Re: RE: Fertilizer - preemergents

Looks like it would be good for iris.   This site sells it as a fertilizer,
and the preemergent qualities would be desirable.   This is interesting to me,
I might be interested in trying it.    So now the question is, has anybody
used this on Iris?
Kitty

http://www.groworganic.com/a/item_F750_CornGlutenMealFertilizer65Lb.html

"Corn gluten meal is a source of 9-10% Nitrogen which is purely derived from
vegetable protein. Caution must be used when applying this product, as it has
germination inhibiting effects on seeds. After applying corn gluten, allow 1-4
months, depending on soil conditions and weather, before direct seeding into
that ground. If soil temperatures and biological activity are low, the
allelopathic effects can last up to 6 months. There is no danger in using this
fertilizer on established plantings. Corn gluten is especially good for lawns
and tends to be fast acting. Apply at 20-40 lb/1000 sq ft or 1500-2500
lb/acre."

> >But I couldn't find anything which would
> >indicate that corn by-products would inhibit growth of other plants
>
> It is my understanding that corn gluten meal (not regular old corn meal)
> with at least 60% protein content is commonly used as an organic
> pre-emergent herbicide.  It is also my understanding that it is the high
> protein that produces the herbicidal activity, so CGM with less than 60%
> protein is not effective.
>
> Laurie

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