English Language Learners Stack Exchange is a question and answer site for speakers of other languages learning English. It only takes a minute to sign up.
Sign up to join this community
The only area where progress is lagging is the provision of high-efficiency irrigation systems to growers, mostly owing to technical factors such as the unavailability of clean water to prevent clogging.
What is the purpose of comma which is after "growers".
If you leave it out, then the reader may think the clause "mostly owing ..." applies to the growers.
Of course, that phrase applies to "progress is lagging", and explains why progress is lagging.
