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Old 03-04-2014, 04:29 PM
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Toro 44 Toro 44 is offline
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Spraying SOP? (Riggle, Green Doctor, any others)

I normally apply K in granular form as SOP. But I'm looking for a good sprayable K source.

There are 3 criterion I'm using:

1) Solubility

2) Salt index

3) Price

I thought that SOP was my answer. Other than potassium Carbonate, it has the lowest salt index and is affordable. But I have concerns about solubility. I may be spraying 1/2 pound of N in the form of stabilized urea. I'd like to add 1/4-1/2 pound of K with it.

My typical spray volume is between 1.5 and 2 gallons per 1,000 square feet.

I like potassium carbonate, but it seems very hard to get and pricey.

I've heard Green Doctor talk about potassium nitrate, but it is a little more expensive, has a higher salt index, and according to "Turfgrass Science and Culture" can deflocculate the soil when used over time. BTW my soils have a good deal of clay and tend to be acidic.

Does anyone have experience dissolving and spraying SOP (Riggle)? How much do you apply and what spray volumes were you using (2.6 g/m)? Seems like for a given amount of SOP, I will need at least 10 times that weight of water to disolve it. According to the solubility chart on wikipedia, Potassium Nitrate has about twice the solubility as SOP at the temps I'd be mixing in.

Thanks in advance!

P.S. It's not uncommon for my soil tests to come back needing sulfer. The sulfate in SOP is helpful this way
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Old 03-04-2014, 09:31 PM
ArTurf ArTurf is offline
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I think I've read where Ric has used disolved SOP but he applies at 5 gallons per 1000.
Why are you starting to apply in liquid form vs granular, just wondering?
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Old 03-04-2014, 10:21 PM
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Toro 44 Toro 44 is offline
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Quote:
Originally Posted by ArTurf View Post
I think I've read where Ric has used disolved SOP but he applies at 5 gallons per 1000.
Why are you starting to apply in liquid form vs granular, just wondering?
I'm doing it because most of my properties are small and a ride on is not practical. So instead of walking all my properties twice to spray and spread, tank mixing makes a lot of sense.

Plus luquid apps give me more flexibility in what i apply.

Thanks for your reply by the way.
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Old 03-04-2014, 10:42 PM
ReddensLawnCare ReddensLawnCare is online now
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Can someone please define SOP for me. Please excuse my ignorance on the matter
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Old 03-04-2014, 10:51 PM
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Toro 44 Toro 44 is offline
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Sulfate of Potassium aka Potassium Sulfate.

Hey AR,

I saw in a 2011 thread on liquid fert that you told green doctor that you found an affordable source for soluble SOP. Did you ever try spraying it?
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Old 03-04-2014, 10:51 PM
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Toro 44 Toro 44 is offline
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double post. sorry
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Old 03-04-2014, 10:53 PM
ReddensLawnCare ReddensLawnCare is online now
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Quote:
Originally Posted by Toro 44 View Post
Sulfate of Potassium aka Potassium Sulfate.

Hey AR,

I saw in a 2011 thread on liquid fert that you told green doctor that you found an affordable source for soluble SOP. Did you ever try spraying it?
Thank you
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Old 03-05-2014, 01:04 AM
greendoctor greendoctor is offline
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In acidic clay, you want calcium nitrate as your N source and potassium nitrate for the K. No, it will not defloculate the soil provided you pay attention to the calcium levels. Because I often need to use calcium nitrate to correct magnesium excesses, sodium excesses, and acidic soil, potassium sulfate is no good for me. It forms concrete if mixed with calcium nitrate. I can also tell you that a good rule is no more than 1 lb of N per 10 gallons of solution. Especially in dry, non irrigated lawns. That rule is broken with me because I am spraying on lawns that were watered that morning and I am going to short cycle the system after application.
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Old 03-05-2014, 07:18 AM
ArTurf ArTurf is offline
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Quote:
Originally Posted by Toro 44 View Post
Sulfate of Potassium aka Potassium Sulfate.

Hey AR,

I saw in a 2011 thread on liquid fert that you told green doctor that you found an affordable source for soluble SOP. Did you ever try spraying it?
No I didn't, I'm not really set up well for liquid fert.

I have my dry ferts custom blended to use SOP, maybe that's what I was speaking of.
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Old 03-05-2014, 08:53 AM
jalderfer63 jalderfer63 is offline
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Have you tried Synatek out of Souderton.They have some good liquid fert options.
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