Guide to Nutrient Deficiency or Toxicity

Is there any way to tell the difference between cal/mag deficiencies and toxicities?

Colorado_White_Wash said:

Is there any way to tell the difference between cal/mag deficiencies and toxicities?

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Couldn't tell you. I always throw a scoopful of Epsom salt (aka magnesium sulfate) in the Heisenberg tea I make using RO water. The new shoots coming out of the tops of my clones aren't as yellow green anymore and the yellow on some of the leaves is disappearing. Hope you find an answer here.

Okay, so instead of starting a thread I thought I'd try here first. I know people talk about N tox/def or P and K def a LOT, but I've got a question about P and K tox. This happened using FF Big Bloom on an afternoon where I took a few Xanax and I guess wasn't thinking clearly (not a normal thing for me, and I could kick my own ass).

I'm pretty sure I mixed up the mixture the way I intended (it was mixed up on a different day than the mistake was made). I had 3 tblsp Big Bloom in 3L water. Anyways the first thing I noticed was the ones affected were all very droopy. This was 24 hours later. 48 hours later it was even a little worse. I was a bit stumped (although immediately attributed it to something I did the day before because I didn't remember a lot of things 100% clearly).

What happened was I just gave them way too much. I tested the soil and the P and K was off the charts. Now, I've read from Jorge C that when this happens you can and will depending on how much you gave them, run into problems with magnesium, calcium, iron, zinc, and even manganese being deficient and now I'm noticing signs of that reddish rusty looking pattern starting on the edges of leaves and now on some of the older fan leaves had spread through the whole leaf in spots. Everything is still droopy. Before I knew what I thought was wrong all I knew to do was to flush them and I did so very well, twice. This didn't fix things and now I think at least one of them is probably going to die, one has come back pretty well, two remain pretty consistently bad, and then there's two that are still bad, but much better than the rest IMO.

Mind you, if this was everything I'd be really really upset. I have others that are doing quite well and some that have now surpassed these in growth that started much later than them and are looking great. I had two others that are pretty healthy that I wanted to flower a while back and was waiting on these six because they should have been ready by now. I've taken them all out of tent and am about to just start flowering what's ready and moving the others in as they're ready (if I can get some of these older ones to that point).

Okay, so seeing the Redding of the leaves I'm thinking calcium def or magnesium def. I'm new, so excuse me if any of this sounds way off. Now what I want to ask is, if you were in this situation what would you do to correct it the best you could, in order from first to last. I've waited longer than I should have to make try to make this right so maybe I'm too late and they're just going to go more and more downhill, but there's been a lot of other things going on as well so if they do then so be it. I do love em though, so if I can fix it at this point I'll do whatever I can. Let me know if you've seen this before or know how to fix it. If not and you're still a very experienced cultivator, chime in with what you'd do anyways please if you know and have a minute

Well written articles, I could not get the attachments to come up though. I get getting an error message showing up.

nick17gar said:

yea this info is on here already, some of it is scattered around. some of the info i got from other grow sites.

half the reason i wrote this was to compile it all onto 1 page for personal reference haha.

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Thank you for this post everything all in one place awesome thread thank you again

Is this nitrogen deficiency? I'm not too sure how well you can see it but to describe it I'd say it's little yellow speckles

These are pictures of the same plant. Kandy Kush. This is the worst one in my friends garden. One of the pics is under CFL lights and the other pic is under a regular incandescent. I don't know if this is a burn or a deficiency. I'm in early veg. I believe whatever happened could be partly due to me overwatering. The other problem may be due to my ph being too low. I've been PH'ing from between 5.5-5.9, when i should be pH'ing between 6.0-6.5. I am going to change both of these problems. Please diagnose.

Can anyone help a poor ol noob, thanks

I've been having a root rot problem and it started looking like this last week I'd check that out. My baby looked like it was doing great then all of a sudden it started wilting but the dark spots were noticed first.

Is there anything to do against root rot?

Hydroguard is supposed to work pretty good I'm treating mine with it now plus cleaned hydro system with bleach rinsed well and changed water also I've recently learned if water temp is kept at 68 or lower it helps more oxygen stay in water and helps promote disease free water as bacteria breeds in warmer water. From what I understand roots that are damaged cannot be fixed but new healthy roots can continue to grow. At first it looked like I had a mag def. but it turned out to be root rot. This is my first experience with root rot I've been reading all I can on subject and trying known fixes I'll keep posting as to my success or failure to see if I was successful

Awesome, im going to start looking into it right now, thank you

Árboles verdes said:

Is there anything to do against root rot?

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http://www.skunklabshc.com/shop.html
i use this line up with the tea complete no more root rot in my dwc your setup must be right no lite coming in right amount of air bubbles
i'v used hydograurd ,H202, dutch master zone, Physan 20....with no luck comes back
Good Luck fighting that...

I'll keep that in mind I've seen good reviews for hydroguard so I tried it yesterday I'm thinking it'll be about a week till I see any results if no luck then I'll just start again from scratch. I've had great success in past growing my ladies in hydro and in garden soil but no luck with soil in pots so I'm going to stick with hydro for now. If again no luck then I'll have to rethink my options. Now if it was legal in Ohio I wouldn't have to try so hard I'd have options but alass these ppl in Ohio can't think or vote for themselves sorry got off subject just pisses me off that it was voted down bunch of idiots.
Well I'll still be growing luckily I had a hellava yield this year so I've got my own supply for now of quality buds. But it won't last long so I'll keep at it.
Hopefully my clones will survive and flourish.

Im using soil, im either watering too much or didnt use the right amout of nutes?

Could be. If anything use less nutes. It's too easy to over fertilize. Maybe let soil dry out first then flush with ph'd water in soil ph should be between 6.0-6.5. As soon as my problem started my ph would fluctuate up to 6.5 in hydro I try to keep it as close to 5.7 as poss. Overwatering seems to be my biggest problem every time I grow in soil. Good luck to you. I love growing weed .com has a great download book for plant care I'd check it out if you haven't yet. I'll try to find link for you.

I'm no expert just trying to help with info I've read or learned from other members on this site great place for answers

I love growing marijuana.com-plantcare-guide

Try this link to download also while there download the grow bible too lots of great info especially for soil

Sorry full site is I love growing marijuana . com

IGLM.com

Its cool, information about weed is always welcome, thanks for the info.