Deficiency or nutrient burn? confused..

i have 3 different strains in veg right now, great white shark/mazar, pineapple skunk, and sour diesel. Im using the main fox farms trio. Ive only been feeding them grow big at about 1 tsp per gallon whenever they need water this is what i give them, so im feeding with every watering but at or below the recommended concentration. I think the recommended is 2 tsp per gallon. Im confused though because over the past 3 weeks they have been showing signs of Nitrogen deficiency by yellowing and at the same time some of the leaves are turning REALLY yellow and dying, mainly the lower fan leaves. Also there is some signs that look like nute burn like brown spots and just leaves turning dark brown/black on the edge sometimes. so what should i do? I tried flushing them about 2 weeks ago and didnt really notice a comeback or a solution to the problem. I flushed and fed water for a week or so. Then last week i fed them and in 24 hours they grew alot so it was like they needed it.

Usually i let my plants tell me what they need, but i havnt grown in a few years and these are all new strains to me so i dont know what to make of it. They are sending me mixed signals..

looks like they should be able to handle the 2tsp per gallon

It is a nitrogen deficiency. Looks at the end you corrected it but remember in soil deficiencies take longer way longer to fix versus if your plants were in hydro. Whenever I get deficiencies and my medium is soil as well I foliar feed it corrects deficiencies way faster just dont over due if you choose to go that route.

Yep, hungry man.
Try doing a water, water, feed schedule one time, since you already fed once, and see if the yellowing and spotting doesn't stop.
It won't heal, or disappear, but new growth should not have it, and it should not progress to other leaves.

Why is there spotting though? As far as i know and from everything ive read that is consistent with overfeeding.. Also noticed the plants have very red/purple stems. Can i mix a little big bloom or flower nutes to help out with that? I know it has some trace nutrients in it.

I think that is NOT a nitrogen defeciency. Although it does show the general PATTERN of nitrogen deficiency, starts at the bottom and works its way up, ti doesn't follow the specifics for N deficiency. When there is an N problem the entire leaf will fade evenly and then turn yellow evenly and eventually fall off. Your leaves appear to be yellowing unevenly and to some extent, interveinaly. Also, necrotic spots and splotches are NOT due to nitrogen toxicity or lack of nitrogen.

I would bet my bottom dollar what you have there is the begining of a magnasium deficiency. The leaves turn yellow unevenly, develop splotches, and then the edges of the yellowist leaves will crisp out in really bad cases. It starts on the bottom of the plant and moves its way up. Mix a solution with epsom salts. Can't rember the ratio right now but you should be able to find it. Should clear up in about a week in soil.

legallyflying said:

I think that is NOT a nitrogen defeciency. Although it does show the general PATTERN of nitrogen deficiency, starts at the bottom and works its way up, ti doesn't follow the specifics for N deficiency. When there is an N problem the entire leaf will fade evenly and then turn yellow evenly and eventually fall off. Your leaves appear to be yellowing unevenly and to some extent, interveinaly. Also, necrotic spots and splotches are NOT due to nitrogen toxicity or lack of nitrogen.

I would bet my bottom dollar what you have there is the begining of a magnasium deficiency. The leaves turn yellow unevenly, develop splotches, and then the edges of the yellowist leaves will crisp out in really bad cases. It starts on the bottom of the plant and moves its way up. Mix a solution with epsom salts. Can't rember the ratio right now but you should be able to find it. Should clear up in about a week in soil.

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i knew the purple stem usually was a good sign for magnesium deficiency but didnt know the rest thanks. And thats what i thought, why would there be burn spots if it was an N deficiency. So what do i do now.. i dont have epsom salt and dont really want to mess with that it sounds iffy and unreliable. The grow big says it has 0.60% water soluble magnesium

Potassium deficiency?

hsfkush said:

Potassium deficiency?

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I appreciate the attempt to help but posting an answer as a question with nothing to say about it doesnt really help me or anyone thanks though.

Anyways i just went to the store and got some epsom alt ill let you all know how it turns out.

deficiency

Sounds good. Please provide an update. The purple stems thing CAN be a sign of deficiency but it really isnt a very reliable one. Some phenos just have purple stems...

Good luck.

legallyflying said:

Sounds good. Please provide an update. The purple stems thing CAN be a sign of deficiency but it really isnt a very reliable one. Some phenos just have purple stems...

Good luck.

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Yeah i know, the only reason i mentioned it is because i have 3 complete different strains all on the same feeding schedule at the same stages and all of them have purple stems. Oh and thanks for your help, you have been by far the most helpful. +rep and also i love the signature, its refreshing to see someone without one of those disclaimer signatures that wouldn't help in the first place if they were under investigation lol.

Hey ,it's hard to tell but heres a few q's

Have you tested your run off ph? If your ph has dropped too low it will lock out several nutrients and you will get the necrotic spot /def thing going on.

Are you over watering? are you making sure your soil is good and dry between each watering? Overwatered soil ,will starve the roots of oxygen and you will get a yellow ,pale ,sick looking plant

My guess is its low ph lockout ,because it doesn't look like just a n def

Also the lower yellow leaf ,i would yank those leaves off as soon as they are half yellow ,letting them just stay on the plant is liable to bring some rot into the equation ,the brown spots in the middle kind of look like rot to me ,although i wouldnt know for sure because i take dying leaves off much earlier..

purple stems is a genetic thing ,my sharksbreath i got right now started with purple stems and it is lush .

from what ive heard testing the ph of run off tells you almost nothing. and i let soil dry out between waterings

Well ,belive it or not ,up to you, but from personal experience ,i had a sick plant 1 time and couldnt work out what was wrong ,so i tested the run off ph and it was like 4.5.I was using too acidic soil.It wont tell you exactly the ph of the soil inside,but if you have an acidity problem the water you put in will come out the other side considerably lower.

puffdatchronic said:

Well ,belive it or not ,up to you, but from personal experience ,i had a sick plant 1 time and couldnt work out what was wrong ,so i tested the run off ph and it was like 4.5.I was using too acidic soil.It wont tell you exactly the ph of the soil inside,but if you have an acidity problem the water you put in will come out the other side considerably lower.

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i made a mixture of 1 TBSP of epsom salt per gallon and watered them. I will give it a few days but im also taking into consideration this is most likely a ph issue. I have a ph meter. Soil ph should be between 6.2-7.0 correct? My water out of the tap is about 7.2 and my current nutrient solution is 6.5 im also going to take a soil sample and ill mix it with water and let you know what it reads in a few hours.

soil ph is at about 7.1 so im not sure what the problem is if this epsom salt doesnt help i will officially have no idea wtf is going on

yeh that sounds ok ,7.1 is maybe a little high but idk some strains are just so sensitive and like to make life difficult

plantz said:

soil ph is at about 7.1 so im not sure what the problem is if this epsom salt doesnt help i will officially have no idea wtf is going on

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7.1 is way too high in my opinion. Epsom salt will only make it worse as it is quite alkaline.

To me it looks like certain nutrients are being locked out due to the high pH.