Dear Mr. Bashir In pakistan ...

Dear Mr. Bashir In pakistan extensive reserach has been undertaken to control salinity and to reclaim salt affected soils. Many Projects have been carried out. So I assume that there is a wealth of knowledge and experience available in Pakistan to solve these problems.(WAPDA for instance) The essence is as other commenters have mentioned: Leaching of the soil with water and installing and a drainage system to evacuate the salinsed drainage effluent out of the area. The left bank outfall drain has been specifically constructed to evacuate the drainage effluent towards the sea. Chemicals (gypsum) can be a help (but no solution) to combat the possible alkalinity of the soil. There is unfortunately no easy and cheap solution to control salinityt in an large area. If you do it lfield wise you will send the salinity toward the neighbours, not a vary cheelfull solution either.