Button Ads!         



                  GrowStoreFinder.com Grow Shop Directory            1-15-2014                              GreenBookPages.com Grow Shop’s Directory Product Reviews 
         Local grow shops and hydroponic store locator with reviews                      
Find Local Hydroponics Shops and Grow Stores.   10-10-14  
Mega Text Ad’s Spaces Available! 
                                                                                   Advertise On All 3 Of Our Marijuana Websites   


  We Update Daily!

Chris S. Kenoyer. Owner
MMJ Patient, Medical Activist,
Online Patients Advocate, 
Online MMJ News Journalist 

My Personal Medical Bio 

Follow Us Now On Twitter


Or Follow Us Now
  On Facebook

        Email Us Here

Or Email Us Securely Here
NEW 100% Encrypted Email Server

OLP’s Free MMJ News EList  
Get The Latest In MMJ News

Press Contact Info

 Is CBD?  A Possible Cure For
Breast Cancer..? And All The Other
Many Forms & Types Of Cancer..?
Learn More About CBD Here


Advertise Here On OnlinePot
Rates As Low As  $50 a Year
24/7 – 365 Days A Year Of Sales! 


Website Navigational Links

Main Start Page 2


Latest Marijuana News Reports


Parody’s Cartoons US 
Government Grown Pot,
Term Papers, School 
Reports, & Thesis’s On  
Marijuana & Cannabis


Amsterdam A to Z


Canadian Marijuana Websites


Church’s & Pot Cannabis


Co-Ops, Clinics, Dispensary’s 


Marijuana Doctors & Clinics 


Pot Cooking Recipes


Drug Testing A To Z


Pot Games


Pot Songs Video’s


100’s Of Grow Guides  


Hash A- Z


Cannabis Legal Info, Drug 
Lawyers, State, Federal Laws, 
State  & Supreme Court Rulings


POW’s Of The MMJ War!


Other Marijuana Websites 
Reciprocal Link Exchange


Medical Marijuana Studies, 
Research Report’s, Medical
Cannabis Clinic Study’s


Parody’s & Cartoons  
When We All Need A Good Laugh!  


Avoiding Online MOM Scammers
Newly Re-Updated Info!


The Politics Of Contraband 
Medical Marijuana In The Mail?


The Hall Of Shame Section
The Online MOM Scammers 


Online MOM Providers Ads


Politicians & Voters Rights


Medical Marijuana, Strains 


The OG  Marijuana Strain Guide


800+ FAQ Growing Questions


Patients Spiritual Guidance,
Free Online Crisis Help Center


Online Marijuana Seed Banks


Maximum Security Section 
      Just Updated!    


Traveling Tips, Guides, B & B’s


Vaporizers A To Z


Online Pot Video’s & Movies


Please Visit Both Of Our Sister Websites!

Maine Patients Coalition.org

The Reefer Madness Teaching Museum.org 

Listen Right Here Online! 
To Original 1930-1950’s
Reefer Madness Propaganda 
Radio Shows And Programs
Before TV There Were 
"Radio Stars"





Legal Disclaimer

Guest Book

Translate Text or Web Page Go To:
Language Tools Google Translations

Article Submissions &  News
Reports Are Always Gladly
Accepted Here.


No part of this site maybe used or
reproduced in whole or in part
without the written consent of the
Copyright Owner

1999-2013 Copyright
? All rights reserved

OnlinePot assumes no legal liability for any products, or information or  
news posted, services offered,  Or
any contests or give away’s offered.




GrowFAQ :

How do I figure out the ppm of my fertilizer mix?

  Added by: snoofer  Last edited by: snoofer  Viewed: 189 times   Rated by 2 users: 9.00/10
Contributed by: diels alder

To figure out the ppm of your fertilizer (or fertilizer mix), you need to be able to measure grams (to a few decimal places unless you are making a lot of solution) and liters. Look at the numbers on the back of a fertilizer bag.

The pitfall to be avoided here is that the fertilizer manufacturers list some of the nutrients as their oxide, like K2O for potassium and P2O5 for phosphate. In the ‘guaranteed analysis’ there will be a list of compounds, and elements and their % content (supposedly, see conversions below).

For every one gram of said fertilizer in one liter of water, it contributes 10 ppm of the given nutrient per percentage point. A 20-20-20 gives 200 ppm (10 ppm X 20) of each nutrient for each gram in a liter of water.

The formula:

  • grams of fert per liter = A/B

    A=your desired ppm
    B=10 ppm X the %(not in decimal form) of nutrient in mix


  • your ppm = C X B

    B=10 ppm X the % of nutrient in mix
    C= grams of fert per liter

    To convert from compounds to elements:

    P = P2O5 X 0.44
    K = K2O X 0.83
    Mg = MgO x 0.60

    You’ll need to determine the Ca source to determine actual soluble Ca content:
    Ca = CaCO3 X 0.4 for calcite or soluble Ca source
    Ca = CaCO3 X 0.23 for dolomite

    This is important to know, because the method the fertilizer manufacturers use to label the bags overstate the actual content. This is just the way they label the product, and says nothing about what form the nutrients are really in.

    So, to make a 200 ppm N, 100 ppm P, 200 ppm K mix using a 130-44 (potassium nitrate), a 1262-0(monoamonium phosphate), and a 330-0 (ammonium nitrate) you would work backwards from your sole P and K sources (it makes it easiest in this case), and make up the N at the end.

    You would use 0.55 g of potassium nitrate (200 ppm/(10 ppm X 44 K2O X 0.83)) and 0.37 g of monoammonium phosphate (100 ppm/(10 ppm X 62 P2O5 X 0.44)) in one liter.

    This would give you 116 ppm N (10 ppm X 13N X 0.55g + 10 ppm X 12 N X 0.37 g), 101 ppm P (10 ppm X 62 P2O5 X 0.37g X 0.44), and 201 ppm K (10 ppm X 44 K2O X 0.55g X 0.83). 84 ppm are needed to raise the N to the 200 ppm level, so we can use 0.25 g of the ammonium nitrate (84 ppm/(10 ppm X 33 N)) to bring us up to finish.

    The actual mix would yield: 199 ppm N, 101 ppm P, 201 ppm K mixture in one liter of water. To get more precision, you need to mix larger batches or get a better scale (you would need to make a 100 liter batch of the above with a scale that is only accurate to the gram).

    If you mix your own ferilizer, you can adjust your N source to meet your pH needs (see the FAQ), rather than being dependant on adding acid or base, which is nice.

    This works for formulating hydro mixes, as well as for us dirt farmers.

  •   Last modified: 22:25 – Feb 07, 2003  
    Quicklink:  http://overgrow.com/growfaq/1419
    GrowFAQ © 2000-2004 Overgrow
    faq:1419 “How do I figure out the ppm of my fertilizer mix?”