Need some help, please!

[swegrow]

Yo! I have got problems with 3 of my autoflowers.

Grown in biobnizz lightmix soil with extreme gardenings mycoz.

Nutes are the biobizz biogrow, biobloom, algamic, activera. Used according to biobizz table but cut down to half strength the last weeks due to spotting a little burnt tips.

Light is LED, 340w total.

Temp is 27-30C, RH 55-70%

I let the pots dry out between watering.

Lightcycle 20/4

3 gal fabric pots for two of them and a 20l bucket for the 3rd. They all sprouted from ground on 7/7 and have been showing pistills for just over 2 weeks.

Yellowing of lower leaves, red veins are showing more and more and some brown spots. Starting at base of plant and moving up. Lower small leaves have been dying and falling off. It starts from the bottom and increases upwards.

I dont have a ph meter (getting one asap) and my theory is that it might be nute block or something due to ph fluctuations. I have my own well and maybe the shifting of the seasons, or the fact that we are surrounded by farmlands and the harvest might have influenced the water? We have not had any rain for maybe a month. In just thinking out loud here since it do look like a nutrient deficiency...

[MagicMike66]

I’d try giving them a good flush with plain PH’d water (once you get that meter)

[Rwise]

What I see is fall! Also if she got to dry, as in she wilted, she went into survival mode and is eating the food from those lower storage tanks. If this is what happened, these leaves will continue to yellow die and fall off. Once she is done with them a gentle tug will remove them stem and all. It is normal in fall for the bigger leaves to be consumed, and some smaller leaves as well.
Edit
There is also a minor Root/PH issue, that was likely because a feeding was off on its PH. Growing without a PH meter is possable, add pelleted sulfur and dolomite to your soil to buffer it.
Red/purple veins can be normal or a potassium shortage, for most it is normal.

[swegrow]

MagicMike - I sure will!

What I see is fall! Also if she got to dry, as in she wilted, she went into survival mode and is eating the food from those lower storage tanks. If this is what happened, these leaves will continue to yellow die and fall off. Once she is done with them a gentle tug will remove them stem and all. It is normal in fall for the bigger leaves to be consumed, and some smaller leaves as well.
Edit
There is also a minor Root/PH issue, that was likely because a feeding was off on its PH. Growing without a PH meter is possable, add pelleted sulfur and dolomite to your soil to buffer it.
Red/purple veins can be normal or a potassium shortage, for most it is normal.

Thanks for the thorough reply! I will check ph as soon as I get my meter and see I things are way off with my tap water.

[swegrow]

Yellow from top to bottom but seems to be producing flower anyway. Strange thing for my unexperienced eyes!