N Tox or Bloom Feed?

[nughuffer42]

Hi All! New to growing autos and AFN but have used this site to get up and running this far. That being said, I am struggling a bit with the following dilemma and would love everyone's input.

-Problem: Appears to be some N tox with the curling but there are also yellow leaf tips. Could this be nutrient burn or hunger setting in? The curling I'm assuming is N tox and not overwatering but I also don't want to underfeed right as flowering is beginning. I was debating if I should hit these with tap water or bring in a small dose of bloom feed?

-Medium/grow method: Foxfarm Happy Frog
-Feed/Nutrients: Biobizz line. Began feeding only 0.5mL of BioHeaven at Day 18 and then 0.5mL of BioHeaven and BioGrow from day 18 until now. Was this early even for such a small amount of BioGrow? I wanted to try and trend them up a bit. I have a high plant density in this tent as I underestimated the reliability of the germ rates on these beans.

-Water source: Declorinated tap

-Strain and age: Ripley's OG and Orange Diesel (Mephisto Genetics)

-Climate: Day temps around 82, drops to low 70s at night. RH stays in the mid 50s with a quick spike when the lights go out before venting.

- Light used: 400 wt. Timber COB led, 18/6 cycle.

-Additional info: This seemed to set in after day 20 when BioGrow came in but again I thought as such a low dose I would be safe. With flowering beginning should I switch to BioBloom slowly or give them a tap irrigation to try and offset this issue? I don't want to slow them down as they enter flower!

Thank you all!!!!!!

 

[namvet25]

She looks plenty green so maybe back off nutes and just use plain ph,d water for awhile and see if that leaf curling stops.Make sure you use cal/mag also.

 

[AutoLowRyder]

drops to low 70s at night.

that is too low for lights off, your soil temp is to low also, the yellowing leaf tip confirms this, could be that that one plant has a low nute tolerance, and has shown tip burn at low feed Ec's............... but i would bet the soil temp being low has dropped the grow medium Ph leading to the beginnings of a phos lock out.as chart, make sure you feed water is at 22-33c................fed to a root matrix at 23-24c.................... allow roots to dry out once a week to allow oxygen and co2 ingress,.....................if you use fish tank water de chlorination, it wont help the soil at all, better to blow off chlorine from tap water and aerate with oxygen via a air stone and air pump...................... add hot kettle to bring up to root temp, aerate it, then add hot water to 23c then add nutes and feed fresh after Ph'ing to 6.5........................if you have an Ec meter / pen. do not exceed Ec 1.2 as a max feed power, staret seedlings at Ec 0.3 and work up..............ALR

 

[Jimbojohn]

In addition to ALR's post - consider transitioning your 18/6 light cycle to 24/0 as you move into flower. This will eliminate temperature and RH swings.

You need to get your ambient room temperature up - this is critical to ensure both leaf surface and root zone temperatures are allowing the plant to maximize photosynthesis and nutrient uptake.

A decent read here -
https://www.maximumyield.com/the-re...face-temperature-and-lighting-spectrum/2/3226

 

[Jimbojohn]

BTW, is that 9 in a 3x3?

 

[nughuffer42]

BTW, is that 9 in a 3x3?

That's a good call I will switch over to 24/0 to maintain the tents and humidity as well as root zone temps. Yes they are crammed in there I didn't expect such good germ rates!

 

[Jimbojohn]

That's a good call I will switch over to 24/0 to maintain the tents and humidity as well as root zone temps. Yes they are crammed in there I didn't expect such good germ rates!

I'm all about maximizing return on space.
Currently running 6 in a 2x4, at about 4 weeks today.

https://www.autoflower.org/threads/...ff-super-cali-haze.70375/page-10#post-2081630

 

[Waira]

... N-tox' for sure,... switch to bloom nutes, ease into it too,... nothing to do about the symptoms, just lessen the N inputs,... are you using any Ca-Mg products, and do you see an NKP nuber set on it? Most of them are in aprt, nitrate based, so there's a "hidden" source of N there,....