What do the different nutrients mean to Cannabis?

Smokin Moose

Fallen Cannabis Warrior & Ex Moderator
The Nutrients:

Nitrogen - Plants need lots of N during vegging, but it's easy to overdo it. Added too much? Flush the soil with plain water. Soluble nitrogen (especially nitrate) is the form that's the most quickly available to the roots, while insoluble N (like urea) first needs to be broken down by microbes in the soil before the roots can absorb it. Avoid excessive ammonium nitrogen, which can interfere with other nutrients. Too much N delays flowering. Plants should be allowed to become N-deficient late in flowering for best flavor.

Magnesium - Mg-deficiency is pretty common since marijuana uses lots of it and many fertilizers don't have enough of it. Mg-deficiency is easily fixed with ¼ teaspoon/gallon of Epsom salts (first powdered and dissolved in some hot water) or foliar feed at ½ teaspoon/quart. When mixing up soil, use 2 teaspoon dolomite lime per gallon of soil for Mg. Mg can get locked-up by too much Ca, Cl or ammonium nitrogen. Don't overdo Mg or you'll lock up other nutrients.

Potassium - Too much sodium (Na) displaces K, causing a K deficiency. Sources of high salinity are: baking soda (sodium bicarbonate "pH-up"), too much manure, and the use of water-softening filters (which should not be used). If the problem is Na, flush the soil. K can get locked up from too much Ca or ammonium nitrogen, and possibly cold weather.

Phosphorous - Some deficiency during flowering is normal, but too much shouldn't be tolerated. Red petioles and stems are a normal, genetic characteristic for many varieties, plus it can also be a co-symptom of N, K, and Mg-deficiencies, so red stems are not a foolproof sign of P-deficiency. Too much P can lead to iron deficiency.

Iron - Fe is unavailable to plants when the pH of the water or soil is too high. If deficient, lower the pH to about 6.5 (for rockwool, about 5.7), and check that you're not adding too much P, which can lock up Fe. Use iron that's chelated for maximum availability. Read your fertilizer's ingredients - chelated iron might read something like "iron EDTA". To much Fe without adding enough P can cause a P-deficiency.

Manganese - Mn gets locked out when the pH is too high, and when there's too much iron. Use chelated Mn.

Zinc - Also gets locked out due to high pH. Zn, Fe, and Mn deficiencies often occur together, and are usually from a high pH. Don't overdo the micro-nutrients-lower the pH if that's the problem so the nutrients become available. Foliar feed if the plant looks real bad. Use chelated zinc
2 things.

If you ask a question here in a thread, don't expect a 420 rep to answer you.
Post a new thread with your specific question and it is more likely to be seen.

If you have a question, you can always do the research yourself.
Google the information on Epson salts as fertilizer and read up on it.

I did just now and got lots of info.

Let me google that for you
yo kriz, i recently joined this forum, seems aight to me

you know, chicagoJoe was just repsonding to your flame re: how no one responds to your posts, how do you think your comment sounds to other people? do you think people would be encouraged to want to help? Or do you think they attract comments like Joe's and my tissue comment?

while its true a question about the benefits of sulfor for cannabis could have been answered with google, nothing wrong with asking here, but some people might see simple questions as a bit of laziness from the asker...

when I visit this forum, I read posts I have posted in and I look at todays new posts, maybe go to page 2 or 3 but never past that, so if your post gets to page 4 of recent posts and I didnt already post in it, I am probably never going to read your post, so instead of complaining that no one answers your question, you could have just said *bump* or just even posted * to get your thread to top of list and get some more eye balls...

life is stressful enough, we really here to help each other grow the one-love right?

also, I read some where that sulfor helps with plants aromas...
This is a pretty good reference for newbies, but it can get confusing because each of the nute companies seem like they have different opinions about what works better.

Newbies are going to certainly have to do some research for themselves since I'm not sure all of these nutrient recommendations are the same for all of the strains.

I know that I've stuck with AN, though some people disagree with their nutrient ratios. I think whatever works for you, works for you.

Good to post this - hope the newbies can find it.

Top Bottom