Nute lockout or N deff?

[UberPooner]

Hope someone can help me crack this riddle of my plant issue!

I have started these ladys by seed and they have always been grown in rockwool.

They are currently in a 2 or 3 gal pot that gets flooded once every other day.

Root growth has gotten pretty awesome in the past few days, check out figure B from pic.

I have started noticing a lot of yellow growth on new top leafs, also they are skinny and kinda twisted, figure A and D.

First thought was PH issue, I checked my runn off and it was at 5.6, when i first started this grow I did have a ph issue though now it seems to be under control.

Next thought was nute deff, I was running ppms low at 200 with .5 conversion, I did that once I had the ph issue about a week ago.

Also from figure C you can see what looks to be nitrogen deff. I just hope its nute def and not nute lockout.

I upped nutes and now ppm is at 350 and has been for one night, nothing looked different/better a day later.

I dont think its a strain issue because I have two diff strains with same feeding and they are both getting same effects. one is afgan kush, other is a blueberry strain from dinafarm

Light is about 1.5 feed above, 600w mh.

Temps around +-75

new growth/upper leafs dont really have nute burn, but are skinny, twisted and kind of yellowing.

Im very confused and was wondering what you guys think solution is, im hoping it was nute deff and it will clear up in a few days, though something tells me it could be not.

 

[Cadfael]

Nutes lock out: Flush water over top of rockwool cube.

N Def: foliar spray with magic green or sea green or other N booster product.

You have killed two birds while gettin stoned.


PS I usually am running my nute mix in rockwool around 1100 ppm, I think you are running rather low ppm.

 

[plutosmoke]

for rw, keep in mind that when you flood the RW wicks up the water. If the level of flood is not high enough, the upper portion of the rw will dry and build up salt.

The bigger your plant gets the rw will dry out faster due to bigger root mass. You will have to flood more often to prevent the rw drying out. As a precaution, you should regularly top feed the rw and help flush out the concentrated nutes that accumulated in the top portion of the rw.

 

[UberPooner]

for rw, keep in mind that when you flood the RW wicks up the water. If the level of flood is not high enough, the upper portion of the rw will dry and build up salt.

The bigger your plant gets the rw will dry out faster due to bigger root mass. You will have to flood more often to prevent the rw drying out. As a precaution, you should regularly top feed the rw and help flush out the concentrated nutes that accumulated in the top portion of the rw.

WOW @plutosmoke, that makes complete sense yet I never would have thought of that. I have rw chunks in a container with a 4x4 cube at the top. The water level gets to like 3/4 of the pot and I assumed the rw wicked up the rest, however it is pretty dry at the top of the 4x4 cube. I really think this is an issue with me.

Do you think if I just top feed with what is in the res I will be ok?

OR

Do I need to do a complete flush from the top with no nutes(or like 3/4 nutes)?

ALSO* with having so many roots at the bottom, just thinking, could there be a chance that its ok to be salty at top of most of the root mass is on the bottom area which is less salty?

OR

no matter what, all medium needs to be at the same salt/ppm level?

Thanks!

 

[plutosmoke]

I wouldn't do a complete flush with no nutes, its like your starving it from note availability. Instead give a 1/4 strength flush.

Realize that as your plants uptake nutrients, your nutrients' profile changes, so your res may end up with more or less of a certain element, which is why they recommend a complete reservoir changeout every 2 weeks.

Anyway, just flush your plants out and take the ppm reading from the beginning run off, you'll see the ppm really high. Flush out with about 200-300 ppm solution and renew your res with 600-900ppm solution and you should see them bounce back in 2-5 days. All assuming your ph meter is well calibrated and your giving it correct nutrient recipe.

 

[UberPooner]

I wouldn't do a complete flush with no nutes, its like your starving it from note availability. Instead give a 1/4 strength flush.

Realize that as your plants uptake nutrients, your nutrients' profile changes, so your res may end up with more or less of a certain element, which is why they recommend a complete reservoir changeout every 2 weeks.

Anyway, just flush your plants out and take the ppm reading from the beginning run off, you'll see the ppm really high. Flush out with about 200-300 ppm solution and renew your res with 600-900ppm solution and you should see them bounce back in 2-5 days. All assuming your ph meter is well calibrated and your giving it correct nutrient recipe.

Thank you, I will try this. I thought 600-900ppm would be too high but i suck at whatever im doing so I will take ur advice.

How will I know if the plants feel 600-900ppm is too much?

That has been my main issue, trying to understand nute def vs nute lockout.

Sry if I sound really noob about this, please let me know what you think.

 

[plutosmoke]

too much nutes you will see burning tips, but 600-900 is in the safe zone for most strains for the size of plant you have.

My ranges are 1-2 weeks old = 300-600 ppm

2-3 weeks old 600-900 ppm

then in up to 1k in flower and my max in flower at peak would be around 1200, but i usually don't get there.

You'll need to look at the symptoms chart and start diagnosing. You have to know your nute lineup nutrients profile

 

[UberPooner]

Man, I bumped up to 350 ppm and am getting worse burnt tips, where they start curling up. That has to be a sign of nute burn.

Im so surprised im getting burn at 350ppm(.5 conversion). I think im going to flush with 100ppm, run that for a few days. then start upping ppm?

Also if I do that will my nitrogen issue get worse since it has less nutes, is there anything better I can do?