Salt index is used as a measure of burn potential. The salt index of AS is ~325. Urea is ~160 so you need to be more careful when spraying AS. In my experience, at 0.21 lbs N/1000 of AS, you have mild to moderate risk of burning so I almost always keep my dose to 0.15 lbs N or less per application.
- I do not spray AS when temps are high. I also spray in the evening.
- I would recommend that you keep the amounts lower to avoid problems your first several sprays.
- I would water it in the next morning regardless of amount.
- I would consider increasing your carrier volume to 2 gal/1000 with AS.
- If you do want to spray higher rates, consider washing the AS off the leaves within 30 minutes of application using a short (~10 mintue) irrigation cycle. If you accidentally overapply, definitely wash it off to prevent burning.

 

Or just apply granular.

 

Awesome, thanks for the recommendations! It was my maiden voyage this morning so I went out with 0.5lb AMS per gallon. I'm very lucky to have an irrigation system that is on the heavier side, so burning and delivery of water don't concern me.

11,300 Sq feet, applied 11.3 pounds AMS in approx 24 gallons of water.

It was my first time doing this but I'm hooked now that I dialed in the Kobalt 4 gallon sprayer with those TEE Jet nozzles

Reason for spray is that I like knowing I'm really in control. I don't trust my Scott's spreader and I haven't stepped up to a better spreader yet. It's next on my list.

Had brand new irrigation in the fall which can deliver beyond expectations.

Last, my pH was 7.4 last fall and now 7.7 this spring. Being in CT, can't quite figure out why my pH does this. I will continue to monitor and assess the situation.

I am really excited to do the foliar application of Iron with AMS very soon!!!!

 

@TheZMan Have you tested your water ph? It could be like mine where my water ph is around 8 so anytime I water I'm not helping my situation of lowering the soil ph.

 

@TheZMan Have you tested your water ph? It could be like mine where my water ph is around 8 so anytime I water I'm not helping my situation of lowering the soil ph.

Bad news.... it's really 9.5. Confirmed with town report and ph meter myself

 

@TheZMan Have you tested your water ph? It could be like mine where my water ph is around 8 so anytime I water I'm not helping my situation of lowering the soil ph.

what is the pH of your rain?

 

@TheZMan Have you tested your water ph? It could be like mine where my water ph is around 8 so anytime I water I'm not helping my situation of lowering the soil ph.

what is the pH of your rain?

No idea but it looks like maybe around 6 after some google research.

 

@TheZMan Have you tested your water ph? It could be like mine where my water ph is around 8 so anytime I water I'm not helping my situation of lowering the soil ph.

Bad news.... it's really 9.5. Confirmed with town report and ph meter myself

Welcome to the club.

 

One of the reasons your soil pH will fluctuate is because of the salt content in the soil. Your pH will be lower in the fall after adding salts (fertilizer) the whole season and higher in spring after winter when there is less salt content in the soil. Some labs will test pH using a salt solution instead of testing pH in water to replicate the pH of your soil after it has been fertilized and help produce more consistent results. Here is an article about it if you want to read more:

https://extension.uga.edu/publications/detail.html?number=C875&title=Soil%20Testing:%20Soil%20pH%20and%20Salt%20Concentration