Yellowing and curling

It is my second attempt at indoor growing; I managed to kill 9/10 white widow seedlings about a month ago when I made a series of critical mistakes... My problem now is that I've gotten my seedlings to about 3 weeks old. Some look wonderful and are getting 4th or 5th set of leaves .... One or two plants however are starting to yellow at the bottom and their leaves are starting to curl under. All my research on this site and others would suggest a nitrogen deficiency (I think) however I have watered/fed all the plants the same amounts and some are thriving! I have attached two pictures; one of a healthy plant and one of the sick one. I have still been only using 1/4 strength of the feed bc I was concerned I would burn them. What should I do?
Ps. Plants are in coco and approx 3 weeks old. I am feeding 1:1:1 tsp of GH 3 bottle system approx every second day/third day depending on how dry they are. They are 2 feet under a 600w mh light . Humidify constant around 60%, temps between 72-81 degrees and a 18:6 light cycle
Thanks

where do you get your water from?

What is your ph of your feed? Are you getting some cal/mag in there? Looks dry. Do you foliar spray? The yellowing shows a Nitrogen def.

Poopfacetomatonose said:

It is my second attempt at indoor growing; I managed to kill 9/10 white widow seedlings about a month ago when I made a series of critical mistakes... My problem now is that I've gotten my seedlings to about 3 weeks old. Some look wonderful and are getting 4th or 5th set of leaves .... One or two plants however are starting to yellow at the bottom and their leaves are starting to curl under. All my research on this site and others would suggest a nitrogen deficiency (I think) however I have watered/fed all the plants the same amounts and some are thriving! I have attached two pictures; one of a healthy plant and one of the sick one. I have still been only using 1/4 strength of the feed bc I was concerned I would burn them. What should I do?
Ps. Plants are in coco and approx 3 weeks old. I am feeding 1:1:1 tsp of GH 3 bottle system approx every second day/third day depending on how dry they are. They are 2 feet under a 600w mh light . Humidify constant around 60%, temps between 72-81 degrees and a 18:6 light cycle
Thanks

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Don't try to push seedings too fast . Check your roots for good healthy growth, then cut your fert in half for a couple weeks, also make sure your ph doesn't drift out of the 5.3-6.0 range. It looks to me like fert is building up in your coco. Peace

I was watering with distilled water when they were seedlings. I use well water now. Ph is generally 5.0 to 6.3 or so, and Ppm is very low around 15. Yes I have also been using calmag... By foliar spray do you mean spraying water on the leaves? I never do that.

I would get your ppms to the 300-500 range and try to get something with a little more nitrogen in it, than your phosphorous and potassium.

As stated above..your final PPM should be around 3-400 at this stage so they definitely need a little more nutes. Although I would calibrate your PPM pen. Well water alone should be greater than 15 ppm.

The worst you can do is over water them. Coco can hold water for quite a while I would STRONGLY suggest you mix in perlite when you repot them. At least 25% perlite.

Lastly, don't panic. Lots of time the lower leaves yellow and fall off on seedlings. There is a delicate balance when pkants are young between the amount of developed roots and the nutrient requirements of the plants. If you have strong lights, or they are too close, that is all that is needed to make the plants canabalize nutrients from lower plant tissues.

My only other advice..don't repot them until some roots are circling on the bottom of the existing pot. Newbs are always throwing 6" seedlings in huge pots.

Cheers

Thank you all for taking the time to reply Im so glad to have your expertise. Just to clarify I have always ph'd the water to 5.5-6.5 but really try to hover around 5.8 as I had read that it was optimal. I hadn't really bothered with the ppm readings thinking that as long as I had the proper ph balance and dosage I was fine but I guess it's just another mistake/learning opportunity...warble and legally flying - so just to clarify should I be upping the nutes until I reach the proper ppm even if this is higher than the gh feed schedule? Should I use my tap water that will have a higher mineral content rather than what is essentially rain water?

Also I have about 30-40 percent perlite mixed in. All the coco was flushed multiple times before use and precharged with cal mag only..i started in solo cups and they were recently transplanted to their larger pots when I saw roots coming out the drainage holes. I did put them in much larger pots, perhaps too large, should I transplant them down again or just leave well enough alone?

Chubby 44 if my fert has built up is there any value in a flush or should I just ride it out? I'm also curious if you subscribe to the feed every watering belief or if I should be doing something like feed-water-feed or feed-feed-water?

I may also have my 600 too close to my plants...the back of the hand test seems to show that the heat isn't too high tho...

Sorry for all the questions I thought I had read until my eyes were bleeding but there are so many differing opinions and ways that people have to grow successfully....hopefully I can find mine...

Thanks for your patience with the newb

From a well. Rain water runs into it via eaves.

You don't have fert build up, you don't have ANY fert.

For what it's worth, most experienced growers don't even read the nutrient feed charts. I know that I dont.

100-200 seedlings
3-500 young plants less than 12"
700 for mediums and 1k for anything larger than about 18"

Max flowering strength is 1500 in week 4-5.

Poopfacetomatonose said:

It is my second managed to kill 9/10 white widow seedlings about a month ago when I made a series of critical mistakes... My problem now is that I've gotten my seedlings to about 3 weeks old. Some look wonderful and are getting 4th or 5th set of leaves .... One or two plants however are starting to yellow at the bottom and their leaves are starting to curl under. All my research on this site and others would suggest a nitrogen deficiency (I think) however I have watered/fed all the plants the same amounts and some are thriving! I have attached two pictures; one of a healthy plant and one of the sick one. I have still been only using 1/4 strength of the feed bc I was concerned I would burn them. What should I do?
Ps. Plants are in coco and approx 3 weeks old. I am feeding 1:1:1 tsp of GH 3 bottle system approx every second day/third day depending on how dry they are. They are 2 feet under a 600w mh light . Humidify constant around 60%, temps between 72-81 degrees and a 18:6 light cycle
Thanks

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Thems babies u only give them water till they get about 5th nothes. And they usually fall of anyways and
them babies only water for them

how close did you have your 600? they could be getting bleached out by the light like you said.

chubby44 said:

Don't try to push seedings too fast . Check your roots for good healthy growth, then cut your fert in half for a couple weeks, also make sure your ph doesn't drift out of the 5.3-6.0 range. It looks to me like fert is building up in your coco. Peace

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Should I try to flush it then?

legallyflying said:

You don't have fert build up, you don't have ANY fert.

For what it's worth, most experienced growers don't even read the nutrient feed charts. I know that I dont.

100-200 seedlings
3-500 young plants less than 12"
700 for mediums and 1k for anything larger than about 18"

Max flowering strength is 1500 in week 4-5.

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Thanks for this advice. I'll try this ASAP and let you know how they progress.

Alienwidow said:

how close did you have your 600? they could be getting bleached out by the light like you said.

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About 22-24". My previous mistakes unfortunately scared me into making new and entirely different mistakes on my second attempt with seedlings. I moved the light further away last night and they look a bit happier...I've made so many mistakes it's hard to tell which mistake caused which problem...I have a new respect for all you growers it wasn't nearly as easy as I originally thought....much thanks

Poopfacetomatonose said:

About 22-24". My previous mistakes unfortunately scared me into making new and entirely different mistakes on my second attempt with seedlings. I moved the light further away last night and they look a bit happier...I've made so many mistakes it's hard to tell which mistake caused which problem...I have a new respect for all you growers it wasn't nearly as easy as I originally thought....much thanks

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theres your problem. your frying them. thats like two of my shoes away from a sprout. a sprout needs like 30 watts at appropriate height. your giving it what a flowering large plant needs at appropriate height. a smart guy once told me, raise your lights up to the final projected height and let the plants grow to the light. don't keep moving the damn light as the plant grows. gettem up and keep em up. one of the most common problems with new growers along with over watering is too much light.

Alienwidow said:

theres your problem. your frying them. thats like two of my shoes away from a sprout. a sprout needs like 30 watts at appropriate height. your giving it what a flowering large plant needs at appropriate height. a smart guy once told me, raise your lights up to the final projected height and let the plants grow to the light. don't keep moving the damn light as the plant grows. gettem up and keep em up. one of the most common problems with new growers along with over watering is too much light.

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G

Alienwidow said:

theres your problem. your frying them. thats like two of my shoes away from a sprout. a sprout needs like 30 watts at appropriate height. your giving it what a flowering large plant needs at appropriate height. a smart guy once told me, raise your lights up to the final projected height and let the plants grow to the light. don't keep moving the damn light as the plant grows. gettem up and keep em up. one of the most common problems with new growers along with over watering is too much light.

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Good advice. They look relieved...as am I. Thank you.

Poopfacetomatonose said:

G

Good advice. They look relieved...as am I. Thank you.

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no prob, i like to use fluorescent lights at that age because they're way cheaper to run and you don't need a/c and all that other jazz yet.

You know that "balance" I was talking about between ability to uptake and need for nutrients...that is why they are a little yellow. Lots of light..not a lot of roots yet.

Once they get about a foot tall however..its game on with the light. I would say about 12-18" away during veg, probably the same in flower. You want about 40k lux during veg and around 80-90k lux during flower.

Closer than 12 with a 600 and you will lose some quality but gain more weight.

And about that "yeah man, just raise the light to its final height and let then grow to it... Sorry bud, but that is some pretty fucking stupid advice.

Not going to get into a debate about as really, I could give a fuck less, but that isn't how it's done

legallyflying said:

You know that "balance" I was talking about between ability to uptake and need for nutrients...that is why they are a little yellow. Lots of light..not a lot of roots yet.

Once they get about a foot tall however..its game on with the light. I would say about 12-18" away during veg, probably the same in flower. You want about 40k lux during veg and around 80-90k lux during flower.

Closer than 12 with a 600 and you will lose some quality but gain more weight.

And about that "yeah man, just raise the light to its final height and let then grow to it... Sorry bud, but that is some pretty fucking stupid advice.

Not going to get into a debate about as really, I could give a fuck less, but that isn't how it's done

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well we aren't all blessed enough to own a lux meter. pretty stupid advice? well you just changed your answer to my conclusion so enjoy my stupid advice. the rationality behind my statement is that the plant doesn't need 600 watts beaming into its face right now at two feet away. that light could be five feet away and that plant will be fine. so then it has five feet to grow into the light, which it would do just fine. i run my 1000 watt double ended lights at three feet away from the canopy and pull almost 2 lbs a light. and i never move the fucking things lol. they are attached to the ceiling by anchors. it would take way to much maintenance moving all those every three days as the canopy moves in the first three weeks of flower. just listen to me op, get that light three or more feet away from that sprout and hopefully she gets her color back. and if you want buy a lux meter and spend your time making sure the light is the exact amount of inches away or worry about other things with your time like learning how to pull 6 wet pounds per light.

really to early to discuss this give your pklant a few more weeks - remember once you see a plant issue you are all ready 2 weeks behind in fixing it. Generally "flushing" or just "leave alone" for a bit to see if issue continues - flushing is your first line of defense. generally early plant issues are a simple fix Can be a light issue (distance from plant or overfeeding (should wait untill at least 2 weeks before feeding, just use a root stimulator in first 2 weeks of growth