Prodiamine question on app rates
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Prodiamine question on app rates
I am trying to make sure I understand the label instructions. My goal is to do two applications, one now and one in the spring, for Poa Annual and Crabgrass control.
I read that the application rate is 0.185-0.55oz per K, but I'm unsure how to select a value in this range. I figured it was grass type specific, but not sure. Since I'm inpatient, I guessed and applied today at 0.3oz/k (I think anyhow). I calculated that .3 oz/k x 7,500k = 2.25 oz. = 4.5 tablespoons. I just noticed that the label, however, shows that the 0.37 oz/k is equivalent to 1 tablespoon/k which would be a much larger 7.5 tablespoons for my 7,500 example.
My questions are: Is this rate about right for my KBG mix yard for 2 apps? what is the correct amount for this rate and area? ...and, if I got it wrong on the low side, should I apply again in 3 months?
Thanks guys!
Kent
I read that the application rate is 0.185-0.55oz per K, but I'm unsure how to select a value in this range. I figured it was grass type specific, but not sure. Since I'm inpatient, I guessed and applied today at 0.3oz/k (I think anyhow). I calculated that .3 oz/k x 7,500k = 2.25 oz. = 4.5 tablespoons. I just noticed that the label, however, shows that the 0.37 oz/k is equivalent to 1 tablespoon/k which would be a much larger 7.5 tablespoons for my 7,500 example.
My questions are: Is this rate about right for my KBG mix yard for 2 apps? what is the correct amount for this rate and area? ...and, if I got it wrong on the low side, should I apply again in 3 months?
Thanks guys!
Kent
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Re: Prodiamine question on app rates
for KGB, annual limit is 0.55oz /k, so 2 apps at 0.3oz each will put you a little over the limit.
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Re: Prodiamine question on app rates
I'm guessing you're using the Prodiamine 65? That's only 65% prodiamine...the rest is fillers. Your math is correct, but not complete. You forgot to divide your 4.5 tablespoons by 0.65.
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Re: Prodiamine question on app rates
What you actually put on your yard: (.3 oz of powder / K) * (.65 prodiamine) = .195 oz / K of prodiamine
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Re: Prodiamine question on app rates
Yes, it is Prodiamine 65. Now I understand... Thank you!
Any recommendations on next steps on the application plan?
Any recommendations on next steps on the application plan?
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Re: Prodiamine question on app rates
The label says oz per product, so it's already factoring in the 65%.
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Re: Prodiamine question on app rates
Yes. The label accounts for that. However, when trying to calculate the rate by yourself, without looking at the label, you have to remember the 65%.
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Re: Prodiamine question on app rates
Ok, I finally have some time to figure this out. After carefully reading the specimen label a few times, I think that I had the application rate correct and the label takes into account the concentration. My plan this coming season is to put down 0.25oz/k in two applications giving 0.50oz for the calendar year since I have a good bit of crabgrass and poa that I am hoping to get under control.
Questions
Kent
Questions
- Does anyone understand why they specify the range for maximum application rate (e.g. 0.185-0.55)? Is this just a conservative to aggressive? If so, what factors might drive your decision on the spectrum?
- It looks like the label starts at lbs/acre, but gives different conversion rates to oz/k and then even tablespoons. Is this just sloppy label work or am I missing something?
Kent
- andy10917
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Re: Prodiamine question on app rates
Sloppy? Hell no - it's one of the best labels out there.
There are a few things at play here. The largest is that you're not looking at a label that is intended to be read by homeowners - it's a professional product and you bought it. The labels are very different from what's on a product you'd find at Home Depot. There is a ton of flexibility in the provided label - everything from what length of time you want to control weeds for, weight measurement, volume measurement, climate zone and grass type.
You need to identify your zone ("North"), and how many months of control you want (from Figure 1) and stay under the maximum amount to your grass types (NoMix is generally KBG/PR/FF). The max rate for FF is lower than KBG or PR - you'll have to decide if you have enough FF in the lawn to use the lower maximum.
Be careful not to use tables that are for landscape plants and ornamentals.
The amounts are correct for weight (lbs/acre or oz/K) or volume (teaspoons) - again, more flexibility.
This is exactly what happens when homeowners try to work with a professional product - the flexibility of the label can be overwhelming!!
There are a few things at play here. The largest is that you're not looking at a label that is intended to be read by homeowners - it's a professional product and you bought it. The labels are very different from what's on a product you'd find at Home Depot. There is a ton of flexibility in the provided label - everything from what length of time you want to control weeds for, weight measurement, volume measurement, climate zone and grass type.
You need to identify your zone ("North"), and how many months of control you want (from Figure 1) and stay under the maximum amount to your grass types (NoMix is generally KBG/PR/FF). The max rate for FF is lower than KBG or PR - you'll have to decide if you have enough FF in the lawn to use the lower maximum.
Be careful not to use tables that are for landscape plants and ornamentals.
The amounts are correct for weight (lbs/acre or oz/K) or volume (teaspoons) - again, more flexibility.
This is exactly what happens when homeowners try to work with a professional product - the flexibility of the label can be overwhelming!!
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- Joined: August 9th, 2015, 7:08 pm
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Re: Prodiamine question on app rates
oz is a unit of weight, tablespoon is volume, both would work but I found using a measuring spoon is easier than a weight scale.
Edit: conversion between weight and volume is not as straightforward because of the unknown density, they made things easier by including both on the label.
Edit: conversion between weight and volume is not as straightforward because of the unknown density, they made things easier by including both on the label.
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Re: Prodiamine question on app rates
Makes sense. Unfortunately, they convert differently on the same label. Thank you for reminding me about weight and volume though!seiyafan wrote: ↑November 30th, 2018, 6:22 pmoz is a unit of weight, tablespoon is volume, both would work but I found using a measuring spoon is easier than a weight scale.
Edit: conversion between weight and volume is not as straightforward because of the unknown density, they made things easier by including both on the label.
- andy10917
- Posts: 29739
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Re: Prodiamine question on app rates
I didn't see anything that was a bad conversion between weight and volume - can you point out the suspected problem?
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- Posts: 120
- Joined: June 21st, 2018, 6:48 pm
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- Grass Type: Northern mix
- Lawn Size: 10000-20000
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Re: Prodiamine question on app rates
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