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Scots Pine grows in a wide range of soils but mainly well drianed and slightly sandy. I have some in clay soil and they are happy enough. I think it is root problems - possibly root rot but could be that the roots got damaged by a number of things. They prefer slightly acidic soil - who alkali is the soil? Also if it does die take it back to the shop you bought it as plants should not die in 4 weeks or so.
I wonder if it is sitting in a sump-did you dig over the area for it or just dig a planting hole?
Ph 10 is strongly alkali...you want it 7 which is neutral. Are you using spent mushroom compost? That has lime in it. Otherwise you sound like you are doing exactly what I would do re adding compost etc.