Dear Yousef,

for increasing yielding of potato, you should use the high yielding variety, free of disease i.e disease resistant variety, sufficient and proper dose of organic manure, maintain the proper soil health system i.e to manage the soil physical and biological properties. If you are the first time to potato farming, you should consult an expert farmer. you should have profound knowledge of serious potato disease known as late blight or potato blight. (Early blight, caused by Alternaria solani, is also often called "potato blight".) Even you need to be careful for insect pests of potato to protect

There are huge works on potato over the world, You may have consult with  :

Now I think you may have a direction to get some experiences on potato farming.

Wish you all the best.

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Probably a good satart is some validated model on climates that can be assimilated to your target. for an example as in http://www.tandfonline.com/doi/pdf/10.1080/01140671.2004.9514285 or control odl literatures from Wageningen as the ones from Herman van Keulen (-2013), and p40 of a general report would give the actual limits in North europe. http://www.wrr.nl/fileadmin/nl/publicaties/DVD_WRR_publicaties_1972-2004/W062_Input_and_output_coefficients_fo_various_cropping.pdf

Dear Members,

Thanks for your answers.

All in all i need to the all of used mechanisms in your countries for increasing the potato yield. 

Regards