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Old 03-18-2013, 12:33 AM
wrooster wrooster is offline
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Guideline for initial fertilizer/pre-em application?

Gents,

Is there a basic rule-of-thumb in terms of average temperature (specifically soil temperature) for initial springtime application of N and pre-emergent?

Right now in north/central NJ, the soil temperature is a bit lower that normal -- as there has been little sign of spring to date, and in fact it's 28'F outside right now.

Clicking here shows soil temperature to be about 40'F:
http://climate.rutgers.edu/njwxnet/m...erature1&t=cur

So...

a) there isn't much sign of the turfgrass coming out of dormancy. I have TTTF (Johnathan Green Black Beauty Ultra, specifically).
b) waiting for the 2nd cut of the grass this year seems perhaps a bit late for effective pre-emergent application.
c) when, then?
d) would it be beneficial to split application of the N and pre-emergent, rather than using a single integrated product?

Thanks,
Wrooster
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Old 03-18-2013, 01:06 PM
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DA Quality Lawn & YS DA Quality Lawn & YS is offline
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First off you are jumping the gun to the extreme thinking you are close to flinging out fert and pre now.
Hold the horses.
Crab begins to germinate at 50 deg. soil temps, and that has to be a consistent temp not just a daytime hi temp.
Around there, that doesn't happen normally until mid May or so. Last year was anomaly. You have to adjust each year. Find a soil temp website online to use, or go according to your own meter.
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Old 03-18-2013, 03:42 PM
wrooster wrooster is offline
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Are you perhaps posting from a smartphone?

Quote:
Originally Posted by DA Quality Lawn & YS View Post
First off you are jumping the gun to the extreme thinking you are close to flinging out fert and pre now. Hold the horses.
Where did I mention above that I was looking to apply anything right now?

Quote:
Originally Posted by DA Quality Lawn & YS View Post
Crab begins to germinate at 50 deg. soil temps, and that has to be a consistent temp not just a daytime hi temp. Around there, that doesn't happen normally until mid May or so. Last year was anomaly. You have to adjust each year. Find a soil temp website online to use, or go according to your own meter.
Above, in my original post, you may see a link to just such a website.

My question:
Quote:
Originally Posted by Wrooster
Is there a basic rule-of-thumb in terms of average temperature (specifically soil temperature) for initial springtime application of N and pre-emergent?

Wrooster
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Old 03-24-2013, 12:46 AM
boss75 boss75 is offline
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Quote:
Originally Posted by DA Quality Lawn & YS View Post
First off you are jumping the gun to the extreme thinking you are close to flinging out fert and pre now.
Hold the horses.
Crab begins to germinate at 50 deg. soil temps, and that has to be a consistent temp not just a daytime hi temp.
Around there, that doesn't happen normally until mid May or so. Last year was anomaly. You have to adjust each year. Find a soil temp website online to use, or go according to your own meter.
Hello, do you know of such a web site that that would give me the temp. for SE Mich.
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Old 04-01-2013, 01:18 PM
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Grassmechanic Grassmechanic is offline
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Quote:
Originally Posted by boss75 View Post
Hello, do you know of such a web site that that would give me the temp. for SE Mich.
http://www.gddtracker.net/
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Old 04-01-2013, 12:29 PM
Kiril Kiril is offline
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Quote:
Originally Posted by DA Quality Lawn & YS View Post
First off you are jumping the gun to the extreme thinking you are close to flinging out fert and pre now.
Hold the horses.
Crab begins to germinate at 50 deg. soil temps, and that has to be a consistent temp not just a daytime hi temp.
Around there, that doesn't happen normally until mid May or so. Last year was anomaly. You have to adjust each year. Find a soil temp website online to use, or go according to your own meter.
The potential for crabgrass to germinate when soil surface temp is 50F degrees is low. The temperature you should be using is when soil surface approaches 60F on average and over.
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Old 04-01-2013, 12:52 PM
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Yatt Yatt is offline
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Quote:
Originally Posted by Kiril View Post
The potential for crabgrass to germinate when soil surface temp is 50F degrees is low. The temperature you should be using is when soil surface approaches 60F on average and over.
Hi Kiril,

That is my understanding too. Once you hit 60 degrees three consecutive days and crab grass can start to germinate. Granted it is the starting point as it continues ALL season long.
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Old 03-19-2013, 11:09 AM
Smallaxe Smallaxe is offline
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After the second mowing would be a fine time for both fert and pre-m... the grass tells you more about how conditions in the soil are than average temp websites...
Depending on your HEAT conditions such as sandy soils with thin grass baking in the sun all day, may very well quickly have CG germinating as soon as the second mowing is finished...
If you have realitively thick grass on fertile soils and partial shading from nearby trees throughout the day ,,, you may not see CG until the mid-Summer period...

There is no One-Size-Fits-All button...
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Old 03-24-2013, 04:35 PM
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RigglePLC RigglePLC is offline
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Neither of my soil temp links is working. Maybe they think it is too early to start. You could assume that crabgrass will arise on about the first frost-free date in your area.
http://www.farmersalmanac.com/weathe...e-frost-dates/
Crabgrass is killed by frost of course.
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Old 03-24-2013, 05:31 PM
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GreenUtah GreenUtah is offline
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Since the almanac was mentioned, you can also use forsythia as a visual clue in the northern climes. It will generally set its blooms when the soil temperature is approaching germination temps.

As mentioned earlier, turf with south/southwest exposures, surrounded by cement, asphalt, reflected light/heat, thin and dry, etc. etc. will go sooner. If you can locate and visually cue off a forsythia bush in those circumstances, you may not need to soil temp sample each day if that's not your thing.
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