Help!! I put down the wrong bag of fertizizer!

[m0i0k0e]

I went to home depot and thought I was buying 3 bags of Lesco Pre-Emergent fertilizer, but I accidentally picked up a brand name called All-American. It is Lawn and Garden Fertilizer 5-10-5 for lawns, vegetables and shrubs. The bag is the same color as the Lesco, and was mixed in with the Lesco! Anyway, I put it down with a Scott's "EdgeGuard" spreader at the setting of 6. It was a 40 lbs bag.

The question is, what do I do now that it's on my lawn? Do I put the Lesco Pre-Emergent down which is 19-0-7 or do I have to wait until a certain amount of time has passed? The problem is, I put that bag on one side of my lawn and the correct Lesco stuff on the other side!! I know, I should have looked more closely. :(

All American - Fertilizer (All ready on lawn):
5% Nitrogen
10% Phosphate
5% Potash

Lesco Pre-Emergent(want to add to the lawn):
19% Nitrogen
0% Phosphate
7% Potash

If I add it now I would have a total of:

24% Nitrogen
10% Phosphate
12% Potash

Can I do it?

This is a bad way to start of the season....

Thanks for your help in advance.

[JWTurfguy]

You're probably fine. There's not enough Nitrogen in what you put down for you to need to worry about burning the grass. I'm not sure how heavy setting 6 is on your spreader, though. If you're worried about it, just go to your local LESCO store and buy a bag of Dimension 0-0-7 or Pre-M 0-0-7. That way you can apply the preemergent without fert and you're completely safe, although I don't think you have that much to worry about anyways.

[m0i0k0e]

Thats' what I was hoping, but I figured I atleast ask the question!
i'm going to puit down the Lesco.

Thanks for the quick reply JWTurfguy!

[Dixie Rob]

Home Depot sells Lesco products? That's a new one for me....

[PaulJ]

YOu can reduce the rate slightly and put the lesco on right over the other stuff. to get the smae total of N but the 5% isn't going to make a big difference.

[spoolinaround]

Home Depot sells Lesco products? That's a new one for me....
on some things they are cheaper too

[m0i0k0e]

Yea, I noticed they started selling Lesco products last fall here in Maryland.

[blaze347]

I posted a long explanation of the following, but it didn't post????
You actually will only be putting down a "mixture" of 12-5-6. Remember those numbers reflect the % of a certain ingredient based upon the total weight of the bag

[NattyLawn]

If he's putting down 12-5-6 but at what rate? At 10 lbs per K? You don't know how much he was putting down at 5-10-5, and now he's coming on top with 19-0-7. I would buy the Dimension, wait until late April, then apply it. I think you could do more damage then good right now. Dimension can be applied later than other pre-ems. How big is your lawn? Did you put all 3 bags of All-American down?

[blaze347]

Natty, you are correct about the watching the rate,my figures are based on weight and ingredients only. If he took both bags and dumped them together, then set his spreader at x, he is only putting down 12-5-6 per xft2. My point was not to worry about how "hot" the fertilzer was.
I agree with Paul and JW,I don't think he should worry about the "hotness" of the "mix",you can usually put down a much "hotter" fertilizer and not worry.(depending on the rate of course)

[lilmarvin4064]

actually thats not entirely correct. The 5-10-5 is a 40 lb bag. If he mixed the two bags it would be 13-4-6 (rounded). To be more exact 12.8-4.4-6.1.

(5*4 + 19*5)/9 = N

(10*4)/9 = P

(5*4 + 7*5)/9 = K

AI = (0.86% *5)/9 = 0.47%

Your figures would work if they were both 50# bags (1:1 ratio).

[blaze347]

OK-
Both are 40lb bags..correct?
5-10-5 would equate to the following:
5% of 40, 10% of 40, 5% of 40..if you agree with this, then the following is true:
2lbs,4lbs,2lbs of these ingredients.

19-0-7 would equate to the following:
19% of 40, 0% of 40, 7% of 40..which would be:
7.6lbs,0lbs, 2.8lbs.

Add the lbs,which would be:9.6lbs,4lbs,4.8lbs. in an 80lb "mixture"
9.6 of 80=.12, 4 of 80=.05, 4.8 of 80=.06...which equals:
12-5-6

My point was not to correct the math , but to show him not to worry that he put down that much N:usflag:

[Absolute Weed C]

Hes Fine from my stand point,,, I am using 28-8-8 in spring here and works wonderful,,, I get mine to green faster than true greens,,, and they dont turn into hay fields. I am getting a lot of customers from true green and nitro green because they can actually mow their grass now instead of using haying equipment,,,,,,,,,,,,,,,,,,,,,,,,More Snow Forcasted For Sunday Here:cry: :cry:

[lilmarvin4064]

OK-
Both are 40lb bags..correct?
5-10-5 would equate to the following:
5% of 40, 10% of 40, 5% of 40..if you agree with this, then the following is true:
2lbs,4lbs,2lbs of these ingredients.

19-0-7 would equate to the following:
19% of 40, 0% of 40, 7% of 40..which would be:
7.6lbs,0lbs, 2.8lbs.

Add the lbs,which would be:9.6lbs,4lbs,4.8lbs. in an 80lb "mixture"
9.6 of 80=.12, 4 of 80=.05, 4.8 of 80=.06...which equals:
12-5-6

My point was not to correct the math , but to show him not to worry that he put down that much N:usflag:

ok, I understand your math. I was under the impression that the 19-0-7 was a 50 lb bag. That's why I was correcting your calculations. I really don't mean to nit pick but, just trying to educate. Yes, I am known for making my own custom blends so I haVe done this many times.

Say you wanted to make a 1:0:1 fertilizer with the following requirements; 60% PScU (39-0-0), 30% Urea (46-0-0), and 10% ammonium sulfate (21-0-0) for the N, then 40% PScSOP (0-0-39), and 60% potassium sulfate (0-0-50) for the K, what would the final analysis be and how many lbs of each ingredient would I need to make 100 lbs? I doubt more than 3 regulars on this forum know how to do this.

To answer the original question......
sounds like you're probably putting down about 4 lbs/1000 sq ft at that setting, at least with the 19-0-7. If the pellets from the 5-10-5 are the same size as the 19-0-7 then they should be coming out the spreader at the same rate.

So lets assume, that from the the 5-10-5 @ 4#/M, you're getting .05*4 = .2 # of N / M. At the same setting/rate, with the 19-0-7 it will give you .19*4 = .76 # of N/M for a total of .96 # or about a lb. of N per 1000. It's a little high for the spring but unlikely to cause any burn. You're o.k. :drinkup:

P.s. i'll bet that is pendimethalin in that 19-0-7. realize that this is only half of the amount of pre-em you need for the season. Do it again in 7 weeks.

[blaze347]

Good question, I don't really know. My best guess without taking the next 2 hours "studying" the problem would be:
23.4lbs,13.8lbs and 2.10 lbs for the N and 23.4lbs and 30lbs for the K. I would be curious as to the correct answer and the math.:hammerhead: