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Acidic soil help!

Discussion in 'Marijuana Plant Problems' started by myheartsthecoal, Jul 25, 2008.


    myheartsthecoal Active Member

    i mixed about 1/4 cup lime into my soil last week when i watered my month old plants, and the ph test today came up a 5! Is sphagnum peat moss that acidic? should i add more lime or something else?


    Lokes Active Member

    Sphagnum is very acidic. Here a link for yah.

    Also, might want to transplant into something balanced, as I tried to adjust my soil and its not as easy as it seems.


    myheartsthecoal Active Member

    thanks... what would be a good mix to switch to? currently i have it like this:
    4 parts Miracle Grow potting soil
    1.5 parts Sphagnum Peat moss
    1 part vermiculite
    1 part pearlite
    1/4 cup lime per gallon.

    i have 6 month olds that are struggling and i've got about 20 2 weekolds in plastic cups and peat pots that are the same mix, but minus the limestone.

    help and thanks!

    Lokes Active Member

    That mix doesn't sound bad, but I prefer to stay away from Miracle Grow.

    I'm really surprised your at such a low ph level. Weird.

    As for mixes theres a million. Do a search on this site, and keep it simple for now.

    You can get more advanced as you go, but simple is best until you work up to it.

    You can prob do the same mix you used, without the sphag or the lime.

    myheartsthecoal Active Member

    is regular peat moss less acidic than sphagnum peat moss?

    bonz Well-Known Member

    what is the ph of your water you feed and what nutes are you using?

    myheartsthecoal Active Member

    water is 6.5 and i only fed them once, last week, 1 tbsp each of Espoma 5-10-5 garden food. i watered them today with no food.

    bonz Well-Known Member

    heres a bit of info on ph.

    Beginners pH Guide.

    I posted this yesterday, but I decided to add a few more helpful things and repost it. Sorry for the double posting.

    What is pH?

    pH is the measure of how basic or acidic a solution is. The pH of a substance is measured in a numerical fashion using a scale of 1 through 14. A solution with a pH higher than 7.0 is considered to be basic and is called a base (or alkaline). A solution with a pH less than 7.0 is considered to be acidic and is called an acid. The strength of an acid or base can be either weak or strong. The stronger an acid or base, the closer the solution is to its respective number on the pH scale (basic being 15 and acid being 1). The weaker a solution or base, the closer its pH value is to a neutral rating (neutral being 7). Every full point change in pH signifies a 10 fold increase or decrease in acidity or alkalinity. For example, water with a pH of 6.0 is 10 times more acidic than water with a pH of 7.0, while water with a pH of 5.0 is 100 times more acidic than water with a pH of 7.0.

    Here are some examples of acids and bases and their respective pH ratings.
    -.2 Battery Acid
    1.2 Gastric fluid
    2.2 Lemon juice
    3.6 Orange juice
    4.4 Beer
    5.6 Pure Rain
    6.6 Milk
    7.0 Distilled water (H2O)
    8.0 Seawater
    9.2 Baking soda (NaHCO3)
    10.6 Milk of Magnesia (Mg(OH)2)
    11.4 Household ammonia (NH3)
    12.8 Household bleach (NaClO)
    13.6 Household lye (NaOH)

    What is PH? pt. 2

    pH is defined in chemistry in several ways. An acid is sometimes defined as a solution with the potential to donate a Hydrogen ion (H+, also called a proton), or to accept a Hydroxide Ion (OH-) from a base. A base on the other hand is sometimes defined as a solution with ability to donate a Hydroxide Ion, or... you've guessed it, accept a Hydrogen ion. Low pH corresponds to a high hydrogen ion concentration and vice versa, while a high pH corresponds to a high Hydroxide ion concentration and vice versa.

    Why is pH important when growing a plant?

    Any substance that is going to be used to support any form of life has to fall within a certain range on the pH scale. The range may vary from organism to organism. Marijuana is no different. The soil, nutrient solutions and water all need to be monitored and adjusted to stay within a specific range, depending on your method of growing. When growing Marijuana in soil, the soil and water supply should stay within the range of 6.5 to 7.0, while in hydroponics the nutrient solution should stay within the range of 5.5 and 6.0.
    When a plant's soil or nutrient solution becomes too basic the nutrients become unavailable to be absorbed by the roots. When the soil or nutrient solution becomes too acidic the acid salts will chemically bind together the available nutrients and they will be nonabsorbent by the roots. When this happens the plant will show tell-tale signs of stress. Some novice growers and even a few seasoned growers will falsely think they need to add more nutes or fert, which only compounds the problem by usually causing toxic salt build-up. Toxic salt build-up stops the roots from absorbing water. So remember as a rule of thumb to always test the pH before reducing or increasing a fert or nute dosage!
    The pH of your soil or hydroponics setup can be measured with a simple 20$ or 30$ pH Tester, or small one time paper tests. These are highly recommended when growing any plant.

    Some things to remember when using an electronic pH tester

    1. Clean the probes of the meter after each test and wipe away any corrosion.
    2. Pack the soil tightly around the probes.
    3. Water soil with distilled or neutral pH water (7.0) before testing.
    4. The meters measure the electrical current between two probes and are
    designed to work in moist soil. If the soil is dry, the probes do not give
    an accurate reading

    What causes fluctuations in pH?

    When growing in soil any fertilizer you use can cause an excess build up of salts when it decomposes in the soil. This almost always results in a more acidic soil which stunts the plant's growth and causes brown foliage. When using a Hydroponics set-up the nutrient solution can very easily cause a fluctuation in the growing reservoir. Other common reasons as to why soil may become too acidic when doing outdoor grows are rainfall, leaching, organic matter decay and a previous harvest of a high yeild crop in the same soil. In dry climates, such as the desert Southwest US, Spain, Australia, etc., irrigation water is often alkaline with a pH above 7. The water in rainy climates, such as the Pacific Northwest of North America, the UK, Netherlands and Northern Europe, is often acidic with a pH below 6. Lightly sandy soils with little clay and organic matter are quicker too become more acidic. Another common mistake is that a grower will mix his soil unevenly, leading to "hot spots" in the growing medium, so mix all ratios as well as you can.

    How do I raise/lower my pH?

    A great way to regulate the pH of your soil is to use Dolomite Lime(calcium-magnesium carbonate). While growing Cannabis plants in containers, mix one cup of fine dolomite lime for each cubic foot of soil, then lightly water it. After watering, mix it once more and wait a day or two before checking the pH. While growing in an outdoor garden, follow the dolomite lime manufacturers instructions. Dolomite Lime works well because it has a neutral pH rating of 7.0 and tends to keep the soil a constant pH throughout the entire life cycle of the plant. This is a highly recommended method of regulating your soil pH.
    If you find the pH of your soil or Hydroponic reservoir to be too acidic or basic you could add either pH up or pH down. These are chemicals sold at places like Home Depot or any Gardening store. They usually come in one liter bottles and are to be diluted in the water used to water the soil growing plants or the Hydroponic reservoir according to directions on the packaging.

    Some examples of Home remedies to raise/lower pH are as follows:
    1.Lemon juice. 1/4 tbsp can bring a gallon of tap-water from 7.4 to 6.3.
    2.Phosphoric acid. lowers pH and provides Phosphor too!
    3.Nitric acid. lowers pH.
    4.Hydrochloric acid. strongest way to lower pH
    5.Hydrated lime. flush soil with a teaspoon per gallon of water to raise pH.
    6.Baking Soda. eats acids to raise pH.
    7.Calcium carbonate. raises pH (very strong)
    8.Potassium silicate. raises pH.

    What are signs of a PH fluctuation in my Cannabis plant?

    A Cannabis plant can show signs of a pH flux in several ways. The leaves may begin to turn yellow or brown, dry up and/or shrivel on the sides into a straw like shape. Keep in mind however that other deficiencies and disorders may show the same signs of damage, so don't jump to conclusions until you do some testing and adjusting to your plants and their growing medium.

    Some things to remember(I didn't write these ones)

    1.Always test the pH of raw water and drainage water with a pH meter.
    2.Raw water pH above 6.0 helps keep fertilizer mixes from becoming too acidic.
    3.The pH level is much more important in organic soil gardens than in chemical
    hydroponic gardens. The pH dictates the environment of bacteria necessary to the
    uptake of organic nutrients.

    I hope I helped at least one or two people.
    panhead and ALuckyShot like this.

    socom3riot Well-Known Member

    I brought this subject up in a different part of these forums the other day, got nothing but asshole remarks.. its nice to see that someone else had the same problem as me with the peatmoss.. my ph was sooooooo fkin low, it killed my plants, atleast now I know what the problem was... peatmoss = bad.

    sb101 Well-Known Member

    so i've been having some problems regulating pH, it being too low. my tap water is around 5.5 so perfect for hydro but soil it's too low, plus all the fertilizers i'm putting in lower it even more, except for the pro silicate i guess. but yea, so i just got some pH and have been raising it to around pH of 7, but the runoff is stll right around 5 pH, so should i raise the water even higher to around 8pH or more??

    i also got some dolomite lime i'm going to sprinkle a tablespoon on top of the soil (fox farm ocean forest) or should i try and mix it in? i have about 2 1/2 gallon containers.

    panhead Well-Known Member

    Excellent post my friend,i know how to correct any ph issues i might run across in my grows but i never knew all the book learnins you posted about every last detail covering ph,its good shit to know.

    Plus rep.

    EDIT,a mod should add this post to the grow faq.
    DR. VonDankenstine

    DR. VonDankenstine Well-Known Member

    Dolomite lime application broken down:

    soil ph now in 16 ounce cup----------------------------get to 6.5 soil ph
    4.0-----------------------------1 tablespoon dolomite
    4.5-----------------------------3/4 tablespoon dolomite
    5.0-----------------------------1/2 tablespoon dolomite
    5.5-----------------------------1/4 tablespoon dolomite
    6.0-----------------------------1/8 tablespoon dolomite

    soil ph now in 1 gallon container------------------------get to 6.5 soil ph
    4.0-----------------------------4 tablespoons dolomite
    4.5-----------------------------3 tablespoons dolomite
    5.0-----------------------------2 tablespoons dolomite
    5.5-----------------------------1 tablespoon dolomite
    6.0---------------------------1/2 tablespoon dolomite
    DR. VonDankenstine

    DR. VonDankenstine Well-Known Member

    how much soil did you apply the lime to?

    thegreensurfer Well-Known Member

    if your plants are already potted and its too late to mix the lime with your soil, heres what works for me: mix up the dolomite in the watering container. the lime dissolves in the water and you water with that, drenching all of your soil with the lime mixture. whereas sprinkling on top may take some time to work its way down the container.

    TeAmoMota Member

    old post.. but i'm experiencing some very low ph as well. my soil tester is reading ~4 despite flushing with 1 tbsp of hydrated lime with 2 gallons of water amongst 6 pots (4 - 2gallon, 2 - 3 gallon). I dont want to overwater to avoid root rot especially since the plants are young and in a bigger pot.

    my plants are young ~17 days from seed and have been in the mixture of 50/50 perlite/peat moss (yes i was an idiot and failed to check soil ph prior to transplanting and didn't use lime) for about 9 days now.

    the water i used was ph 8.5 with the lime.. and yet it only managed to raise my ph .5 .

    my plants don't appear to be stressed really. but maybe it's just a matter of time. they are all growing at a rate of ~1/2" height and 1.5" width a day.

    i should be getting some garden lime soon to correct it (hopefully a top dress will do the trick).

    how long will they grow with this low ph stress before they die.. or will they just continue, possibly stunted?

    Wetdog Well-Known Member

    Get the garden lime and top dress.

    Just be aware before you get impatient and over do things, lime takes some time to work, even hydrated.

    It's very easy to over apply hydrated lime and I would not use any more. It's almost impossible to over apply garden lime since it's just ground limestone. Hydrated has been chemically altered.


    TeAmoMota Member

    yea it is just a temporary solution until the store gets more garden lime. the hydrated lime has already started to take affect and has raised soil ph to 5-5.5. i will continue to monitor. what's the best ph for soilless?

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