Best Way to Fix Nitrogen Toxicity in Coco?

[GoodSmoke]

Im no pro, but flushing with just a single nutrient might be damaging, id use a balanced nute mix, at the strength you want and run it through thouroughly, you dont want to starve her of anything atm.

 

[Kazman420]

Just finished fertigating and since I hadn't heard back from anybody I kinda went with my gut. I didn't do any flushing and just reduced the ppm's by half. It's the first week of bloom nutes, and I think General Hydroponics actually considers this a transitional phase because it's the same amount of Gro as Bloom. The only thing that's a different amount is Micro. I don't know if you would call that balanced or not since the NPK is different for each bottle.

Here's an image for reference:

 

[Kazman420]

hello can u say what giving ?
and inflow outflow ec please

General Hydroponics Flora Series - 6 Part
Inflow: 1.3 EC
Outflow: I haven't measured this in a few days. Last time I checked it was coming out like 0.4 EC less than what I was putting in, which is why I started increasing the amount I was giving them.

I'll measure it tomorrow after I feed them and get back to you.

 

[Olderfart]

Last feed was 658ppm (Hanna)

If it were me, I would drop it to ~550ppm and watch it for a few days to see how the new growth behaves. You don't have yellowing tips yet, so likely no harm done so far. What I would not do is change the ppm by more than 150 or so, because that large a ppm change may cause too abrupt a swing in osmotic pressure on the roots. If you need to move further than that, do it in a couple stages a couple days apart.

I don't think changing the nutes to bloom had much to do with the problem. The issue was, in my noob opinion, that the nutes were too concentrated, causing osmotic stress on the roots. Doesn't much matter the whether the salts are mixed for grow or bloom, the issue is that the roots were starting to feel osmotic pressure from the high saltiness in the medium. If you have not already done so, have a look at the information on Cocoforcannabis.com. The gurus there claim that much of what is diagnosed as "nitrogen toxicity" is in fact osmotic stress, not too much nitrogen. Have you been watering to 10-20% runoff every time? If not, the issue may be buildup of salts rather than starting with too high a mix.

Anyway, back to your question, what I would do is in the first watering with the reduced ppm mix, I would give her a good flush with the new mix to get the old salts out of there and get the coco to where you want ppm-wise.

Other than initial hints of issues, she is doing well and should continue nicely if you get the ppm sorted.

Good luck with it.

 

[Kazman420]

What I would not do is change the ppm by more than 150 or so, because that large a ppm change may cause too abrupt a swing in osmotic pressure on the roots.

Yikes! I definitely reduced it by too much then. Well that was about 3 hours ago. Should I give another feed that's at ~550 right now? Or have I already done more harm than good?

I water to 20% runoff every single time without fail.

Btw, I appreciate you chiming in @Olderfart!

 

[Olderfart]

Yikes! I definitely reduced it by too much then. Well that was about 3 hours ago. Should I give another feed that's at ~550 right now? Or have I already done more harm than good?

I water to 20% runoff every single time without fail.

Btw, I appreciate you chiming in @Olderfart!

FWIW, I would flush immediately with 550 ppm. I doubt you need higher ppm than that, and I doubt that you have done damage yet with the low ec watering. Lots of peeps seem to get away with worse. Once you get her flushed, give her a couple days to show what is up. If you don't start to see yellowing tips, continue with 550ppm, at the first sign of yellowing tips on new growth, back off again to 500ppm and watch again for a few days. I am assuming here that the nute mix you are using is balanced, but I am not familiar with the line. If you are adding additional goodies, that could change the picture.

@Mañ'O'Green is the guru here, so if he has a different opinion, go with his advice!

Good luck with it.

 

[MrAutoGrower]

Lower the dosage of whatever product you are using with the nitrogen and make sure you are getting 20% run off to flush the nitrogen back out

 

[SOOTDAWG]

Hey @SOOTDAWG, thanks for the reply! Yeah I actually just re-discovered that Lifecycle of an Autoflower post by Muddy yesterday.

In regards to pre-flowers, maybe I'm not sure what that means exactly. I first noticed stigmas coming from the calyx's along the main stem on day 24. Shortly after there were a few appearing along the upper branches. Can't really see them in the pictures, not that there is much to see. I'm guessing that's not what a pre-flowers are?

I'm assuming a Calmag Flush = PH'd water with just CalMag in it? How many ml/ppm per gallon? I'm using GH CaliMagic which unfortunately has 1% nitrogen in it.

yes....stigmas/pistils.......remember when they appear they are only giving you a signal as to what gender they are-showing sex--they still have more time to veg...as i said before--peeps see pistils and think they are in flower when only the plant is showing sex....they hit with bloom nutes and i see that hinders them/stunts.......

i do 5ml calmag to a gallon

 

[SOOTDAWG]

Im no pro, but flushing with just a single nutrient might be damaging, id use a balanced nute mix, at the strength you want and run it through thouroughly, you dont want to starve her of anything atm.

this is coco----you want to keep that calmag present always....you definitely dont want that flushed out of medium......then you have a deficiency that you wont see for weeks and then you cant fix/ or your chasing the problem due to autos fast growth.

 

[SOOTDAWG]

and @Kazman420 ...check out .....cocoforcannabis...website...you will up your game 100% and understand more of my jist