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Bioremediation of a Jordanian saline soil: a laboratory study

Al-Abed, N., Amayreh, J., Al-Afifi, A., Al-Hiyari, G.
Communications in soil science and plant analysis 2004 v.35 no.9-10 pp. 1457-1467
agricultural land, bacteria, bioremediation, catalysts, clay, confidence interval, electrical conductivity, field capacity, saline soils, silt, soil salinity, soil sampling, soil water, Jordan
Soil salinity is a major problem that threatens the productivity of agricultural lands, so there is a need to manage and remediate saline soils. Bioremediation of saline soil was studied at a laboratory scale. Saline soils from six different locations in Jordan were treated at the start of this study with a product called SLR-80, which is a blend of TRX-80 catalysts and aerobic bacteria. Three replicates of each soil sample were treated with SLR-80 at the start of the study. Soil moisture was kept at field capacity during the study as recommended. The treated soils had the following textural classification: clay, silt clay loam, sandy clay loam, and silt loam. The soil electrical conductivity was measured using three methods and they were the extract (EC(e)), the paste (EC(p)), and the centrifuge (EC(c)). There was no significant difference between the three methods used at 95% confidence interval. The EC(e) values at the start of this study ranged from 24 dS m(-1) for Amman Airport soil (clay) to 8.7 dS m(-1) for the Khaledieh soil samples (silt loam). The bacteria were very efficient in reducing the EC(e) values in the first week of application by almost 50% for all of the soil samples. After that the reduction of EC(e) was gradual and reached to almost 99.9% after 104 days for some samples.