Help Please! Things going south quickly .

Specs : Day 17 flower. 3x3 tent, 75-80degrees, 45-60 Rh depending on when I watered. Soil I am using is Roots Organic. 400watts LED, 2x SF2000. Taller Girls are about 12-15 inches from light . Supercropped them down tho to make even with rest of canopy, and lowered light to 80% intensity.

So I did water a bit too much yesterday morning. 2 days after they are still more wet than usual so I know I watered too much , but there’s some strange symptoms . I can’t put my finger on weather it’s nitrogen toxicity, phosphorus deficiency , or calcium deficiency due to possibly too much phosphorus ? I did lower my light intensity because I think light was too strong as well since it seems to be affecting only the taller ones. I was using kelp and molasses every other watering up until flower. Thank you for any help in advance!

These spots showed up in only 2 days?

Eugenios said:

These spots showed up in only 2 days?

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Eugenios said:

These spots showed up in only 2 days?

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Yes, out of knowhere seemingly . There was some brown dried up spots on a few lower fan leaves that came in during veg about a month ago, but thats where that started and stopped. This is brand new . Very quick onset.

PlainfieldPuff said:

Yes, out of knowhere seemingly . There was some brown dried up spots on a few lower fan leaves that came in during veg about a month ago, but thats where that started and stopped. This is brand new . Very quick onset.

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I'm not very experienced but looks like pH fluctuations. What's your pH? Also, prepare your solution one day before watering and let it sit. When I mix my solution, it's at 6.7. I check it again the next day before watering and it's at 6.2 or so. So I pH again to 6.5 - 6.7 and then water my plants. I hope someone more experienced shows up and helps you.

Eugenios said:

I'm not very experienced but looks like pH fluctuations. What's your pH? Also, prepare your solution one day before watering and let it sit. When I mix my solution, it's at 6.7. I check it again the next day before watering and it's at 6.2 or so. So I pH again to 6.5 - 6.7 and then water my plants. I hope someone more experienced shows up and helps you.

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Soil ph is sitting 6.1-6.5 so I don’t think that’s the problem. Im Stumped. I hope so too ! Thanks anyways !

Bump

PlainfieldPuff said:

Soil ph is sitting 6.1-6.5 so I don’t think that’s the problem. Im Stumped. I hope so too ! Thanks anyways !

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The soil pH doesn't really matter much. What you are putting in now this late into flower certainly does pH wise.

Wizzlebiz said:

The soil pH doesn't really matter much. What you are putting in now this late into flower certainly does pH wise.

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Really ? How does it not matter lol . That’s what the roots are living in... and it’s going in 6.5

PlainfieldPuff said:

Really ? How does it not matter lol . That’s what the roots are living in... and it’s going in 6.5

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Soil acts as a buffer
I grow in large quantity and use well water that is 8.1 and i never check ph

A. Looks like nute burn. Roots is an amended coco soil. So what ppm are you feeding? And what are you feeding? And how often?
B. Probably don’t need to ph down your inputs as the roots soils lives at 6 and is hard to bring up. Even with 7.5 - 8 well water like herb mentioned.

overall Let them dry out and then rinse with plain water instead of feeding and go from there.

Wizzlebiz said:

The soil pH doesn't really matter much. What you are putting in now this late into flower certainly does pH wise.

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PH ALWAYS matters...smdh.

Geedoubya said:

PH ALWAYS matters...smdh.

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pH matters of what's going in (meaning the water/food you are giving) Not the soil itself unless the soil is completely out of whack.

Also many soils have pH buffers that make worrying about pH in soil especially during veg a non fucking issue.

Might wanna do some research before coming at me with incomplete information.

GrowRijt said:

A. Looks like nute burn. Roots is an amended coco soil. So what ppm are you feeding? And what are you feeding? And how often?
B. Probably don’t need to ph down your inputs as the roots soils lives at 6 and is hard to bring up. Even with 7.5 - 8 well water like herb mentioned.

overall Let them dry out and then rinse with plain water instead of feeding and go from there.

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Feeding about 1400-1700ppm, so not much I believe . But every 2-3 days . Im not alternating water,feed,water this time around... I didn’t realize Roots Organics was so super charged tbh , I been feeding since about week 3 (oops....)
I actually chose to flush them , took over 15 gallons ph water in each 3gallon to get the runoff down from 800 to 300. I figured that would be sufficient enough , am I wrong ?
I’m going to continue feeding every watering but starting at half strength in a few days when they dry out . Ill slowly increase nutes from 50% to 100% until til 10 days before harvest, at which point I’ll water just ph’d water . I won’t be increasing N, it will stay at 50% til 15 days before harvest . I am also going to start using Beastie Bloomz next feeding, also at 50% , then 100% for 2 weeks.
Thanks for the feedback , unfortunately I didn’t see this til after I did the flush. I was hesitant at first but , I did it early, an hour after lights on, then opened The tent and put all the fans on max and brought another one blowing through the door opening. It dried quicker, down to 48rh from 70Rh after the flush . I put some dry topsoil , my thought behind this is thst it will prevent mold forming on top? also put a few giant yellow sticky traps on a stick into the soil.
The very tall ones I super cropped Down to canopy level, as you can see in the pictures, they are bouncing back and going up pretty quick still ! Thickening up significantly as well. The leaves are praying upwards now . What damage was done was done and the new leaf growth is looking much better. Also lowered the light to 70% down from 80%. Well see what happens tomorrow ! Light off in 30. Temps are lower near 72-76 now, Rh 45-50.

1700 ppm?

about 4 ounces wet

the problem is you are feeding at 2.0-3.0+ EC depending on your conversion factor and burning your plants.
~1.4 EC is a nice sweet spot for me.

Some of those larger leaves look a very dark green which could indicate a nitrogen toxicity. The tips of the other leaves are burnt as well. I'd say you've been going a bit heavy on the nutes which has caused this issue.