Def or Excess

[Rudra]

Hi everyone , I have this AutoWidow plant and have a little problem. The plant is 38 days old.10-12 days ago It started light green/yellow tips on top leaves , later tips started curling up. And now I have that spots on lower leaves.
What is this ? I was give to this plant Sensi Cal/Mag last two weeks and sprayed it every week with Revive.
Help me to determine what is this , is that a zn,cal/mg def or may it be cal or K excess?
Temperature 25-27 C , 45-50% humidity ,water from bottle with ph 6.0-7.0, ec 210μS/c
,watering ph 6.0-6.5, 300-600 first weeks , 600-950 ppm last two weeks , 620w led mixed COBs 5000 and 3500 with secondary 5w diodes 60cm above canopy. Plagron light mix + plagron supermix , feeding by this table from AN but with lower dosages of base (1-2,25ml/l ) and additives, last two weeks Sensi Ca/Mg 1ml/l.After every week of watering with nutes I was watering only water 6.0-7.0ph with sensizym.
Sorry for my english.Thank you.

 

[Rev. Green Genes]

Hi Rudra,

Good looking plant there. I often suspect pH after a shift to bloom nutes. It would be worth the effort to make sure your root zone pH is proper before trying to change a nute schedule. It does however look like it's a little high in N, which often happens just after the bloom transition. I would test pot pH first to be damn sure, and then ease up on base nutes for the next feed.

 

[Rev. Green Genes]

She looks like she's almost ready to bulk up, and that is a crucial time for PK uptake. That's why I suggest the pH check really. I hope that helps. Waira, namvet, or go auto are better at this than me.

 

[Rudra]

Hi Rudra,

Good looking plant there. I often suspect pH after a shift to bloom nutes. It would be worth the effort to make sure your root zone pH is proper before trying to change a nute schedule. It does however look like it's a little high in N, which often happens just after the bloom transition. I would test pot pH first to be damn sure, and then ease up on base nutes for the next feed.

Thank you for answer , I will water next time for runoff and take ph probe.

 

[Waira]

Mate, she looks a little nute cooked with those top to bottom burned tips,.. This can happen as a cumulative thing, not just a round or two of feed dosing,.... this may also have lead to off pH in the pot, which can lock out certain nutes, plus too much nutrient salt ions in there start to interfere with the uptake of nutes as well,.... symptoms look like a mix of N defc. and Mg defc.,....some N defc. in the lowest leaves is normal for this stage, so it's not a bad sign, but the Mg is,.... A common misunderstanding with AN nutes: they do not keep the pH in the pot sefl-adjusting, that only works while in solution, with water that isn't hard (mineral rich),... with no pH soil probe, getting a pH reading will be a pain,... tell you what, let's do a very crude test, just to see if we are on the right track here,.. next time, use water only; take the pH, unadjusted, and the EC/ppm; water enough to get about 1/2L of run-off; collect in a clean saucer! test for pH and ppm's.... let us know results,... we need to see if your should flush the pot if it's badly off and/or very high ppm's,...

 

[Rudra]

At the same time I wanna ask one more thing.
I have salts in the bottom of my Connoisseur Grow part B bottle , I shake the bottle and hear there is salts in it. Can it be bad and cause that type of problem ?

 

[namvet25]

At the same time I wanna ask one more thing.
I have salts in the bottom of my Connoisseur part B bottle , I shake the bottle and hear there is salts in it. Can it be bad and cause that type of problem ?

How old is it?

 

[Rudra]

How old is it?

I’m bought it in August 2017 and opened in the middle of October.

I’m using bottled water because my tap water is 8.5+.And I don’t have good ph tester for soil.
I can’t buy good Accurate8 from amazon because the vendor don’t send to my country.
And another one I don’t know is it good or not
https://www.amazon.com/gp/aw/d/B00NTPVHOG/ref=psdcmw_3480689011_t1_B0746XC9XB

 

[Rudra]

Mate, she looks a little nute cooked with those top to bottom burned tips,.. This can happen as a cumulative thing, not just a round or two of feed dosing,.... this may also have lead to off pH in the pot, which can lock out certain nutes, plus too much nutrient salt ions in there start to interfere with the uptake of nutes as well,.... symptoms look like a mix of N defc. and Mg defc.,....some N defc. in the lowest leaves is normal for this stage, so it's not a bad sign, but the Mg is,.... A common misunderstanding with AN nutes: they do not keep the pH in the pot sefl-adjusting, that only works while in solution, with water that isn't hard (mineral rich),... with no pH soil probe, getting a pH reading will be a pain,... tell you what, let's do a very crude test, just to see if we are on the right track here,.. next time, use water only; take the pH, unadjusted, and the EC/ppm; water enough to get about 1/2L of run-off; collect in a clean saucer! test for pH and ppm's.... let us know results,... we need to see if your should flush the pot if it's badly off and/or very high ppm's,...

Thank you for answer. I have results of runoff: water on exit PH 6.6 , ppm 700-750 ( Hanna 1,46) starting water ph was 7.0 with 0,05 ec (Hanna) Then my soil ph is 6.6-0.4= 6.2

 

[Waira]

-- that's it Rudra! Same thing, made in the same Chinese factory, just a different brand name,...

Huh, the pH and ppm's seem OK after all, good news... but they are rough estimates, so while est. 6.2 is OK, it's on the edge of becoming too acidic; adjust the Ca-Mg up to 3ml, start your bloom nutes if you haven't already,... lets see what a few days brings, nothing corrects overnight,...