All I could find was that excessive P in the soil can interfere with uptake of "required micronutrients, particularly iron and zinc".
Nothing about excessive soil P causing P uptake problems. Maybe sick, injured and dieing plants have many problems, some of which might impede taking up any nutrients, P included (that's just my speculation).
It's been said that excessive P favors weeds and non-mycorrhizal plants over most desirable crops. If the presence of plentiful P in the soil discourages plants from encouraging arbuscular mycorrhiza, MAYBE there are some circumstances where the lack of AM fungi slow down uptake of some nutrients ... but that even more speculative and unsupported.
You can foliar-spray iron and zinc to get them into the plant despite the soil problem. This article suggests spraying leaves with 1/2% to 1% iron+zinc solution, (maybe one to four times each month). You could make up a concentrate that has 10% iron and 10% zinc, then dilute that ten-fold or 20-fold.
https://aggieturf.tamu.edu/fil...
Several articles pointed out that adding excessive compost - especially manure - can put excessive P into soils. That was the first time I read about "
too much manure, except for concern about salinization.
This rather technical article mostly talks about how to
avoid creating excessive P levels in soil. The only suggestion they had for removing the excess was to plant two batches of cover crops every year and don't plow them back under!
"Mitigating High-Phosphorus Soils"
http://www.cals.uidaho.edu/edc...
