Helpful tips Mark.
On longevity in soil, I reckon it depends on the amount/concentration in manure.
Paul seems to have relatively little and I suspect it is mostly gone now.
The advice to rotovate (aargh) is just taken from the lexicon of misunderstandings about soil, and what do Dow know or care?
Rotovating kills a lot of microbes.
Whereas compost (old manure in this case) encourages microbes, worms etc to feed at the surface, as is their habit. Breakdown of ap should then be quicker than if it were incorporated.
