Alot of yellowing in the 4th week of flowering

Hello,
At around the 4th week of flowering, the lower leaves started to yellow. Now, after aprox 6 days, it seems not to stop.
I use a TS1000. Nirvana Bubblelicious feminised. Biobizz soil and nutes. Also, the BioHeaven started to smell like it went bad. IDK if this is normal or not. The thing is, a month ago l broke my PH tester and in a rush, l bought a cheaper one. The yellow Chinese kind. What PH meter do you recommend?

Can anyone tell me if this is normal in any way? I checked and alot of people said that yellowing is normal. But this is new to me. I water around 5 liters every 6-7 days. 3 liters at first and the other 2 after 3-4 days. I water slow. .5-1L, wait 30 mins for the soil to bet wet and then another liter and after 30 minutes or so, the last liter. l wait for the pot to get really light. The leaves are bit droopy. But not too much.

The first 3 photos are from 6 days ago. And the last 3 are from today. The leaves have a little bit of nute burn, but just a little. I use a bit(3/4) under the recommended dosage.

They look really hungry. Feed those girls

Give them a shot of Nitrogen too.

SulPoMag may be helpful, possibly Sulfur deficiency.

Looks like it needs much more potassium, and some nitrogen too. Increase feeding doses to full, especially Bloom nutes. And a little bit of Epsom salts for magnesium wouldn't hurt. And you should water fully until a little bit of runoff, looks thirsty. How big is that pot? I think all 5 liters at once is better, then wait until the pot is light.

BioHeaven should smell like a combination of soy sauce and a pet store, for example soy sauce + food for hamsters and fish.. But if the smell changed since opening then it could've gone bad. They last 1-2 years unopened, and up to 6 months after opening.

Those Chinese ph testers are very unreliable. I suggest get pH colored drops, they're cheap, simple and reliable. Or a €100+ BlueLab pen. There are also those mids that cost 30-50€ but they're hit or miss.

Don't let the pots be bone dry between waterings and fed that poor lady! Good luck!

Airpots is typically used for coco coir. If you have a lot of aeration in the medium you could fed that to runoff daily.

My temps are a bit low. 23 C during the day and 18 Celsius during the night

So the temps were pretty much OK. 26-29 during the day and 18-20 during the night. The PH was the problem. As l got my Bluetooth PH pen. And l was feeding them at 6.9 or so with the cheap ph pen. Never trust a cheap ph pen...
I attach pictures from today for comparison. The color is a healthier dark green. Leaves started to curl up in the last days. IDK why. Could be from the wind or too much water. As l watered every day or every other day to feed them. The same airflow is from the beginning. The ventilator is on the wind setting. All buds started to have brown pistils. Theoretically, l am 3 to 4 weeks away from cutting.

With proper feding and PH control you can keep the leaves green through harvest. The color looks good now, the curling on the leaf edges may be from a wind burn or too much light, do you have a fan blowing on them, what kind of lights and how close are they to the plants?

I have a tower ventilator. It's oscillating and on the wind setting(blowing, stopping, blowing...)
I have a TS1000 100% power at 30 cm distance from the buds.
I stopped feeding 2,5 liters every day. It's strange, l had little or no runnof on 2-2.5 liters daily. I water 300ml on e every 5 minutes. She drinks alot

Why quit feeding? They're gonna need nutes before they're done. Could be the fan causing the leaf issue. I'd also say you've got more than 3-4 weeks until chop.

@Phytoplankton why do you say that pls? She is in week 6 of flowering

That plant is far from done.
It doesn’t matter what “ week “ you say it’s in.
To the plant - it doesn’t follow your calendar or breeder timeframe - it will actually finish however long it takes.

Maturing trykes and almost no new (white) pistils work here. Not even close.

Brittania said:

@Phytoplankton why do you say that pls? She is in week 6 of flowering

Click to expand...

First, as said, plants don' use calendars, they look like they're still building buds, I don't see any red/brown pistils, and the buds have not even begun to swell. If you're going by what the breeder says, throw that timetable out the window, never seen a plant that was done in the time a breeder said it would be.

I would bet it is nitrogen. Anything else will create more problems.