Ask a Question forum: phosphorus

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Name: tk
murchison texas (Zone 8a)

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Jan 3, 2015 4:26 PM CST
My soil has way too much phosphorus, which prevents plants from absorbing other nutrients. Anyone know if with this soil condition, the plant also is prevented from absorbing............phosphorus?
Cauliflower is just a cabbage with a college education (mark twain)
Name: Rick Corey
Everett WA 98204 (Zone 8a)
Sunset Zone 5. Koppen Csb. Eco 2f
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Jan 6, 2015 7:35 PM CST
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.

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"

Name: greene
Savannah, GA (Sunset 28) (Zone 8b)
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Jan 6, 2015 9:37 PM CST
Some of the answers may be here:
The thread "when to fertilize" in Ask a Question forum
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~"Leaf of Faith"
Name: tk
murchison texas (Zone 8a)

Tomato Heads Avid Green Pages Reviewer
Jan 6, 2015 9:44 PM CST
I seem to have a habit of writing an answer, and not hitting finish. Thus losing the message. Anyway, thank you both. Ill check out the links, and advice.
Cauliflower is just a cabbage with a college education (mark twain)

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