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Old 09-13-2020, 01:22 PM #1
Los_Serpent
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How to find the right dose of fertilizer

I'm trying a new thing, I got tired of spending plenty of money on fertilizer. And bought a 15 7 15 fertilizer that has pretty much everything I need. It was not meant for weed so I don't know the dosages

I have a huge plant in a 18 liter bucket. It's granural fertilizer but I'm gonna dissolve it in water. How can I figure out dosage based on the fact that it is 15 7 15?
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Old 09-13-2020, 04:11 PM #2
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Do you have access to a ec/ppm meter? Just stay under 1000ppm for starters and you should be good.

Most powdered fertilizers are around 1 tsp per gallon.
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Old 09-13-2020, 05:13 PM #3
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If dissolving in water....maybe crush the granules as they don't dissolve easily. Granular fertilizer is meant to be slow long term over a few months period. Maybe 1- 1.5 TBS per 1 liter of water. Less is more. Try it at 1 fertilization watering followed by water only and see how plants react.
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Old 09-13-2020, 05:32 PM #4
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Quote:
Originally Posted by aridbud View Post
If dissolving in water....maybe crush the granules as they don't dissolve easily. Granular fertilizer is meant to be slow long term over a few months period. Maybe 1- 1.5 TBS per 1 liter of water. Less is more. Try it at 1 fertilization watering followed by water only and see how plants react.
How long does it take to see if it's doing damage or if its good?
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Old 09-13-2020, 06:51 PM #5
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I'll give you a tip. Use as little as possible and only increase as needed. It's better to underfed vs overfeed.

BTW: Usually there's dosage recommendation on a label on the container. If not Google the fertilizer brand online for more info.
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Old 09-14-2020, 05:52 PM #6
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Granular in most cases means also coated for slow release.....those little blue balls generally...If so this may give u problem on the long run...crushin it it wont help i think...
Maybe you should get your hands on some "Soluble" all purpose nute similar to the one u have but explicitly called soluble...
Or also jack's or megacrop or yara


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Old 09-14-2020, 11:56 PM #7
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15/7/15 converts to 15/3/12.5

Used at 1g (1000mg} per liter will give you:
N - 150mg (150ppm)
P - 30ppm
K - 125ppm

Does this fert have any Ca, Mg or micros?
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Old 09-15-2020, 01:14 AM #8
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Quote:
Originally Posted by Grapefruitroop View Post
Granular in most cases means also coated for slow release.....those little blue balls generally...If so this may give u problem on the long run...crushin it it wont help i think...
Maybe you should get your hands on some "Soluble" all purpose nute similar to the one u have but explicitly called soluble...
Or also jack's or megacrop or yara

And yeah a EC pen is always your friend!
Wow! I have used plenty of blue granule fertilizers in my day. I never had a problem diluting them! ???
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Old 09-15-2020, 01:19 AM #9
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Quote:
Originally Posted by hyposomniac View Post
15/7/15 converts to 15/3/12.5

Used at 1g (1000mg} per liter will give you:
N - 150mg (150ppm)
P - 30ppm
K - 125ppm

Does this fert have any Ca, Mg or micros?
I will open my wallet but, I'm not about to open my wallet with your math! (being facetious, is that Trump math?) You simply cannot apply a 'factor" to both P&K and not apply it to N. What king of math is that?

My reaction to the Q was reduce the recommended dosage by 1/3, to bring you in line to what we use. Then of course we have Cal/Mag and others. But...
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Old 09-15-2020, 04:33 AM #10
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Quote:
Originally Posted by Switcher56 View Post
I will open my wallet but, I'm not about to open my wallet with your math! (being facetious, is that Trump math?) You simply cannot apply a 'factor" to both P&K and not apply it to N. What king of math is that?

My reaction to the Q was reduce the recommended dosage by 1/3, to bring you in line to what we use. Then of course we have Cal/Mag and others. But...

Label ( N, P2O5, K2O )
P = P2O5 x .44
K = K2O x .83


15-7-15

15

7 x .44 = 3.08

15 x .83 = 12.45


1 gram in 1 liter = 150 N 30.8 P 124.5 K


More math, Less bullshit.
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