@sketty55 Any effects of the iron are likely gone 3 weeks after application. You can get a color pop that usually lasts 2 weeks or so after application. Increase the rate to the max label rate and see if you get the response you're looking for.

 

Thanks, I should have been more clear in my post, there was no visible difference at all during the three week period after applying. My understanding is that I should see results 48hrs after application.

 

I will let someone chime in or correct me, but I think FAS is very susceptible to pH. May want to do a soil test or water test.

 

Also I learned a few weeks ago what order you mix may matter? If your ph is to high it may activate the iron from the fs when mixed in your sprayer first? So doing the as first helps lower it? Someone else would need to confirm

 

When you mix what colour does it turn? This is very basic but if it turns orange,that generally means your water Ph is too alkaline (high). You would need to buffer it with something like citric acid. The mixture should be a blue green. Again this is very basic. I'm not a chemist.

 

@sketty55 I didn't even ask but I assume you left the spray on the leaf blade for 6 hours before rain or irrigation?

 

@sketty55 I didn't even ask but I assume you left the spray on the leaf blade for 6 hours before rain or irrigation?

Yes, i left the the spray on the leaf for 12 hours, before it rained heavily. The mixture was blueish before applying. Appreciate all of your advice.

 

How much carrier (water) did you use?

 

Pictures?
Maybe it's as dark as your going go get with the type of grass u have

 

i started out at 2oz/k and never noticed any difference. Ive upped mine to 5.5oz/k of FS and the results have been much better.

i dont know if if id be as concerned about it turning orange (both effective and ineffective tank mixes have turned orange for me) but also, as others have said i would adjust your mixing sequence and check the pH of your water before adding the FS.

 

Hi all. I applied FAS for the first time on my lawn approximately three weeks ago. Unfortunately, my lawn looks no different than before, and it looks the same as my neighbors who does not apply FAS. I apply to 1000sq ft total at the following rate:

2oz FS
1.7oz AS
.18oz PGR
.12lb Urea

Any idea what the issue could be? I ordered all products last fall and stored them all in my basement.

Appreciate any advice!

i started out at 2oz/k and never noticed any difference. Ive upped mine to 5.5oz/k of FS and the results have been much better.

i dont know if if id be as concerned about it turning orange (both effective and ineffective tank mixes have turned orange for me) but also, as others have said i would adjust your mixing sequence and check the pH of your water before adding the FS.

Thanks so much, I will give this a try and report back on results.

 

If your soil ph is low enough you may be getting sufficient Iron from the soil as well.

 

Sometimes stuff just doesn't work for whatever reason. I don't think you did anything wrong. Now you know not to spend your money on that product anymore.

 

FAS only works for me if the grass is actively growing. If you applied it on yellow/stressed grass it isn't going to do much of anything

 

I noticed much more "pop" when I started mixing in 0.25 oz per gallon carrier water of Citric Acid powder. It is probably more than I need, but it is cheap and easy to measure 1 oz per 4 gal backpack sprayer.

 

i use 4 oz OF FS per 1M

 

stupid question but what is fas?

 

Ferrous Ammonium Sulfate.

 

For foliar applications, chelated iron is better than salts of iron. Iron HEDTA or iron sucrate would be examples of chelated iron.

Anyway, your soil might already have enough iron.

 

For foliar applications, chelated iron is better than salts of iron. Iron HEDTA or iron dictate would be examples of chelated iron.

Anyway, your soil might already have enough iron.

This is not match the study Kreuser did.

 

Can you share the other studies? More so, ones that show that foliar chelated is better than foliar ferrous sulphate hepta?

 

OP: the only other observation I would make is that mixing iron sulfate and ammonium sulfate in a jug with tap water isn't quite the same as starting with ferrous ammonium sulfate, which--while those two things are indeed ingredients--is prepared with another reagent as well as with heat, and the recrystallized.

(I'm assuming--based on your opening post--that "FS" means ferric sulfate or ferrous sulfate, and "AS" ammonium sulfate).


Also--and this, generally speaking, I am more sure of--the presence of the other stuff in your tank mix could definitely interfere with any aspect of the uptake and/or observed effect you were looking for. I'm not saying I'm sure it did, but I'm sure it could, and so that's something to think about.

I would humbly suggest--if you want to try this again--to focus on two things. First, if possible, try to find a product containing FAS. Second (not sure if you already did this anyway), after spraying, let the material dry and stay there for a bit of time.

 

@sheepfescue, this thread is over 3 years old. The original OP has not posted anything nor replied to any thread since 2020. This thread was resurrected by someone that wanted to know what FAS meant.