Help with my first grow

[cosmicinfinities]

Hi Guys n Gals

I would really appreciate some help as I am currently growing four Auto flower strains.

RQS Auto Northern Lights
RQS Auto Bluematic
RQS Auto Ameneisia Haze
RQS Auto Royal Kush

Now they all look so good and are around 1 month old, but I am concerned with the "Bluematic" yesterday I noticed some tips off leaves are turning slight yellow and inwards, but all the other plants are fine, they get fed the same amount of nuits & water (They not had nuits for Seven days) and it just seems to be this one plant they are all in Dutch Pro soil and perlite in 15l Air Pots.

They have had two water feedings so far since last Wednesday.

So could it be over watering or nutrient burn or heat stress? I only suggest heat stress as happened earlier in the grow, so I have raised the light a little more as the Bluematic is taller than all the other plants atm

Other notes:

They're being grown in a tent 120, 120, 200 under a 600w HPS (Switched from 600w metal halide earlier this week and plants seem to love it)

Please see photos below and let me know what you think it could be. Pm this is such an awesome site, so much great information.

All photo's are of the Bluematic plant but I will post other pics later.

I have had several suggestions but they have left me rather confused as to what the issue is and how I rectify it.

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[cosmicinfinities]

Here are some more images but this time the northern lights seem to getting the same issues, but my other two girls (Haze and Kush) are fine only difference is they are lot smaller.. I just ordered a pH tester, one for soil and one for water but they will not be here till Friday and I just watered all the plants (without nutrients)

Any ideas people as can't afford to mess this up on my first grow, as I said previously I asked in another area of the forum and was told several different things so would appreciate it if an experienced grower were to drop some knowledge.

Thanks in advance.

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[derek420colorado]

My opinion is overwatering and slight nute burn or a ph issue. I would say getting your PH meter is essential! I can say with almost a 100% certainty that they are over watered. As for the color on the leaves that is either due to too much nutrients or a ph issue, I would lean toward a Ph issue because generally when plants are burned by nutes the leaves curl upward not down. Hope this helps

 

[cosmicinfinities]

OK I do not see it being nuit burn surely all the plants would be suffering?? I mean the smaller plants are not showing any signs and are all fed same amount, nor do I think it's over watered I just watered them all today as they were dry quite far down.. So I guess this just leaves pH but again why would this not be affecting other plants?? Thanks for your reply @derek420colorado

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[derek420colorado]

The leaves curling downward like that is almost always a sign of overwatering in my experience also as far as nute burn goes. All plants are different if grown from seed, phenotypical variance just like human siblings means that each individual plant has different needs and can tolerate different levels of nutes. Especially different strains. I would say Ph is playing a role for sure but unless you let them dry out until you see the leaves start to perk up again I think you will still experience the stunted growth and leaves curling downward. Again this is just my opinion based on what I have observed in the past, it may just be a Ph issue but I would be willing to bet they will perk up if you don't water them for a week(depending on temps) if anyone else has any ideas other than overwatering or pH I would like to hear them as well

 

[Fuggzy]

My opinion is overwatering and slight nute burn or a ph issue. I would say getting your PH meter is essential! I can say with almost a 100% certainty that they are over watered. As for the color on the leaves that is either due to too much nutrients or a ph issue, I would lean toward a Ph issue because generally when plants are burned by nutes the leaves curl upward not down. Hope this helps

I agree with Derek. When growing different genetics together, not all plants will react the same. Some plants are more hardy with nutes, or watering. Even within the same strain you can have a plant that just responds differently. I don't think it looks like overwatering, but either nute burn, or pH issue.

The top leaves here have a claw shape, and in normally a indication of Nitrogen toxicity. It would also explain the tip burns/discoloring. Ph can be a tricky one too, as it an show as many different symtom. A good pen will save a lot of time and guess work.. I'm not familiar with your soil, and you didn't mention nute feeding amounts or brand used, but thats what I think. Good luck bud.

 

[derek420colorado]

Ok I have actually looked a little closer and I think that it may not be overwatering, when overwatering they really "canoe" more I guess. So with that said, I say pH issues. If you have to go to the hardware store and get some litmus paper to give you some kind of idea about what your pH is.

 

[Fuggzy]

Yeah, I would go with Ph unless a brighter mind chimes in. Here is an overwatring example. Most the above plants are still pretty firm looking, and holding most their shape.

Also, Ph is a finicky thing. Unless you are in a supersoil, or using self buffing nutes, it can get really out of control, and amazingly fast. Even the self buffing soil, and nutes have issues at times.

 

[cosmicinfinities]

I really think it's pH I watered earlier and the plants have perked up. Will snap some more pics in a little while, still confused tho lol as others have said it's definitely nitrogen deficiency while others saying it's iron deficiency (On my
first post) And others say pH, heat is not a problem in the tent and is consistent could the older flowers be getting affected by the humidifier?? As they are now going into flowering.

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[cosmicinfinities]

@Fuggzy I am using Dutch Pro Soil with their auto flower (Soft water nuits) and of course perlite. My PH pen will be here Friday.

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