co2 problems

[icdog]

Has anyone experienced yellowing of fan leaves and almost dieing of the plants late in flowering around 40 - 45 days with co2?
What would cause this?

Running a perpetual setup with 4 tables spaced at 15 days each in flower.
So when one table enters the setup at day 1 flower the last table is at day 45 flower.

I've read that co2 is bad in the later stages of flowering.

Thanks

 

[stinkyattic]

Are you running your nutes strong enough, and your temperatures correct, to allow efficient use of the enriched atmosphere?

Have you ruled out other causes of this yellowing, including a natural paling of leaves as N is used up and not replaced by bloom ferts which contain none?

Have you considered running a fert or mix that supplies SOME N up to the end of stretch?

Fill out MyNameStitch's troubleshooting questionnaire to rule out cultural problems.

 

[icdog]

I tried a few times to add veg ferts with the flower ferts, no difference

 

[ubet28]

Your problem has nothing to do with co2 i keep a constant ppm of 1800 all the time veg and bloom. I do have a vary controlled setup i use the cap setup with a co2/4 controller and a ppm1 controller 6 burners and let me tell ya it cranks. In veg the shoots are going crazy in bloom well i don't even know were to begin harder fatter compact and 2 weeks less time are just to name a few. I would say the burn is just the late stages of flower what is the flower time for the strain you are growing?

 

[icdog]

Its like over burn, all the fan leaves dry up and the bud itself shrinks. If i turn the co2 off the problem goes away. So possibly its an issue with the plant when it is turbo'd with the co2.
55 days chronic

 

[stinkyattic]

So what are the specs on your feeding? Please give more info on your nute strength etc.

 

[icdog]

truncheon meter and the scale i use
Ec = 500 ppm

veg ec - between 1.2 and 1.4

flower ec
first 14 days - 1.6 veg ferts only
rest till chop - 1.8 - 2.2 bloom ferts

pure blend pro

this worked well before co2 so I didnt change it with co2

hydro nft system
ph in veg is around 5.7 - 5.9
ph in flower same

 

[stinkyattic]

There's an issue with Pure Blend... I'm having a hard time recalling, but the formula actually seems to be lacking iin one component. Shoot, I'm so not rememberful on Friday afternoons. Maybe someone whose brain is not in automatic shutdown mode will chime in.

CO2 DOES allow plants to transpire, and therefore feed, a bit heavier. But your EC looks fine to me. This is the edge of my expertise so I'm going to bow out of this one. Good luck man.

 

[icdog]

Thanks stinky, I also add some cal mag now and then

 

[ubet28]

If its a 55 day flower time then you should be done when using co2 enrichment it should knock 1 to 2 weeks off the bloom time whats the trichs look like cloudy amber clear what? If it is a 55 day strain you should also be flushing not adding nutes.

Are you saying that you are running a nute strengeth between 900 to 1100 ppm?

 

[icdog]

Does co2 really knock 1 - 2 weeks of the flower time?

If its a 55 day flower time then you should be done when using co2 enrichment it should knock 1 to 2 weeks off the bloom time whats the trichs look like cloudy amber clear what? If it is a 55 day strain you should also be flushing not adding nutes.

Are you saying that you are running a nute strengeth between 900 to 1100 ppm?

 

[ubet28]

Does co2 really knock 1 - 2 weeks of the flower time?

This all depends on the system you are using. I mean if you are using boost buckets then no. If its a bottle and done write then yes and if its the real deal with a burner set up then for sure. If you keep a constant ppm of 1500 through bloom you are gonna cut down the time it takes to harvest you have to go buy the trichs. They tell the whole story when it comes to time to harvest but if i was a betting man and you are 45 days into flower and the strain is a 55 day strain then i would say you have a milky or cloudy trich maybe even some starting to turn to amber. In my opinion you need to start watching the trichs and stop worrying about the nutes. If it was me i would do a complete water change and follow buy adding my flushing solution till i am ready to harvest. But that is me. Pics would be really helpful.