What is wrong with my plant?

[dec]

Hello!

I have a 3 weeks old Northern lights under 70w CMH in a PC box.
Temperature 78.8 RH: 47%
Soil: PH 6.2 , 150-300 mg/l N, 200-400 mg/l Phosphate, 150-350mg/l K2O

I only watered my plants with water so far and the leaves are turning crispy brown.

Is it a nute burn or could it be that the leaves are burned because the intense light is bouncing off the car windshield reflector?

Thank you for your help!

 

[BrownThumb]

I will be interested to find out myself since the plant looks healthy. The soil appears dry now, has it ever dried out completely, to the point of wilting?

 

[Galactic]

Re: What is wrong with my plant?

You can rule out nute burn and the reflector. Looks like a phosphorus deficiency to me but your ph seems to be in the right range. Said you fed water, was it ph'd at 6.2 or is that the runoff or soil ph meter?

 

[dec]

Water PH is 7.40 and runoff is 6.30.
I added 1.25ml of Hesi phosphorus plus (8% Phosphorus, 4% Potassium) to 500ml of water and a few chicken manure pellets.

Hope this will be enough to stop the spread of drying leaves.

Thank you very much to both for quick help!

 

[Galactic]

Re: What is wrong with my plant?

Keep an eye towards the newest growth, which the other guy mentioned was looking fine.

The deficiency is a temporary moment on the way to proper development. We visually see "deficiencies" because the plant requires more of a particular nutrient after it already tapped into the ones stored in affected leaves (oldwr, and lower growths).

I like watering in at your desired ph 6.0-6.3 to maintain your range

My best to you

 

[xeno83]

give them a bit of nutes, 1/4 strength with your next feed. Or get a spray bottle and foliar spray them.

 

[Adze]

dec,

You might want to ask yourself why the ph is 7.4 going in and 6.3 coming out. Something is causing the change. I used some peat moss in a starting mix I made once, turned out that the peat moss was very acidic. I was curious what would happen if I put a bit of baking soda directly on the wet peat moss. I could hear it fizzing! Not good, even with the hard water from the tap.

 

[BrownThumb]

dec,

You might want to ask yourself why the ph is 7.4 going in and 6.3 coming out. Something is causing the change. I used some peat moss in a starting mix I made once, turned out that the peat moss was very acidic. I was curious what would happen if I put a bit of baking soda directly on the wet peat moss. I could hear it fizzing! Not good, even with the hard water from the tap.

This is the kind of stuff that made me finally pony up for the tools needed to try passive hydro. Fuxk dirt. Just a simple Hempy set-up blows the crap out of soil and you can make real time adjustments like a minor deity. You cannot affect changes anywhere near that fast in dirt. Nothing worse than growing something for months and then seeing a condition develop that ultimately ruins the batch....and all you can do is try to adjust and watch the plants choke. For this reason, you may want to think about trying liquid feeding in a soil less mixture down the road. Look at my WOS AK Land race grow thread and you will see what i am talking about, I really took it in the rear on my last run because I cut corners on soil and then had to try to adjust mid flower....not good. With Hydro, it would have been cake. I am currently running dirt and Hempy and it's obvious which method is more effective. You can see all of this in my thread and probably a bunch of others before me. I have been converting all of my soil over to Perlite/Vemiculite because my time and peace of mind is valuable to me.

 

[SeaMaiden]

dec,

You might want to ask yourself why the ph is 7.4 going in and 6.3 coming out. Something is causing the change. I used some peat moss in a starting mix I made once, turned out that the peat moss was very acidic. I was curious what would happen if I put a bit of baking soda directly on the wet peat moss. I could hear it fizzing! Not good, even with the hard water from the tap.

Peat moss is always acidic. The fizzing is a natural, expected reaction and once it's done, it's done.

To the OP, I don't know if anyone else here has mentioned it, but IMO you're using too high a pH for feeding and watering to begin with. Drop it down, 6.2-6.8. Don't mess around with run-off for now, just feed in the appropriate range to start.

Also, learn about vapor pressure deficit, and you'll want to bring your RH up afterward. Get it to at least 50%, over is better.

 

[Adze]

SeaMaiden,

Really like your posts, always helpful and knowledgable.

Yes, of course peat moss is always acid. The point was that some peat moss is way more acid than one might expect. I had some difficulty with young seedlings in this mix and thought it might apply here. The soda reaction was just to demonstrate that.