Do I Have a Nutrient Deficiency?

Learning2GrowWeed · Sep 8, 2020

I am new to growing and having some issues. I have only been growing Morrocan kush, but just recently decided to grow multiple strains. I also just switched to General Hydroponics 3 bottle system and CMH lights (was LED). I am having my plants slowly turn yellow at the ends and eventually to what you see below. I thought it was a magnesium deficiency, but after giving them some cal-mag it is still getting worse. It only seems to be on the tops leaves. My lighting is at 50k lux, the heat stays around 75, and 50% humidity.

CF89 · Sep 8, 2020

Damn those look rough. I also use the GH 3 bottle system in soil and my first grow went amazing using this chart. Tap water. No ph meter. No tds meter.

Learning2GrowWeed · Sep 8, 2020

CF89 said:
Damn those look rough. I also use the GH 3 bottle system in soil and my first grow went amazing using this chart. Tap water. No ph meter. No tds meter.

Mine starts with yellowing in between the veins at the tip. I can't see any that look close other than the potassium deficiency picture. I have been doing fine with Ethos Moroccan Kush, but any other strain seems to have issues. I imagine moving and changing lights, nutes, temps, and humidity have messed them up some, but this just worsens regardless what I do.

CF89 · Sep 8, 2020

What is your feeding schedule? How much of each?

Learning2GrowWeed · Sep 8, 2020

CF89 said:
What is your feeding schedule? How much of each?
Watering them every 3 days alternating between water and nutes every other time. 3 micro 2 bloom 1 gro per gallon.

Beachwalker · Sep 8, 2020

Learning2GrowWeed said:
Mine starts with yellowing in between the veins at the tip. I can't see any that look close other than the potassium deficiency picture. I have been doing fine with Ethos Moroccan Kush, but any other strain seems to have issues. I imagine moving and changing lights, nutes, temps, and humidity have messed them up some, but this just worsens regardless what I do.

It does look like a potassium deficiency but why is the question; what medium are you using, how are you pH'ing and to what number are you setting the ph and PPM, have you done a slurry test? The more info you can offer the better

Learning2GrowWeed · Sep 8, 2020

Beachwalker said:
It does look like a potassium deficiency but why is the question; what medium are you using, how are you pH'ing, and to what number are you setting the ph and PPM, have you done a slurry test? The more info you can offer the better

6.0-6.5 with fox farm ocean forest 800-900 ppm and what's a slush test?

Skunk199 · Sep 8, 2020

I wait 10 minutes

Learning2GrowWeed · Sep 8, 2020

Skunk199 said:
I wait 10 minutes

I'll check that tomorrow and let you know the results.

Beachwalker · Sep 8, 2020

A slush test, or slurry as I like to call it, will tell you things about your soil that you can only imagine otherwise

Like for instance it might tell you that you haven't been flushing out your soil on a regular basis

Recommend you do some reading and then if you get these results let us know

Edit: 6.5 is the optimum soil pH; 6.0 is too low & may have contributed to your issue

Learning2GrowWeed · Sep 8, 2020

Beachwalker said:
A slush test, or slurry as I like to call it, will tell you things about your soil that you can only imagine otherwise

Like for instance it might tell you that you haven't been flushing out your soil on a regular basis

Recommend you do some reading and then if you get these results let us know

Edit: 6.5 is the optimum soil pH; 6.0 is too low & may have contributed to your issue

Ah, I was always under the impression anywhere between 5.5 and 6.5 is good. I think you may have found the issue as it came back 6.05.

Aqua Man · Sep 8, 2020

50k lux no issue but how close to the plants is that cmh?

Beachwalker · Sep 8, 2020

Aqua Man said:
50k lux no issue but how close to the plants is that cmh?

+1 Damage seems to be all up top and potassium deficiencies usually start at the bottom ?

Aqua Man · Sep 8, 2020

Beachwalker said:
+1 Damage seems to be all up top and potassium deficiencies usually start at the bottom ?

I usually find em starting at the middle and lower yes.

MIMedGrower · Sep 8, 2020

800-900 ppm will burn up most plants i like to grow. Very heavy feeders may not mind. I would flush out the nutrients and feed much less.

Aqua Man · Sep 8, 2020

I agree if there is high ppm it can also affect water uptake.

I would look at it like this.

Potassium regulates water uptake, salinity affects water uptake maybe a bit of both being an issue...could be many causes like PH also... high nitrogen can burn the plant but doesn't quite look that way to me since I don't see the signs but could just be my eyes. then strong light and poor transpiration leads to burning of the leaves from the light because they cannot cool themselves well enough.

Learning2GrowWeed · Sep 8, 2020

Aqua Man said:
I agree if there is high ppm it can also affect water uptake.

I would look at it like this.

Potassium regulates water uptake, salinity affects water uptake maybe a bit of both being an issue...could be many causes like PH also... high nitrogen can burn the plant but doesn't quite look that way to me since I don't see the signs but could just be my eyes. then strong light and poor transpiration leads to burning of the leaves from the light because they cannot cool themselves well enough.

Ok, so got the PPM down to 300-380 on all of them and PH around 6.5-6.58. Hopefully, that will fix my issue.

Learning2GrowWeed · Sep 8, 2020

Beachwalker said:
+1 Damage seems to be all up top and potassium deficiencies usually start at the bottom ?

About 24" and the ones burnt the most are the ones furthest away oddly enough.

Aqua Man · Sep 8, 2020

Watering practices?

Learning2GrowWeed · Sep 8, 2020

Aqua Man said:
Watering practices?

1 gallon per plant every 3 days in 2.5-gallon pots and I was using my normal RO water at 6.75 every other time and When I added nutes allowed it to fluctuate between 5.5 and 6.5. I think allowing too much acidity in the water and not flushing with enough water. I wasn't allowing enough water to flush through the plant, based on how many gallons it just took me to do it.

Do I Have a Nutrient Deficiency?

Do I Have a Nutrient Deficiency?

Learning2GrowWeed

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