The Effect of Irrigation Water Salinity Frequency in the Electrical Conductivity and Aggregate Stability of Sandy Loam Soil Treated with Different Levels of Organic Residual


Afield experiment was conducted in Bergessea region, which is located in Zubair district Basra governorate. The soil texture was Sandy Loam. The aims of the experiment is to study the effect of the irrigation water salinity frequency during the growing stages of sorghum crop (Sorghum bicolor L.), different levels of organic residual levels 0(O1), 25(O2), 50(O3), 75(O4) and 100(O5) tonha-1 and soil depths (0-30) cm (d1) and (30-60) cm (d2) on electrical conductivity(EC), aggregate stability(MWD) of the soil. The water salinity includes two levels, fresh water of EC 0.7 dsm-1 (FF) and high salinity well water of EC of 12 dsm-1 (FFSS). FF was used during plant emergency and plant branches stage (up to the middle of the season) whereas FFSS was during flowering and seed stage (mid of the season to the end). The organic fertilizer factor includes five. The statistical design used was R.C.B.D, with three replicates. After three months the plants were harvested. The results showed that the treatment FFSS recorded the highest values of EC and MWD. The values are 8.695 dsm-1and 1.082 mm respectively. The EC and MWD values increased with increasing the organic residual levels. Level O5 of organic residual recorded the highest values of EC, MWD whereas; level O1 recorded the lowest values of EC, MWD. The three other levels O2, O3, O4 gave medium values for the three parameters. Soil depth d1 supervised depth d2 in giving lower value of EC, higher value of MWD.