Advice on watering system for a 'new' leylandii hedge

My first post so apologies in advance for omissions/errors. 12 months ago we planted 50m of leylandii (1.5m apart) along an existing boundary to provide a year-round hedgerow. They have taken well.
We water regularly as the existing hedgerow competes for water and we've had little rain, but I would like some advice on what watering system to use.
Due to the trees being 1.5m apart I don't see how a soaker hose would work.
I considered making holes in a hosepipe, but as the run is 50 metres I would have a problem regulating even pressure along the pipe.
The best bet so far seems to be something similar to Karcher's rainwater system where I can puncture a hose at intervals and regulate the pressure, but in my experience, Karcher's quality has really dropped the last few years and I'm hesitant to buy from them again.
So can anyone recommend a reliable and reasonably priced option for watering 50m of young leylandii at 1.5m spaces please?
We water regularly as the existing hedgerow competes for water and we've had little rain, but I would like some advice on what watering system to use.
Due to the trees being 1.5m apart I don't see how a soaker hose would work.
I considered making holes in a hosepipe, but as the run is 50 metres I would have a problem regulating even pressure along the pipe.
The best bet so far seems to be something similar to Karcher's rainwater system where I can puncture a hose at intervals and regulate the pressure, but in my experience, Karcher's quality has really dropped the last few years and I'm hesitant to buy from them again.
So can anyone recommend a reliable and reasonably priced option for watering 50m of young leylandii at 1.5m spaces please?
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East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham