A greenhouse experiment was conducted to test the potential of different soil amendments in saline-sodic soils
reclamation; to affect the growth response of alfalfa (Medicago sativa L.) plants grown on two saline-sodic soils; and to
evaluate the comparative efficiency of different soil amendments for their effects on salinity, sodicity, and pH levels of the
soils. To achieve these objectives, two highly saline-sodic soils were selected (Abees, Typic torrifluvents and Elhammam,
Typic calciorthids). Different soil amendments were used (compost, anthracite coal powder, water treatment residuals,
ferrous sulphate, and a combination of them). The results of the study indicated that pH of Elhammam soil was less
affected than pH of Abees soil after the amendment application because of the high calcium carbonate content which
acted as a buffer and resisted any appreciable change in soil pH in the alkaline range. The positive effects of all treatments
followed the order: T16 > T12 > T13 > T14 = T5 > T11 = T15 > T7 > T8 > T4 = T6 > T9 = T10 > T2 >T3> T1 >T0.
The most effective amendment in reducing SARe in the experimental soils was T16. This was due to the presence of Al
in WTRs and Fe in ferrous sulphate which enhanced the leaching process, and the presence of high adsorptive capacity
materials like WTRs and compost which adsorb more sodium. The positive effects of all treatments for reducing SARe
in Abees soil followed the order: T16 > T15 > T14 > T13 > T11 > T12 .While, in Elhammam soil, the order was: T16 >
T15 > T14 > T13 = T11>T12 = T5. The removal sodium efficiency (RSE) or percentage of Na-removed from the soils
at the end of the experiment was significantly reduced after the application of the amendments. RSE of T16 proved the
highest value (76%) among the treatments for the two soils used, followed by T15 and T14. The yield of biomass at T16
significantly increased, the increase being 959% in comparison with T0 in Abees soil, while the increase in biomass yield
was 1452% in comparison with T0 in Elhammam soil. However, field tests are necessary to draw the final conclusions.