Polytunnel cultivation in Sri Lanka How to set up a Polytunnel Drip Irrigation System. පොලිටනල් එකට බින්දු ජල සම්පාදන පද්ධතියක් සවි කරන විදිය Drip irrigation is an improved new-generation irrigation method that can get more benefits from farming. Nowadays polytunnel farming protected agriculture most famous in Sri Lanka. In polytunnel farming, we can use Drip Irrigation System mainly for irrigation and fertilizer application. This video explains the main parts of the Drip Irrigation System, fertigation unit, and their Drip Irrigation System Cost in Sri Lanka.