Leaf Curl

So my leaves are yellowing and curling up. some are curling before being completely yellow. I tested my soil for N and it showed a low level, but they are in week 6 of flower. Is the curling up that's happening just from a severe N shortage?? The P and K levels were high. could this be from lack of Cal/Mag and N shortage. Growing organic, compost tea and great white myco. fed 1/4 strength roots organics nutes at 3 1/2 week flower, and 3/4 strength feed at 4 1/2 weeks flower. Then flushed due to purpling showing up in leaves. now this leaf curling of my fan leaves is happening. Thoughts?

Looks like heat stress.

AfgooCBD said:

Looks like heat stress.

Click to expand...

I thought that maybe it, but my canopy is 81 degrees I the middle at the highest point. plus many of the leaves doing this are in the middle and bottom of the plant.

AfgooCBD said:

Looks like heat stress.

Click to expand...

if say my temps were 80 during day and 80 at night, would not having a slightly cooler temp at night do this?

AfgooCBD said:

Looks like heat stress.

Click to expand...

but this started about 2 weeks ago, and just turned the temps up in the room, was 78 during day and like 62 at night before when this started

Too much light can cause it too, or hot spots. What is your RH? I'd check the ph of your water too. Looks like they are fried. Could be going on with the roots. Is there a doctor in the house??? Don't know if there is anything you can do now. Just figure it out for next time.

AfgooCBD said:

Too much light can cause it too, or hot spots. What is your RH? I'd check the ph of your water too. Looks like they are fried. Could be going on with the roots. Is there a doctor in the house??? Don't know if there is anything you can do now. Just figure it out for next time.

Click to expand...

After looking at the N deficiency in the Garden Saver book, the last picture you can see the leaves rolling over like mine just barely. Plus when I did the NPK test the N wasn't even registering. Im starting to think that its just a major lack of N causing the rolling up.

whats the P K level?

Dr.Pecker said:

whats the P K level?

Click to expand...

The P and K levels were showing a surplus. I just gave them some N, 16-0-0 Earth Juice, 9 tsp in 50 gallons of water, and gave them 1/5 strength cal/mag, 50 mL into 50 gallons water. I think what threw me off was the room was getting down to 60 degrees at night for about 2 weeks cause I didn't notice the AC had gotten turned down for at night. I think that caused my purpling that I originally thought was a P deficiency, then thought since the tests showed a high level of P in the soil that the plants were storing the excess P in the leaves causing the purpling, but now I think it was just from cold night temps. Then the leaves started curling up which im thinking now was just from the N shortage. Sucks that this started at 3 1/2 weeks into flower, and now im 6 1/2 weeks into flower and they have 19 days left roughly cause im gonna chop on the 1st. Im sure this has held my overall yield back for sure, hoping that they will still bulk up nicely these last 2 1/2 weeks.

That's funny that a doctor DID show up! Sorry about your yield. At least you know now for next round.

Cold temps will make it purple. A little bit of yellowing is normal imo. I actually let mine fade on purpose. I think the smoke is smoother. Do you have a tds meter? If your running that much water through them it would be a good idea to test the total dissolved solids. usually when I see leafs smoked like that, the soil has a salt build up.

Too much K can cause a lock out usually it looks like a cal-mag def. Notice any brown spotting or dead spots? (necrosis)?

Dr.Pecker said:

Too much K can cause a lock out usually it looks like a cal-mag def. Notice any brown spotting or dead spots? (necrosis)?

Click to expand...

yeah I have blue lab combo meter. I should've trusted my gut in the beginning because ive now figured out my plants have just been starving for food. I found a podcast with a guy from roots organics that says the 707 soil is made with a third of the nutrients as the original so you can start feeding quicker. I was under the impression the soil could get them a lot farther along. So really I just needed to be feeding them more nutrients to keep up with their needs. I would've been fine if I amended the soil stuff but didn't have the money to do so. Lesson learned. my runoff has been like 300-350 ppm or .3-.4 EC, obviously really low lol. Kicking myself in the ass right now lol, at least that was my small room and I have my big room going now so now I know what to do

300 ppm Isn't bad as long as you don't see a little x10 next to it. I think you should try using full strength nutrients mid veg to mid flower. cal-mag usually has separate dosing for accelerated feeding. I wouldn't cut it back to 1/5 what kind is it?

Dr.Pecker said:

300 ppm Isn't bad as long as you don't see a little x10 next to it. I think you should try using full strength nutrients mid veg to mid flower. cal-mag usually has separate dosing for accelerated feeding. I wouldn't cut it back to 1/5 what kind is it?

Click to expand...

Yeah the plants did fine until week 3 of flower then showed deficiency, and I only veg for 10 days. Probably give 1/2 strength nutes in week 3 of flower, then full strength each week through week 7 and then flush for week 8 and 9. Im pretty sure my water has enough cal/mag as it is. Goes through a sediment filter and a carbon filter and is 150 ppm. Need to get a sample of my water tested to really know how much cal/mag is in there. But I know if you use r.o. water that is 5 ppm or less, you add cal/mag so it goes up to 150ppm, so im hoping its good already. plus I never have run into a calcium or magnesium deficiency yet.

A balanced organic soil shouldn't really need any adjusting. are you 100% organic (soil+nutrients)?

MammothGrow said:

Yeah the plants did fine until week 3 of flower then showed deficiency, and I only veg for 10 days. Probably give 1/2 strength nutes in week 3 of flower, then full strength each week through week 7 and then flush for week 8 and 9. Im pretty sure my water has enough cal/mag as it is. Goes through a sediment filter and a carbon filter and is 150 ppm. Need to get a sample of my water tested to really know how much cal/mag is in there. But I know if you use r.o. water that is 5 ppm or less, you add cal/mag so it goes up to 150ppm, so im hoping its good already. plus I never have run into a calcium or magnesium deficiency yet.

Click to expand...

That's it!(I think) you need to keep feeding a bit of nitrogen the fist few weeks. with your current setup

Like I said before, I like mine to be spent when I harvest. It tastes better.

What I do mammoth is add everything to my soil and just water. no need to flush because all I give it is water aside from a lil sugar and a pk boost once.

Dr.Pecker said:

What I do mammoth is add everything to my soil and just water. no need to flush because all I give it is water aside from a lil sugar and a pk boost once.

Click to expand...

Yeah I couldn't afford all the compost and EWC, alfalfa meal, etc that I wanted to amend the soil with,(have a lot of pots to fill). So im using roots 707 straight out of the bag, and I have all the roots organics nutrients such as Buddha Grow, Buddha Bloom, Trinity, Ancient Amber, HP2, HPK and Extreme Serene. I was just under the impression the soil had a lot more food in it already to be broken down and made available to the plant. But now I know it only has enough to get you to week 3. I actually do have a lot of bags of EWC in my shed so ill probably top dress that at week 2 of flower to provide the extra N they need to get through flowering.