NOT EASY ANSWER Hello your ...

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NOT EASY ANSWER

Hello your question need a complete evaluation of real problem, with only a picture is dificult to can decide the best way,

most important is that to clean a soil and maintenance is needed a group of tecniques. 

I think you can find information in the page of USDA, visit www.ars.usda.gov/main/main.htm and check for salinity soils, you can read interesting information.

regards from Spain