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Old 10-31-2012, 10:34 AM
Skipster Skipster is offline
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Join Date: Dec 2010
Location: Billings, MT
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Originally Posted by Smallaxe View Post
That has been talked about a lot in recent years and what I find most interesting about the subject is that most plants require help from biologicals, in a symbiotic relationship,, in order to extract the P from the soil...

Since the quicker that relationship is formed, the better... I don't believe that using "starter fert" (with P) is a good idea in the long term...
Young plants are in need of AM Fungi at birth and the application of P causes a noticeable reduction in AM Fungal activity, so we're actually working against the natural life cycle of the plant...

Then of course there are those who believe that a P application actually enhances germination...

Yes, there are lots of interesting things to learn...
I'm not aware of any studies that show that symbiotic relationships are required for P uptake, but they can help.

That said, research has shown these beneficial microbes are ubiquitous in the environment and present in such high numbers naturally that there is very little that turf managers can do to impact these, negatively or positively.

In fact, when a study was conducted using 100% autoclaved sand as a growing medium and planted with autoclaved seed (so that no microbes could be introduced from the seed), there were just as many beneficial microbes one week after planting as there were on an undisturbed, untreated pasture (this was some of Dr. Zuberer's work we talked about months ago).

Adding P fert at seeding does not negatively or positively impact soil microbiology. But, it does help grasses establish better.
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