained when total CaCO 3 ranges between 10-20% or between 48-56% of (A/T CaCO 3 %).
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