[BigRedGun]

Okay okay okay I think I am definitely over thinking this! So per 1000sq’ cool season lawn am I mixing 4oz Citric Acid , 2oz Ferrous Sulfate, 1.7oz Ammonium Sulfate or am I reading the ratios wrong ?? My lawn is also sitting at around 7.4 pH from two summers ago!

I did a bit of experimenting for pH levels from my high pH water. I used an equation from Grok to help me after I knew the pH of the base solution. I added 1 oz of CA to my mix and I think I’m in the ballpark now.
I always spray Urea at the same time as my FAS, so I first mixed up my Urea into my full sprayer amount. For me it is 15 gallons. Got that mixed first and filled about 2.5 gallons of that mixture into a 5 gallon bucket. Then mixed my Fe and AMS with the AMS going into it the bucket first. Then dumped it into the sprayer to mix.
Ended up with this color:

Without CA it looked like this:

We have rain on deck tomorrow afternoon too. I think your 4 oz per 1000 is way too high. My Urea solution was about 6.8. I used 1 oz for 15 gallons for 15k sq ft.

 

[ChaseC123]

I did a bit of experimenting for pH levels from my high pH water. I used an equation from Grok to help me after I knew the pH of the base solution. I added 1 oz of CA to my mix and I think I’m in the ballpark now.
I always spray Urea at the same time as my FAS, so I first mixed up my Urea into my full sprayer amount. For me it is 15 gallons. Got that mixed first and filled about 2.5 gallons of that mixture into a 5 gallon bucket. Then mixed my Fe and AMS with the AMS going into it the bucket first. Then dumped it into the sprayer to mix.
Ended up with this color:
View attachment 67374

Without CA it looked like this:
View attachment 67375

We have rain on deck tomorrow afternoon too. I think your 4 oz per 1000 is way too high. My Urea solution was about 6.8. I used 1 oz for 15 gallons for 15k sq ft.

using ai, that’s awesome. Color looks good too, post your results with a control patch!

 

[Jonslawn]

I did a bit of experimenting for pH levels from my high pH water. I used an equation from Grok to help me after I knew the pH of the base solution. I added 1 oz of CA to my mix and I think I’m in the ballpark now.
I always spray Urea at the same time as my FAS, so I first mixed up my Urea into my full sprayer amount. For me it is 15 gallons. Got that mixed first and filled about 2.5 gallons of that mixture into a 5 gallon bucket. Then mixed my Fe and AMS with the AMS going into it the bucket first. Then dumped it into the sprayer to mix.
Ended up with this color:
View attachment 67374

Without CA it looked like this:
View attachment 67375

We have rain on deck tomorrow afternoon too. I think your 4 oz per 1000 is way too high. My Urea solution was about 6.8. I used 1 oz for 15 gallons for 15k sq ft.

Were you applying UREA at a spoon feed rate then add both Ferrous Sulphate and Ammonium Sulphate for the FAS portion?

 

[PAndaemonium]

Also why both urea and AS? I was gonna take FS and use urea to improve iron uptake.

 

[PAndaemonium]

Okay okay okay I think I am definitely over thinking this! So per 1000sq’ cool season lawn am I mixing 4oz Citric Acid , 2oz Ferrous Sulfate, 1.7oz Ammonium Sulfate or am I reading the ratios wrong ?? My lawn is also sitting at around 7.4 pH from two summers ago!

Also why both urea and AS? I was gonna take FS and use urea to improve iron uptake. I also have hard water but my pH is pretty neutral

 

[BigRedGun]

Were you applying UREA at a spoon feed rate then add both Ferrous Sulphate and Ammonium Sulphate for the FAS portion?

Correct.

 

[tkuhl]

Yes, it works great for cool season grasses. I use 3oz ferrous sulfate and 2.5 oz ammonium sulfate per thousand for KBG. Don't go much higher that that, it will burn the grass. Don't ask me how I know.

Do you think it burned the grass from too much Ferrous Sulfate or too much AMS? I was thinking of spraying .2 lbs/N/1k of AMS with 2 oz of Ferrous Sulphate and .1 lbs of Sulphate of Potash for my biweekly foliar fert application. I'd prefer to spray the iron in one go vs spraying it separately due to my higher nitrogen rate. The nitrogen rate suggested above (1.7 oz of AMS) would only be .02 lbs/N/1k of AMS, which seems like a tiny amount.

 

[Lust4Lawn]

The nitrogen rate suggested above (1.7 oz of AMS) would only be .02 lbs/N/1k of AMS, which seems like a tiny amount.

It's not supposed to supply significant N. It's for uptake of the iron primarily.

 

[tkuhl]

It's not supposed to supply significant N. It's for uptake of the iron primarily.

Thank you, and I understand it's purely meant for Iron uptake, but I was trying to consolidate my foliar applications into one application vs 2 applications (one FAMS and one as my main source of Nitrogen, AMS). I think if I combined, I'd burn my lawn from other discussions I've read.

 

[Lust4Lawn]

Thank you, and I understand it's purely meant for Iron uptake, but I was trying to consolidate my foliar applications into one application vs 2 applications (one FAMS and one as my main source of Nitrogen, AMS). I think if I combined, I'd burn my lawn from other discussions I've read.

I've combined spraying Urea/DEF at .1 lbs of N per 1000 with the FAS solution including the AMS and had no issues. But that is just me.

 

[TheZMan]

Do you think it burned the grass from too much Ferrous Sulfate or too much AMS? I was thinking of spraying .2 lbs/N/1k of AMS with 2 oz of Ferrous Sulphate and .1 lbs of Sulphate of Potash for my biweekly foliar fert application. I'd prefer to spray the iron in one go vs spraying it separately due to my higher nitrogen rate. The nitrogen rate suggested above (1.7 oz of AMS) would only be .02 lbs/N/1k of AMS, which seems like a tiny amount.

Hello, I am back after a couple year break…. Sold previous home and am back at it. Did a full front lawn Reno last fall and got great results with SuperTurf2 seed.

I’m amazed at how far this thread has come since it started, and I even remember my experiences with mixing FAS a few years ago. I think for me the biggest issue was concrete staining and paranoia about this iron getting on anything. As a result, I will most likely switch to Main Event to minimize staining.


With all that being said, I picked up some LawnStar liquid iron this year as it had great reviews. The rate said 4-8oz per 1,000 sq feet.

I would like to confirm my current mix I used 2 weeks ago.

4K sq feet: 4 gallons water, 4lb AMS, 24 oz LawnStar liquid iron. So that gives you 0.21 lb N per 1k. No CA used.

My lawn ignited deep deep deep green. I’m just figuring the cost of a liquid iron versus main event at the moment. I just wanted to confirm that you can make your iron part of a spoon feed formula.

 

[tkuhl]

Hello, I am back after a couple year break…. Sold previous home and am back at it. Did a full front lawn Reno last fall and got great results with SuperTurf2 seed.

I’m amazed at how far this thread has come since it started, and I even remember my experiences with mixing FAS a few years ago. I think for me the biggest issue was concrete staining and paranoia about this iron getting on anything. As a result, I will most likely switch to Main Event to minimize staining.


With all that being said, I picked up some LawnStar liquid iron this year as it had great reviews. The rate said 4-8oz per 1,000 sq feet.

I would like to confirm my current mix I used 2 weeks ago.

4K sq feet: 4 gallons water, 4lb AMS, 24 oz LawnStar liquid iron. So that gives you 0.21 lb N per 1k. No CA used.

My lawn ignited deep deep deep green. I’m just figuring the cost of a liquid iron versus main event at the moment. I just wanted to confirm that you can make your iron part of a spoon feed formula.

I appreciate the context. I might spray a small area first and then follow-up with the whole yard to make sure I don't have any burning at that rate. However, do you have cool season turf or warm season? I live in Indiana and mostly have KBG and PRG. Maybe bermuda or other warm season turf species can tolerate the higher salt index better than my cool season lawn. Also, I have ferrous sulphate heptahydrate instead of liquid or chelated iron for my iron source.

 

[TheZMan]

I appreciate the context. I might spray a small area first and then follow-up with the whole yard to make sure I don't have any burning at that rate. However, do you have cool season turf or warm season? I live in Indiana and mostly have KBG and PRG. Maybe bermuda or other warm season turf species can tolerate the higher salt index better than my cool season lawn. Also, I have ferrous sulphate heptahydrate instead of liquid or chelated iron for my iron source.

I have cool season turf in CT. We haven’t hit the super high temperatures at all yet this year (expected end of this week). Grass mix is super turf 2 so mostly RTF and I believe 10% KBG.

FAS worked for me a few years ago. Mostly to sum it up - make sure you get that water pH in that 5-6 range before adding the iron. I remember my first mixes turned orange above 6. The color was nice at 5.5.

 

[tkuhl]

I have cool season turf in CT. We haven’t hit the super high temperatures at all yet this year (expected end of this week). Grass mix is super turf 2 so mostly RTF and I believe 10% KBG.

FAS worked for me a few years ago. Mostly to sum it up - make sure you get that water pH in that 5-6 range before adding the iron. I remember my first mixes turned orange above 6. The color was nice at 5.5.

Sounds good, thanks. I have very hard water and will be adding enough Citric Acid to lower my PH as well for proper Iron uptake. I also read the acidity could burn my lawn, but I guess I'll never know until I try it. We'll see how it goes later this week after I spray.

 

[PAndaemonium]

Still struggling to get the color dialed. Ran soft water and CA down to 5ish and still got some precipitate. Could be that I didn’t dissolve enough. Maybe hot water would be better. Yellowish green. Better than the hard water

 

[440mag]

… still got some precipitate. …

Does your sprayer have a plastic basket with “mesh“ -type holes?

I ask as my Chapin does AND WHAT I DO IS LAY a piece of CHEESECLOTH inside the basket and that REALLY prevents anything from getting inside my tank that might possibly hinder or clog my pump or any fittings / nozels.

i get the stuff they refer to as “nut milk bags” that they use to make almond milk etc when the fabric bags go on sale on amazon, etc.

i put a magic marker mark on one side that tells me, “this side up” and I simply spray it clean in between tank fills.

IT IS AMAZING WHAT THAT FABRIC CATCHES!

Amazon.com : nut milk bags for straining reusable

 

[PAndaemonium]

Does your sprayer have a plastic basket with “mesh“ -type holes?

I ask as my Chapin does AND WHAT I DO IS LAY a piece of CHEESECLOTH inside the basket and that REALLY prevents anything from getting inside my tank that might possibly hinder or clog my pump or any fittings / nozels.

i get the stuff they refer to as “nut milk bags” that they use to make almond milk etc when the fabric bags go on sale on amazon, etc.

i put a magic marker mark on one side that tells me, “this side up” and I simply spray it clean in between tank fills.

IT IS AMAZING WHAT THAT FABRIC CATCHES!

Amazon.com : nut milk bags for straining reusable

yea i do strain the precipitate and looks like the color is about right. Still playing with dosing. Nothing major compared to control with 2.5oz, will go up to 3 on kbg/tttf. Or I’m just wasting my time and have reached max uptake

 

[MikeConroy]

Has anyone attempted this tank mix using EDDHA? I cant imagine that ferrous sulfate wouldn't either oxidize in the tank or within minutes of it hitting your lawn.

 

[Grizzzman]

Has anyone attempted this tank mix using EDDHA? I cant imagine that ferrous sulfate wouldn't either oxidize in the tank or within minutes of it hitting your lawn.

I have done it at a rate of 8 Tbsp per 1K. It mixed and sprayed just fine. Be very mindful of where you aim and mix/cleanup.

 

[brykit64]

Please note that for FAS you are looking for Ferrous Sulfate Heptahydrate, not Ferrous Sulfate Monohydrate which is not easily water soluble.

It looks like Ferrous Sulfate Heptahydrate is regulated