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Old 04-09-2008, 05:47 PM   #1
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question on fertilization rates


Alright, I've run into an issue with fertilization rates.


Let's say that a product recommends 1lbs of nitro / 1,000 sq ft for grass, but it also recommends 1.5lbs nitro/1,000sq ft for trees/shrubs/garden beds.

I have a large tree whose canopy covers ~75% of my backyard, and I can't help but think that I should be applying more fertilizer, as I have the grass and the tree, but I'm afraid of burning.

What would you guys do? Double the fertilizer all at once? Do the double application, but divide it so it's not hitting the grass all at once? Just confused, seems that if the huge tree's roots are there, it'll need more than if it were just for grass, yet something about doubling (or even adding 50%) to a 1lbs nitro/1,000 sq ft application feels reeeaaallly risky to me!!

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Old 04-09-2008, 10:12 PM   #2
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question on fertilization rates


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Originally Posted by joeyboy View Post
Let's say that a product recommends 1lbs of nitro / 1,000 sq ft for grass, but it also recommends 1.5lbs nitro/1,000sq ft for trees/shrubs/garden beds.


so why not just go 1lb per 1000 to be safe? seems like a no brainer to me.....

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Old 04-09-2008, 10:12 PM   #3
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question on fertilization rates


If the fertilizer manufacturer says to put down 1.5 lbs nitrogen per 1000 sq. ft. with a tree on your lawn, then you should be safe but it also should give some information on how much depending on height of tree so that you could adjust the above amount.
Actually for just a lawn only, its recommended to put down no more then 4 lbs of nitrogen per 1000 sq ft per season. You would normally do this in four applications spread evenly throughtout the growing season. Now this is nitrogen only I am talking about as I suspect the fertilizer you want to use is a blended fertilizer with phosphate and potash added. Is that correct? if not then apply it as directed by the manufacturer into four separate applications of 1.5 lbs of nitrogen each.
But if you are using a blended fertilizer, then you would need to use much more blended fertilizer to get 1.5 lbs of nitrogen per application. The formula I use to determine this is just for lawns that only require 4 lbs of nitrogen per 1000 sq ft per season and If I were you, I would consult with a professional because of the tree. You also can go to the mfg of the blended fertilizer and consult with them. There is also a forum called All About Lawns that I use that may help more if you do not get the answer you need about the tree.
Go to www.allaboutlawns.com/forum/index.php

Last edited by rjordan392; 04-09-2008 at 10:17 PM.
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Old 04-09-2008, 11:42 PM   #4
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question on fertilization rates


I suggest that you use the recommended application rate for the grass and use tree spikes to fertilize the tree properly. This would solve your problem. The tree would not be sapping the grass of its nutrients.
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Old 04-10-2008, 11:55 AM   #5
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question on fertilization rates


good stuff!! Thanks guys!
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Old 05-05-2008, 11:03 AM   #6
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question on fertilization rates


Not all fertilizers burn, it depends on the make up of the fertilizer. When fertilizing trees, we actually take a power drill, drill 8 or so holes in the ground around the dripline, 12 inches deep, and fill these holes with a slow release nitrogen source. Otherwise, I'd just fertilize your lawn at the 1 lb rate, and maybe toss a little bit more around the tree a couple weeks later.
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Old 05-05-2008, 04:47 PM   #7
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Not all fertilizers burn, it depends on the make up of the fertilizer. When fertilizing trees, we actually take a power drill, drill 8 or so holes in the ground around the dripline, 12 inches deep, and fill these holes with a slow release nitrogen source. Otherwise, I'd just fertilize your lawn at the 1 lb rate, and maybe toss a little bit more around the tree a couple weeks later.
Robert actually hit the key thing to do when fertilizing a tree. The fertilizer should be placed at the "dripline". This is where the tree takes-in it nutrients.

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