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Old 10-31-2012, 12:37 PM
Smallaxe Smallaxe is offline
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Join Date: May 2007
Location: Central Wisconsin
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Originally Posted by Skipster View Post
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.
See, this would be an interesting discussion in more detail for a number of reasons...

There is the available P and there is the tightly bound P that exists in almost every soil/rock in the world(to my knowledge)...
Yes, P does help plants establish and is not to be disregarded at all... P is a very important nutrient which is what makes it one of the big 3... We are just considering the source and how much is needed for grass...

In regards to AM Fungi arriving in a couple of weeks,,, I've heard/read that AM Fungi can frequently find the host that it is matched to within a season or 2...

For grass to mine the P, that is bound up in the soils, it must have the aid of AM Fungi, becuz w/out the fungi, the plants will be restricted to the freely available P...
Is that True?

The other point that I'd heard/read was that when P was added to the soils,,, that the AM Fungi became rather inactive, while so much available P was present... I did not read of a reason 'why', that would happen, just that it did happen...
Is that True??
Now that I know that clay's texture(platelets) has nothing to do with water infiltration, percolation, or drainage
,,, I wonder what does...
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