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Old 05-30-2014, 09:07 PM
Fubba Fubba is online now
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Bermuda Lawns turning yellow

Yesterday I applied this mix at 3 gpm:
1 lb per 1,000 sq ft of N from Ammonium Sulfate
Celsius at 0.085 oz per 1,000 sq ft
A light NIS at 0.125% solution.

Highs were almost 90. Started spraying around 10:00 and finished around 2 before doing maintenance.

Any idea what was wrong? I'm positive on all my numbers. Went by and turned all irrigation on this evening. I'm very concerned.
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Old 05-30-2014, 10:18 PM
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Firefighter337 Firefighter337 is offline
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Could be the herbicide at close to 90* Celsius in my experience can be pretty harsh at higher temps.

We have had some pretty warm days consecutively.

I think it should recover after some rain or water.
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Old 05-30-2014, 10:27 PM
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Firefighter337 Firefighter337 is offline
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http://www.backedbybayer.com/system/...vant-Guide.pdf

Says not to add an adjuvant above 90* or damage can occur. N or nis
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Old 05-30-2014, 10:34 PM
Fubba Fubba is online now
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Thanks for the quick replies. That must have been it.
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Old 05-30-2014, 10:41 PM
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Firefighter337 Firefighter337 is offline
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Good luck. I worry to death over things like this too. I fried my back yard last summer experimenting with msm @ labelled rate near 90* bahia died though.

I dont spray anymore if the highs reach 85* anymore unless its gly in beds.
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Old 05-31-2014, 02:32 AM
greendoctor greendoctor is offline
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The Celsius is fine. You never ever put any kind of surfactant in a liquid fertilizer application. That is why I only put preemergents needing to be watered in with fertilizer. If the grass turns off color that soon after an application, it is fertilizer. Problems with Celsius normally take 10-14 days to show up. 1 lb of N from ammonium sulfate in 3 gallons is way hotter than what I will mix if the lawn is not being sprayed after and right before an irrigation cycle. Doing any of this on a non irrigated lawn means the fertilizer is applied at no more than 1 lb of N per 10 gallons of water. My mixes break that rule because I do not co apply any postemergents and this is being done right between irrigation cycles. Especially if I am applying on a day that is almost 90 and humid.
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Old 05-31-2014, 06:24 PM
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RigglePLC RigglePLC is online now
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Green is right. If it happened right away it is fertilizer burn--usually. You applied way in excess of safe amount of nitrogen as a quick-release all mineral product. At 90 degrees I would apply no more than a half or quarter pound of nitrogen.
Surfactant is fine with liquid fert--in my experience.
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