To try and bring the PH of your soil down, you could try shredded
plenty of it, it tends to make the soil acid.
The other material you could use is peat, it is acid too.
Have you been over-using the lime ?
that could account for the soil being too base.
Has your soil been inundated with sea water ?
let us know what happened to make the PH rise to over 8.
Try introducing worms, they are capable of bringing the soil back to
neutral (PH 7),
that is their main job in nature.
and they are still happy at a PH of 8.5 or thereabouts
--Sincerely Yours :
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