[weux]

Hello everyone!
Long time lurker posting for the first time.

This isnt quite my first grow, but for the first time ever, i decided to try and give it my best.

My setup:

2x2 tent
3 x GHS Super Lemon Haze
Nebulas manifolding + LST techniques
Nutriculture GT205 NFT hydro
GHE bloom + micro + liquid silicate (basically lucas formula)
DIY led with 4 x Cree CXB 3590, run at 1400mA (meanwell driver)

Plants are about 2 weeks into flowering.
I have slowly risen EC to around 2.1, and it seems to be the sweet spot for now (my girls are very hungry)
PH only tested with color tester, but it has been steady around 6.0 for some time now.
I dont know about temp and humidity, but im sure they are within appropriate range.

Pictures below show my problem.



Im thinking it may be calcium def, but that would be odd since EC is allready so high, and PH should be fine

Another possibility is overfert, but that doesnt quite fit either, since overall color is not darker green than usual. Although ONE time, when EC was around 2.2, one of the plants bottom leaves got dark green, and i immediately diluted my solution, which solved that problem.

Could it be light burn from the leds? Distance from highest plant to leds is around 1 ft, but it used to be maybe 4 in longer, and the problem was allready present.

What do you think?

[Spaventa]

Originally Posted by weux

Plants are about 2 weeks into flowering.
I have slowly risen EC to around 2.1, and it seems to be the sweet spot


What do you think?

Overfed and nutrient locked. Haven't looked at pics but your probably seeing deficiency and burn

[weux]

Originally Posted by Spaventa

Overfed and nutrient locked. Haven't looked at pics but your probably seeing deficiency and burn

Thanks for quick reply.

Do you mean that nutrients get blocked because of the overfeeding, or overfeeding and nutrient blockage as separate instances?

I still think its weird if the problem really is overfeeding, because the leaves are mostly normal color, and plants otherwise seem to like EC at 2.1. It is on the high side tho. 2.2 (ish) was already too much.

[Smoke2much4good]

These plants are about 3 ft tall only been in veg about 2 or 3 weeks is it some kind of stem rot? It's not fuzzy or nothing growing off of them it looks and feels like if a stems peeled off the stalk and it kinda healed itself and hardened back up if you know what I mean what am I dealing with here...

[Spaventa]

Originally Posted by weux

Thanks for quick reply.

Do you mean that nutrients get blocked because of the overfeeding, or overfeeding and nutrient blockage as separate instances?

I still think its weird if the problem really is overfeeding, because the leaves are mostly normal color, and plants otherwise seem to like EC at 2.1. It is on the high side tho. 2.2 (ish) was already too much.

Too much of one nutrient locks out others. Eg. Too much potassium locks out calcium and magnesium and eventually nitrogen. Nitrogen is last to get locked so that why you still have green in your leaves.

2.1 is high for cannabis in hydro and off the chart for the stage your at. You may get to 2.0 for a week or 10 days 3 weeks from finishing.

Heres some guide values. 0.8-1.3 for seedlings; 0.5-1.3 for clones; 1.3-1.7 under vegetative phase; 1.2-2 during flowering.

Smoke2much4good - possibly fungal disease. Even if it isn't, treatment won't harm. Sorry best i got.