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Old 05-08-2019, 07:06 AM #1
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I have an (NPK) question.

My question is how much NPK does rain water have? More so how much P AND K does rain have?

I spent the last 30 minuts on google researching for anything related to my question but found nothing that gave me a scientific answer.

Question 2 is does rain water contain enough phosphorus to help with the flower growth or should i be also mixing in bloom food with the rain water i give my blooming mj indoor plants? Also she us more than half way through the flowering cycle.
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Old 05-16-2019, 11:15 PM #2
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• For example,
- in the nitrate analysis the content is expressed as mg / L of NO3- as N,
- which means that the nitrate content is expressed as nitrogen content,
- a concentration of 10 mg NO3 - N / L (expressed as N) is equivalent to 44 mg NO3- (expressed as NO3-). , a concentration of 10 mg NO3 - N / L (expressed as N) is equivalent to 44 mg NO3- (expressed as NO3-)
- the factor of 4,4 is the ratio of the relative molecular mass of the nitrate ions (= 64) and the relative molecular mass of the nitrogen element (= 14).
- PO43-, often expressed as P (PO43- -?), And also for SiO2 which can be expressed as Si

translated from a study in croatia.. i can send you a full pdf if you think it could help
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Old 05-16-2019, 11:21 PM #3
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https://rudar.rgn.hr/~fkapor/nids_fk...%20prirodi.pdf

heres the link in advance and translate it.. like i said, its Croatian language
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Old 05-16-2019, 11:28 PM #4
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Think about it. Rain doesn't have enough nutrients to grow plants.

If it did why would fertilizers exist?
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Old 05-17-2019, 06:37 AM #5
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Mate. Rain water has negligible nutrients. Effectively none. Water evaporates-leaving all dissolved solutes behind- transpires-condenses and then forms precipitate= rain. When people do this in a lab, it’s called distilled water.
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Old 05-21-2019, 08:54 PM #6
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Quote:
Originally Posted by GrimyGreasy View Post
Mate. Rain water has negligible nutrients. Effectively none. Water evaporates-leaving all dissolved solutes behind- transpires-condenses and then forms precipitate= rain. When people do this in a lab, it’s called distilled water.
To be fair, thunderstorm storm water does have a fair amount of Nitrogen; lightning will fix atmospheric nitrogen.
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Old 05-21-2019, 09:00 PM #7
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Originally Posted by CaptinFunk View Post
To be fair, thunderstorm storm water does have a fair amount of Nitrogen; lightning will fix atmospheric nitrogen.
Seriously? Do you have a link with some info about it?
Thanks in advance.
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Old 05-22-2019, 12:31 AM #8
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Rainwater has about zero nutrients in it. Pay about 30 bucks for a water analysis and you will easily confirm this.
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Old 05-22-2019, 02:08 PM #9
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Seriously? Do you have a link with some info about it?
Thanks in advance.
https://www.biology-pages.info/N/NitrogenCycle.html


"Atmospheric Fixation
The enormous energy of lightning breaks nitrogen molecules and enables their atoms to combine with oxygen in the air forming nitrogen oxides. These dissolve in rain, forming nitrates, that are carried to the earth.

Atmospheric nitrogen fixation probably contributes some 5– 8% of the total nitrogen fixed."
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Old 05-22-2019, 04:29 PM #10
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nitrogen molecule (N2) is quite inert = chemically inactive.
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