Most chemical reactions have been carried out in molecular solvents previously. For two millennia, most of our understanding of chemistry has been based upon the behavior of molecules in the solution phase in molecular solvents. Room temperature ionic liquids (RTILs) are salts with melting points lower than 30 o C. They look like inter-ideograph; TEXT-ALIGN: justify; MARGIN: 0cm 0cm 0pt" In second section of this study we were considered the effect of three compounds on growth of greenhouse cucumbers. Two of these compounds are chloride.2ZnCl 2 and zinc-methionine and one of them is chloride.2urea. In consideration of zinc-source, zinc (Zn) was supplied with chloride.2ZnCl 2 or zinc-methionine or zinc sulfate and for surveying the nitrogen-source, nitrogen (N) was supplied with chloride.2urea or nitrate ammonium. The plant harvested in one steps, 49 days after seed germination and in this step fresh weight of shoots and roots were determined. In Zn-treatment`s plants the Zn concentration in shoots and roots were measured. the result indicated that chloride.2ZnCl 2 and zinc-methionine have good effect on growth of greenhouse cucumbers and Zn concentration in shoots and roots. Urea is an importent nitrogen fertilizer in today ` s agriculture and its suitability for field crops has been well evaluated. In N-treatment we were considered the effect of nickel (Ni) on hydrolysis urea so we used Ni at 0.1 ?M level. Ni increased hydrolysis urea and decreased urea concentration in plant.