ha = hectares. Is it correct to read it as 'HA'?

[fiddler]

No. I'm just showing you how it was written.
nvm

[GoesStation]

No. I'm just showing you how it was written.

There shouldn't be spaces around the slash. Nevertheless, any native speaker familiar with the "ha" abbreviation would always read that as "hectares per hour". I strongly suspect your speech sample was machine-generated.

[probus]

I have a feeling the excerpt comes from a text-to-voice system, as a human British English-speaker would know the abbreviation and be very unlikely to pronounce the letters individually.

Maybe, but if so such systems have recently made great progress in natural intonation. It never ocurred to me that it might not be a real person speaking.

[PeterCW]

The voice is definitely British. When you wrote "HA", I read it as the word "ha", not the initials. I have a feeling the excerpt comes from a text-to-voice system, as a human British English-speaker would know the abbreviation and be very unlikely to pronounce the letters individually.

The clip is too short to be sure but it does sound a little like synthesised speech to me. I would also expect that any human BrE speaker would read "ha" as hectares. not as "aitch a".

[fiddler]

Indeed, this short part sounds a bit artificial, but only because individual letters are read. Really. The rest of the recording is even too 'real'. :)