Advantage and disadvantage of replacing Persian wheel of irrigation with tube well
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-More efficient / faster / does not need to rest
-For larger area / more water / goes deeper
-Regular supply / can be used at any time of year / continuous -Less labour required
-Cleaner water
-Reduces waterlogging and salinity
Disadvantages of tube well
-Expensive / cannot be used by poor farmers
-Reduces groundwater / lowers water table
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