Yellowing on my Auto Ultimate

[gsc]

Hello wonderful guys, I followed a lot this forum reading only and it helped me a lot understanding how to grow.

Now I have some problems and I don't understand how can I fix it. First of all my setup: 2.5x2.5x4 grow tent, mars hydro ts1000 lamp, 4" extractor with carbon filters and passive intake, growing in a 5gal pot with soil (BioBizz LightMix) and fertilizing with BioBizz nutes (BioGrow and BioBloom) and Cal/Mag by Advanced Nutrients.
Currently at week 8, day 53, my plants show what to me seems a nitrogen deficiency (currently using 4ml/L of both Grow and Bloom and 1ml/L of Cal/Mag) but it looks weird that with the nutes I'm giving it shows this deficiency, also because I think there are sign of overferting because of the yellow leaf tip, giving only water this last week (the leaf around the pystils look fine, older leaves and bigger leaves looks lime green or yellow and some of them dried and/or pluck away easily). The plant has never been fertilized before week 4 (my bad) but it never showed deficiencies. It started looking bad after 1week witouth water (I was away). Could you tell me how to fix? The plant is still growing (2,5 inches in the last week) and the colas are getting bigger, so it seems she's doing fine but I would like to receive suggestions from people who knows the game better than me. Ah, I don't ph the water (my plain water should be around 7).

Thank you guys!

Peace!

 

[Proph]

Thats definitely a nitrogen deficiency. The real question is, what is causing it.. My questions to you are, how often do you feed nutrients? Is it every watering, or every other watering? It could be caused by an excess of potassium. Too much potassium will lock out nitrogen. It could also be a ph issue since you are not checking the ph. Your plain water may be around 7.. But once you add nutes, that ph number will get higher, or drop to a lower number. Both of those numbers are very important to know. The plant can take up nitrogen at a ph between around 6.0 and 7.5. If the ph of the soil, or the ph of the nutrient mix is outside of that range, the plant won't be able to take in nitrogen.

 

[gsc]

Exactly, that's what I am trying to figure out. I will check the water+nutes ph, but consider that according to what biobizz says there's no need to balance the ph with their soil. Also, the potassium was added lately in bloom but the plant wasn't recovering. In theory with this nutes the ph should go down, not up. Also, I think I overfed since the tips are yellowing. The lady luckily is still growing well and strong.

 

[gsc]

ah, to answer you I feed with every watering, but last week I just gave plain water, so last 2 waterings were pure water (I usually water every 3 days with 2 liters of water)

 

[Marshydro]

Hello wonderful guys, I followed a lot this forum reading only and it helped me a lot understanding how to grow.

Now I have some problems and I don't understand how can I fix it. First of all my setup: 2.5x2.5x4 grow tent, mars hydro ts1000 lamp, 4" extractor with carbon filters and passive intake, growing in a 5gal pot with soil (BioBizz LightMix) and fertilizing with BioBizz nutes (BioGrow and BioBloom) and Cal/Mag by Advanced Nutrients.
Currently at week 8, day 53, my plants show what to me seems a nitrogen deficiency (currently using 4ml/L of both Grow and Bloom and 1ml/L of Cal/Mag) but it looks weird that with the nutes I'm giving it shows this deficiency, also because I think there are sign of overferting because of the yellow leaf tip, giving only water this last week (the leaf around the pystils look fine, older leaves and bigger leaves looks lime green or yellow and some of them dried and/or pluck away easily). The plant has never been fertilized before week 4 (my bad) but it never showed deficiencies. It started looking bad after 1week witouth water (I was away). Could you tell me how to fix? The plant is still growing (2,5 inches in the last week) and the colas are getting bigger, so it seems she's doing fine but I would like to receive suggestions from people who knows the game better than me. Ah, I don't ph the water (my plain water should be around 7).

Thank you guys!

Peace!

View attachment 1160418

For lighting part, how to use it properly?

Recommended Hanging Distance Above Plants

Seedling: 24'' Germination: 24''-30'' Veg: 18''-24'' Flower: 12''-18''

Recommended Lighting Time

Veg: 18/6(on/off) or 20/4(on/off) Flower: 12/12(on/off)

 

[gsc]

Thats definitely a nitrogen deficiency. The real question is, what is causing it.. My questions to you are, how often do you feed nutrients? Is it every watering, or every other watering? It could be caused by an excess of potassium. Too much potassium will lock out nitrogen. It could also be a ph issue since you are not checking the ph. Your plain water may be around 7.. But once you add nutes, that ph number will get higher, or drop to a lower number. Both of those numbers are very important to know. The plant can take up nitrogen at a ph between around 6.0 and 7.5. If the ph of the soil, or the ph of the nutrient mix is outside of that range, the plant won't be able to take in nitrogen.

so @Proph water ph is 7.6, with nutes is 6.7. Soil ph seems to be 6.74
Actually at 8th weekd and 53rd day I'm giving 3ml bloom 3ml grow and 1ml cal/mag per liter of water (2l total water on 5gal pot)

 

[LazyNhazy]

If you let it get dry enough to droop and yellow like mentioned in first post, the leaves that started to yellow will continue u til gone. Nothing will change that. Also it may just be a normal fade seems to be around the time to do so.

 

[LazyNhazy]

In my experience they tend to drop fans around 50-60 then 3 weeks later it's time to flush and prepare chop. Not saying it's right but works that way for me.

 

[gsc]

@LazyNhazy ok, they definetly drooped because of water lack, but the plant is getting all pale green apart from the top smaller leaves. anyway, as you said, the plant is not looking stunted for me, she keeps growing and getting fat, hope to harvest a nice amount my presivions are for 2ounces, but I hope to harvest more of couse

 

[gsc]

@LazyNhazy I was thinking that I water 2 liters (1/2gal) for a 20L (5 gal) pot. Do you think the plant is getting underwatered?