The salinity of soil has great effects on nutrients availability to plants or crops and on the ability of plant roots to absorb nutrients. Because of low productivity problems in the salt affected soils, fertilizers are applied to counteract the conditions which limit the plant absorption of nutrients. Thus the present work is aimed to understand the structural/molecular changes of solute (fertilizer) in solutions (saline salts) which results various solute-solvent, solvent-solvent and ion-solvent interactions in order find any way to control the salinity problem. These interactions depend on the nature of solvent, size and structure of ion. For this purpose Ammonium Sulfate (AS) is being used which contain the 10.6% of nitrogen. The numerous volumetric and acoustical properties depend upon the temperature, concentration and composition were calculated on the basis of measured experimental data of density and sound velocity of Ammonium Sulfate (AS) molecules and different saline salts. The effect of different volumetric and acoustical parameters with change in concentration and temperature were studied and the results were explored in terms of solute-solvent, solvent-solvent interactions and structure making or breaking effects are of great importance in understanding the extent and nature of solutions.

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The acoustic (obtained thorough ultrasonic [NDT] characterization), thermodynamic, and volumetric parameters help to forecast and understand the behavior of intermolecular interactions, strength, or weakness as well as the ilk of the liquid mixture. In this paper, an attempt is carried out to understand the structural or molecular alterations of fertilizer in saline soil salts which results from several solute-solvent, solvent-solvent, and ion-solvent interactions present in the systems to find a way to control the problem of salinity of the soil. Because of the above facts, the ultrasonic velocity (U) and density (𝝆) measurements studies on fertilizer name as ammonium sulfate having the number of concentrations varying from 0.02 to 0.2 mol kg −1 in water also in 0.5 mol kg −1 aqueous soil salt solution at different temperatures. The various acoustical, thermo-dynamical, and volumetric parameters that can be calculated are adiabatic compressibility (𝜷), acoustic impedance (Z), intermolecular free length (L f ), specific heat ratio (𝜸), non-linear parameter (B/A), isothermal compressibility (k T ), Pseudo-Grüneisen parameter (𝚪), and internal pressure (𝝅 i ). Hence, the present study exposes the structural sense of the experimental liquid mixture and results have been described in the light of intermolecular interaction existing in between the fertilizer-water-saline salt solutions.

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