View Full Version : If using CGM/synthetic?
03-20-2004, 08:29 AM
If I were using corn gluten meal along with a synthetic fertilizer what would be good numbers for the synthetic fertilizer. thanks.
03-20-2004, 09:46 PM
By the time you apply enough corn gluten meal for pre emerge control, you have already applied too much N!!!!!!!!!!
So what sythetic fert are you wanting to apply?
How much n,p,k do you need per year?
03-21-2004, 08:20 PM
Why would that be Tim? Isn't CGM an organic that releases it's nitrogen and other nutrients over time. With CGM your feeding the soil (microherd) which in turn breaks down the organics (over time) into inorganics N,P,K and micronutrients. Now, the inorganic nutrients are readily available for the grass to utulize. The breakdown of these organics is determined by other factors also, i.e. water, heat, decomposers in the soil, like worms beetles ect.. CGM isn't going to release it's nitrogen all at once right? CGM is expensive to apply on large lawns, it may also inhibit seed from germinating just like a halts or other preemergent. If your going to use CGm as a fertilizer try and go totally organic if you can. But there are many factors that go along with your question.
03-21-2004, 08:23 PM
I forgot if you do use CGM as a fertilizer use #20 per 1000sq' by all means don't dump #100 on a small area.
03-21-2004, 11:56 PM
20 lbs./1000 sf . . . and CGM is considered 10-0-0 . . . that's 2 lbs of N/1000 sf.
That's a helluva lotta N to be applying in one app, even if it releases slowly.
Any idea of an effective rate for CGM just as a pre-em?
03-22-2004, 08:59 PM
cgm isn't that great as a pre emerge, unless turf has very little crab or goose pressure and turf is dense!
Never used cgm, but most organic fertilizers last some where between 4 to 12 weeks when soil temp is high enough for microbes to be active, higher application rate will give a little longer release. cgm contains only nitrogen, usually 10-0-0, and applying 20 lbs = 2lbs/m of nitrogen, way too much for spring and summer feeding. Rember, in cool season turf, 2/3 of yearly nitrogen should be applied to release in fall!
to better answer your question, you would need a sythetic fert low in N, maybe a touch of p, and alot of sulfate of potash! but how much cgm are you going to apply?
03-22-2004, 11:45 PM
so . . .
if using CGM as a spring pre-m, you've flooded the lawn with too much N in the spring - and no P or K.
For a fall pre-m app CGM may be too slow to release to the turf any good over wintering . . . and again no P or K.
And it's not a particularly effective pre-m anyway . . .
Anyone with experience with CGM over a 3 yr period as has been stated to get acceptable pre-m control?
03-24-2004, 01:15 PM
CGM goes down as a dust which makes it very available to the microbes simply because of the enormous surface area of dust. Also, CGM is more than a dense source of protein, it also is a carbohydrate source. The carbs encourage the microbes to multiply which speeds up the protein digestion and ends up dosing all of the protein from the CGM nearly all at once. As a fertilzier it should be used well under 15 pounds per 1,000. I would start at 10p/m and see if you should adjust downward.
03-24-2004, 09:22 PM
So, if you are going to use cgm as pre emerge for crab and goose grass on cool season turf, how do you get enough down (20 lbs/m), since it also is a fertilizer, and should be used well under 15lbs/m?
03-26-2004, 09:08 PM
And at what rate for a Scotts spreader do you recommend?
03-27-2004, 06:52 AM
scotts, lesco, agri-fab, spyker pull behind spreaders
100% OPEN............. period
push walking spreaders 5/8 open
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