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Thread: PH and Nutrient Uptake charts!

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    PH and Nutrient Uptake charts!






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    Resident Connoisseur PitViper's Avatar
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    Re: PH and Nutrient Uptake charts!

    great find..

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    Re: PH and Nutrient Uptake charts!

    Quote Originally Posted by PitViper View Post
    great find..
    Thanks PV...here's some more.

    The lesson here is to help you measure and understand the readings you obtain from pH and EC meters...

    Let me first explain what pH & EC mean, and what effects them...
    pH stands for Potential Hydrogen and is a measure of the concentration of hydrogen ions within a solution like water. pH is measured on a scale of 0 to 14 with 0 being acid, 7 is neutral and 14 is alkaline. A substance that when added to water increases the hydrogen ion concentration will cause the pH level to drop. This is known as a acid. A substance that reduces the concentration on hydrogen ions and causes the pH to rise is known a base. There are also some substances that can enable the solution to resist pH changes when an acid or base is added. These are known as buffers. Buffers are very important in helping organisms maintain a relatively constant pH and they are also used to calibrate your pH meter occasionally.

    If the pH of your nutrient solution is too high (alkaline) or too low (acidic), it can restrict the uptake of nutrients through the roots of your plants. Many different variables such as evaporation, amount of light and temperature can affect pH levels. Most plants can accept a pH range of between 5 and 7. Any extremes either side of that range will cause the plants to be blocked from certain nutrients. In low light, plants take up more potassium and phosphorus from the nutrient solution so the acidity increases (pH drops). In strong intense light, plants take up more nitrogen from the solution so the acidity decreases (pH rises). Any extremes of pH can also result in precipitation of certain blocked nutrients.

    For plant roots to be able to absorb nutrients, the nutrients must be dissolved in a solution. The process of precipitation (the reverse of dissolving) results in the formation of solids in the nutrient solution, making the nutrients unavailable to the plants. Precipitation can also take the form of an almost invisible film of an oily look on the surface of your water.

    EC stands for Electrical Conductivity and is a measure of the strength of the nutrient solution. The higher the conductivity, the more dissolved solids there are in the solution. EC is just one format of measuring the nutrients. It can also be measured in PPM (Parts Per Million), and TDS (Total Dissolved Solids). EC is the standard these days and is used in Canada, Europe, and most other places...

    Plants at different stages of growth need different amounts of food in their solution. Delicate plants like cuttings and seedlings requre the EC to be quite low so as to avoid fertilizer burn from over-feeding. As the plant gets older the food concentration can be increased (EC raised) so the plants have access to more nutrients in the water. Low conductivity at this point or low strength nutrient solutions will result in nutritional deficiencies and slow growth rates of your plants. EC can be affected by many variables too. Evaporation, temperature and ventilation are all factors that affect the EC level in your solution aswell...

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    Re: PH and Nutrient Uptake charts!

    Great info man. Thanks for posting this as now it's so much easier to reference than looking this stuff up on the internet. +rep for putting it all into perspective.

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    Re: PH and Nutrient Uptake charts!

    Can I buy EC meters at local hardware shops? if not where can I get them without using internet.

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    Re: PH and Nutrient Uptake charts!

    Quote Originally Posted by Noobert View Post
    Can I buy EC meters at local hardware shops? if not where can I get them without using internet.
    other then a hydro store, try places that sell plants, nurseries, home depot, they're more likely to carry them.

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    Re: PH and Nutrient Uptake charts!

    Nice post amigo

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    420 Member wtfruthinking's Avatar
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    Question Re: PH and Nutrient Uptake charts!

    LED- Wondering if you know what the reason may be for ph levels to rise instead of fall. I tested for chlorine and measured my ph for the flowers and it was set at 6.3 (flushed with new water) Next day it was 8.0. I used 2 different ph meters and 2 different manual PH Test Indicator methods...all confirming that it was extremely high.

    Same thing happened in the veg room. I freaked out and checked my cloning bucket and it rose from 5.8 to 7.0.

    I'm totally at a lost. Any idea?



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    On Vacation 3lions's Avatar
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    Re: PH and Nutrient Uptake charts!

    LED- Wondering if you know what the reason may be for ph levels to rise instead of fall. I tested for chlorine and measured my ph for the flowers and it was set at 6.3 (flushed with new water) Next day it was 8.0. I used 2 different ph meters and 2 different manual PH Test Indicator methods...all confirming that it was extremely high.

    Same thing happened in the veg room. I freaked out and checked my cloning bucket and it rose from 5.8 to 7.0.

    I'm totally at a lost. Any idea?

    Nutes will take it up of course, I presume you are adding nutes or have time release soil that releases nutes?

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    420 Member wtfruthinking's Avatar
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    Re: PH and Nutrient Uptake charts!

    Quote Originally Posted by 3lions View Post
    Nutes will take it up of course, I presume you are adding nutes or have time release soil that releases nutes?
    OOps// didn't realize this was was "soil" ..I'm growing hydro and flushing with plain water and only water. Any idea what could be causing it to increase like that?

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    Re: PH and Nutrient Uptake charts!

    well excuse me for trying to be helpful. have fun

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    Re: PH and Nutrient Uptake charts!

    Quote Originally Posted by wtfruthinking View Post
    LED- Wondering if you know what the reason may be for ph levels to rise instead of fall. I tested for chlorine and measured my ph for the flowers and it was set at 6.3 (flushed with new water) Next day it was 8.0. I used 2 different ph meters and 2 different manual PH Test Indicator methods...all confirming that it was extremely high.

    Same thing happened in the veg room. I freaked out and checked my cloning bucket and it rose from 5.8 to 7.0.

    I'm totally at a lost. Any idea?


    temperature changes ph quite a bit also the bigger the rez of water the more stable it is...nutes tend to lower the ph slightly and should be added first...water in a bucket will change rapidly as the temp changes..to help them a bit place styrofoam insulation under them or work out a circulating system...hydro is best with water between 67-70 if possible...try to do the water a head of time and it will stabilize better....always takes a good half to a day to stabilize a big 50 gal rez but it will last close to a week

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    420 Member wtfruthinking's Avatar
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    Re: PH and Nutrient Uptake charts!

    Quote Originally Posted by 3lions View Post
    well excuse me for trying to be helpful. have fun
    I'm sorry Lions... Did not mean to offend you in any way. As I was about to respond I noticed that I had posted the question in the "Indoor Soil" section and didn't want to waste anyone's time since I was in the wrong section.

    Thank you for your input..It is much appreciated. Again..I wasn't trying to be rude.

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    420 Member wtfruthinking's Avatar
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    Arrow Re: PH and Nutrient Uptake charts!

    Quote Originally Posted by ledtester View Post
    temperature changes ph quite a bit also the bigger the rez of water the more stable it is...nutes tend to lower the ph slightly and should be added first...water in a bucket will change rapidly as the temp changes..to help them a bit place styrofoam insulation under them or work out a circulating system...hydro is best with water between 67-70 if possible...try to do the water a head of time and it will stabilize better....always takes a good half to a day to stabilize a big 50 gal rez but it will last close to a week
    LED- I'm going to check the temperature and see where it's at.. I didn't realize temperature could make that big of a difference. Thanks for the input.. Hope that solves the problem.. I'll let you know.

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    Re: PH and Nutrient Uptake charts!

    Please also consider that nutrients act as a buffer, meaning that pH will change less radically the more nutes that are present.

    So if you are flushing with plain water (without buffer) changes can be more extreme.

    When in the sweet spot of a hydro nute regime it might take 10 to 15 drops of pH up or down to move the pH 0.5. in plain water this amount could move it 10 times as much.

    Plants take what they need, it's not unusual (in hydro) at a certain phase to be adjusting down, then in another phase, a few weeks later, to be adjusting up.

    Key thing to remember - don't adjust both ways in the same solution

    Best wishes to you

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