Yellow Leaves - Early Bloom

Hello everyone!

I'm currently on week 13 of my first ever grow and things have gone quite well so far. I have a single plant:

Seed:
White Widow Feminized from Royal Queen Seeds (https://www.royalqueenseeds.com/feminized-cannabis-seeds/122-white-widow.html)
Tent:
Mylar tent measuring 90cm Long, 50cm Wide, 160cm High (0.72m³) Small but all we can have!
Air:
Rhino Hobby 4" Carbon Filter
Black Orchid mixed-flo 4" (Rated @ 187m³/h)
Single, USB-powered, circulation fan
Hydro:
Single DWC Bucket (with an air stone and air ring plus a decent pump. No dripping system or anything fancy)
Clay Pebbles in mesh pot covered with card to block light
Light:
A single 300W Led (KINGBO Dual Optical Lens-Series 300W LED - https://amzn.to/2Uzwe7T)
Light is currently 35cm away (30cm from the highest yellow tip leaf)
Food:
Flora Series / TriPart feed currently at
Using Hydroguard
Logging:
pH 6.0 ( had to test with Litmus paper as my pH meter just died now)
1574 μS/cm (Says 1,4 - 2,2 EC(ms) On Flora Series / TriPart)
Temp: 24°C / 75.3°F (Low: 20°C / 68°F - High: 27.31°C / 81°F)
Humidity 46.6% (Low: 40.9% High: 47.2%)
"Custom" scrog net (didn't go to plan!) with natural hemp twine/string
Small amount of leaves with bug bites that appeared early on and no more have appeared
Schedule:
Light is currently 35cm away (30cm from the highest yellow tip leaf)
8 Weeks Vegetative (18 hours on, 6 hours off)
4 Weeks Bloom (12 hours on, 12 hours off) (Started 19th Oct)
Week 13 Started 16th Nov

Pretty simple setup. I've been having stable pH etc and logging results reasonably well in a journal. Definitely didn't train it right at all but I know how to improve next time! I also think I waited too long to start Blooming in hindsight. I think she was ready a week earlier. Other than that it's been smooth sailing.

I noticed the leaves yellowing slightly so at the last water change I lowered the TriPart from ~2,2EC to ~1.6EC assuming I was looking at nutrient burn. However I seem to getting even more yellow leaves now. Now one of the leaves higher up with a bud forming on the stem has started to turn which concerned me a bit more than the lower ones going.

I have done extensive research on the project and looked into this but I seem to be stuck deciding if I have too much formula or too little. Nutrient burn or lack of nutrients. I suppose I could be completely wrong and it's neither because I'm very much an amateur but either way I'm a bit stuck! If anyone could suggest something to me I would be eternally grateful!

Thank you

(I hope these pictures are OK I'm terrible at picturing the plant. Sorry if they're terrible I can always take more gladly!)

If not Ph problems I would start here...

Possibly even Potassium...

Red Eyed said:

Possibly even Potassium...

How to fix Cannabis Potassium Deficiency (K) Pics & Symptoms

Leaves with a potassium deficiency have yellow, brown, or burnt edges and tips. It may look like nutrient burn, but the leaf margins also turn yellow.

www.growweedeasy.com

Click to expand...

Thank you so much Red Eye I will take a good look at those! Appreciate it a lot

PhillThrottle said:

Thank you so much Red Eye I will take a good look at those! Appreciate it a lot

Click to expand...

Should just need to back off the nitrogen a little and give her bloom nutes as some of her leaves look really dark green. How much are you feeding?

That's a good point actually they are definitely darker than I expected which I didn't even think to check that.

Got it at 1574 EC at the moment so on the low end of the recommended on the bottle. Change water every two weeks. And then just a DWC.

I could check the label on the Tri-Part to figure out exact nutrient numbers I'm adding. It's 1:2:3 form the three formulas.

I wondered if I had too little water on my last refill so plan to have that at a higher level next time. Could that cause a lack of uptake from the roots maybe?

Going to do a flush tomorrow.

Sounds like I'd be best balancing the Tri-Part out to favour Potassium with lower Nitrogen. Or is that a dangerous game?

PhillThrottle said:

That's a good point actually they are definitely darker than I expected which I didn't even think to check that.

Got it at 1574 EC at the moment so on the low end of the recommended on the bottle. Change water every two weeks. And then just a DWC.

I could check the label on the Tri-Part to figure out exact nutrient numbers I'm adding. It's 1:2:3 form the three formulas.

I wondered if I had too little water on my last refill so plan to have that at a higher level next time. Could that cause a lack of uptake from the roots maybe?

Going to do a flush tomorrow.

Sounds like I'd be best balancing the Tri-Part out to favour Potassium with lower Nitrogen. Or is that a dangerous game?

Click to expand...

The Flora series has a chart you can follow to help you know what to feed from week to week. I would empty the res and start a fresh one with new nutrients. Now that she's flowering, she has a less demand of nitrogen and more of a demand for bloom nutrients. P-K....phosphorus and potassium along with calcium and magnesium.