Leaf Tip Curling - 6 Wk Vegetative - Need Help Diagnosing

[1fightingocto]

Two female plants in the sixth week of their vegetative states. Both have the tips of the uppermost leaves curling down. One is experiencing yellowing/drying out of two leaf tips closer to the base. First time growing and unsure of what to do. I suspect there might be a problem with the pH or with nitrogen. Would appreciate any advice!

Plants: 2
Stage: 6th week of vegetative stage
Indoor or Outdoor: Indoor
Soil or Hydro: Soil (Fox Farms). Repotted into 5 gallon pots and fresh soil 3 weeks ago, began adding nutrients 1 week ago from General Organics Go Box. Have mixed the solution according to week 6 recommendations.
Size (Wattage) of Light/How Many: 800W LED that covers 5x5 space
Is it Air Cooled: Fans
Temperature of Room/Cabinet: Temp 75-78 F
PH of Medium or Reservoir: 7.9
Any Pests: No visible signs
How Often are you Watering: Every other day
Type and Strength of Fertilizers used: quarter strength General Organics Go Box (according to 4th week recommendations)
Size or Square Footage of Room: 3x4 tent

 

[1fightingocto]

Re: Leaf Tip Curling, 6 wk vegetative, Need Help Diagnosing

Photo of leaf tip yellowing:

 

[Keir Stama]

Re: Leaf Tip Curling, 6 wk vegetative, Need Help Diagnosing

Welcome. Your ph is too high. You stated that it was 7.9. It needs to be in the 6.0 to 6.3 range going in. You really want to be closer to the 6.0. Do you have a pen meter?

 

[juz420]

PH definitely too high!

 

[1fightingocto]

We've ordered pH Down to attempt to resolve the pH being too high, but does anyone know if what we are seeing is actually symptomatic of the pH being too high? Latest update is that the tips at the top are now yellowing and becoming very dry.

 

[bunkbudz]

We've ordered pH Down to attempt to resolve the pH being too high, but does anyone know if what we are seeing is actually symptomatic of the pH being too high? Latest update is that the tips at the top are now yellowing and becoming very dry.

You definitely need to get the ph under control. It also looks like you may be overwatering, every 2 days in soil might be too much.