nutrient toxicity and drooping recovery, CONFUSED PLEASE HELP

[Bom Shiva]

Im a new grower, first grow i ever did i used an all in one fert and it went great, this time around i have a hydroponics rail setup and was using a 3 part nutrient line, but i way over did it and caused nutrient lock and burned the girls, im going to switch back to an all in one nutrient but in the mean time i have been flushing like crazy and im having mixed results, the res has only pure RO water and nothing els and it has been PHed to 5.5 - 5.8, when the lights turn on i can see they have perkerd up very well over night, but as time passes and the lights are on, by the end of the day they are extreemy whilted agin! The only signs of a good recovery i am seeing is the color changing back to a nice lime green and the stems turning back to green from red. What am i doing wrong? Why do hey begin to whilt agin in the light? When can i begin to bring the nutrients back up?

 

[az2000]

i'm going to switch back to an all in one nutrient

Someone experienced with hydro will answer your questions. But, I don't think 3-part versus 1-part was your problem. Do you use a TDS/ppm meter?

Photos would help. Especially morning/evening to show the difference. Sounds like heat or light stress?

Do you use a silica product? I think it toughens plants, makes them more tolerant of heat, cold, drought, pests.

 

[Bom Shiva]

I just added photos, refresh page, photos of when lights turn on and after they have been on for about 8hrs or so, and close ups of whilting, yes i have tds, its pure RO water the ppm is like 6 lol

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I cant find any info on this problem, every tutorial or reply i get all tell me that after flushing the problem should subside but its only getting worse, the PH is stable, the PPMs are practicly non existant, if the water were any cleaner it would be medical/labritory purity, the res has been cleaned spotless and rinsed with RO water, the only thing i can see that is directly affecting the plants is the light!? How is over exposure to light possible with a C3 plant like cannabis?? This makes no sense

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The temps, humidity, all optimal

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After reading this: http://www.growery.org/forums/showflat.php/Number/388734

I am assuming its light stress?? ive heard of heat stress but light stress is new to me, considering cannabis can go with 24hr light, im guessing the stress from overfeeding weakened its abilitys of photosenthasis?

 

[az2000]

How is over exposure to light possible with a C3 plant like cannabis??

I was thinking about being too close to the light. Seeing photos, it looks like overwatering. I don't know how that works with hydro. Do you aerate the water?

What was the ppm of your water with nutrients. Just curious because it sounded like you blamed the 3-part nutes.

Hopefully someone with hydro experience will take it from here. I just wanted to get some basic (to me) variables out of the way.

EDIT: I don't think it's light stress. Yours don't have the cupped edges. But, it does seem suspicious that it gets worse with lights on. Does anything else happen during lights on, like the water flow?

 

[Bom Shiva]

Water is on a timer, runs day and night, water is highly airated with a comercial pump, theres no such thing as overwintering as long as the water has oxygen, the ebb and flow just allows for the roots to dry out a little and then rehydrate, the plants enjoy thos dry out and resoak, it also help fight root rot issues in an ebb and flow, i can also use it as an NFT by adjusting the flow of water

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The ppms were like up in the 400s i way over did it, in the past i only had a single nutrient, i now have alot of the AN line, i was mixing too many things

 

[GoAuto6]

do you recheck your ph after you add nutrients to the res?

 

[Bom Shiva]

do you recheck your ph after you add nutrients to the res?

Yes, i do, i simply over fertilized, there are no nutes in the res now, how long should i continue this flush?

 

[n00b]

That looks more like the roots are suffocating from lack of oxygen. Are the roots nice and thick and white? I did something similar to tomatoes once...I fed them nutes before the roots were strong enough and actually burned them. The roots turned brown and took two weeks to grow new ones, all the while the leaves just looked very wilted like yours. Can we see a root pic?

 

[Muddy]

In order to make a good diagnosis we need more information. I can see you are running HPS, what wattage and how close to the plants. What is the room temperature and humidity level? What is the temperature of your res? A cal/mag supplement is needed when running RO water. Are you adding some? If so, how much? You also need to get some nutrients in the system. Straight RO contains no nutrients and running like that too long will cause the plants to start feeding off themselves. That could be the yellowing you are seeing. Given the size of your plants I would expect your ppm should be in the 300 - 400 range. About 100 ppm of that should be cal/mag. The 3 part nutes are fine and likely weren't the cause of your problem.

 

[Bom Shiva]

In order to make a good diagnosis we need more information. I can see you are running HPS, what wattage and how close to the plants. What is the room temperature and humidity level? What is the temperature of your res? A cal/mag supplement is needed when running RO water. Are you adding some? If so, how much? You also need to get some nutrients in the system. Straight RO contains no nutrients and running like that too long will cause the plants to start feeding off themselves. That could be the yellowing you are seeing. Given the size of your plants I would expect your ppm should be in the 300 - 400 range. About 100 ppm of that should be cal/mag. The 3 part nutes are fine and likely weren't the cause of your problem.

Im running a 600 watt MH for veg, the temps are are between 78 to 81 F Res temp is around 78. Ive let them set with just RO water the past few days only watering when needed, they have perked up alot, ive moved them into larger pots, the roots are white and clean. They are now out of the rail, in 6 inch pots in a traditional ebb and flow, im switching to dynagro and i fo have CalMag+.do i still need to add calmag when using dynagro? There is nothing in the water yet, im scared yo up the PPM too fast, i jumped the gun when they perked up the fitsy time and 59 ppm shocked them agin, even worse..

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Here is how they are looking now



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Here are some new AutoFlowers that are about a week old, they have very light nutrients, Dynagro, im about to transplant them into large rockwool cubes....



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Oh, and humidity is usualy between 55% to 65%

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Oh, and humidity is usualy between 55% to 65%

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Here is a link to another forum i posted on a week ago when this issue first started, maybe this will give u a better idea of where i am now including the updated info on this thred/forum

http://www.420magazine.com/forums/frequently-asked-questions/220931-nutrient-burn-drooping-nitrogen-toxicity-claw.html