No idea what this is... Potassium issue?

xIPhobiaIx

xIPhobiaIx

Active Member
This is my second grow and did not run into this the first run (Was lemon cookie and this one is blue cookie) and need help figuring it out.

Was on vacation for a week and had the reservoir filled with 60 gallons of nutrient solution (Floraflex B1 + B2 and Bulky B) with an EC of about 2.6 as the plants I thought were showing nutrient burn at an EC of 3.3 (Which is the recommendation based on their feeding schedule for flowering week 5) but came back and the issue has progressed. PH of nutrient water is 6.4 and I use the Octopot system.

My grow room is sealed and I control ever variable via AC. dehu, co2, etc.
It was week 6 of flower that I left for vacation and this strain likes to go to 9 weeks (Blue Cookie) but seems like all growth has stopped as they are not fattening up obviously due to the issue.

These nutrient values are the ones for the water going into the reservoir. I have not tested but will soon the water in each Octopot basin.

EC: 2.6
PH: 6.4
Water Temp: 69

LED lights are 12 inches away
Temp: 76
Humidity: 50
CO2: 500 ppm (range is 400-600)

As you can see the tips seem to be burng and curling even on the top growth.

Thank you!
 

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ComfortCreator

Well-Known Member
What I think I see is nute burn. It's not horrible but too much nutes. I dont see anything particular that look off i.e. N P or K, more that you just have some burn and very green (which could also indicate a bit high N, but I think it is an overall too much issue).

How much you feed is based upon how they look, not the chart.
 
xIPhobiaIx

xIPhobiaIx

Active Member
ComfortCreator said:
What I think I see is nute burn. It's not horrible but too much nutes. I dont see anything particular that look off i.e. N P or K, more that you just have some burn and very green (which could also indicate a bit high N, but I think it is an overall too much issue).

How much you feed is based upon how they look, not the chart.
Click to expand...
Yeah, honestly the hardest part for me about growing so far is reading the plants and knowing more about nutrients on what to add when and responding to them and getting away from the chart.

Any idea of how much and educated guess from you would be to back it down to? This hydroponics and works similar to DWC so was thinking of maybe cutting the EC in half.
 
hotrodharley

hotrodharley

Well-Known Member
xIPhobiaIx said:
This is my second grow and did not run into this the first run (Was lemon cookie and this one is blue cookie) and need help figuring it out.

Was on vacation for a week and had the reservoir filled with 60 gallons of nutrient solution (Floraflex B1 + B2 and Bulky B) with an EC of about 2.6 as the plants I thought were showing nutrient burn at an EC of 3.3 (Which is the recommendation based on their feeding schedule for flowering week 5) but came back and the issue has progressed. PH of nutrient water is 6.4 and I use the Octopot system.

My grow room is sealed and I control ever variable via AC. dehu, co2, etc.
It was week 6 of flower that I left for vacation and this strain likes to go to 9 weeks (Blue Cookie) but seems like all growth has stopped as they are not fattening up obviously due to the issue.

These nutrient values are the ones for the water going into the reservoir. I have not tested but will soon the water in each Octopot basin.

EC: 2.6
PH: 6.4
Water Temp: 69

LED lights are 12 inches away
Temp: 76
Humidity: 50
CO2: 500 ppm (range is 400-600)

As you can see the tips seem to be burng and curling even on the top growth.

Thank you!
Click to expand...
I am seeing potassium deficiency and advanced potassium deficiency appears like nute burn.

Why are you running CO2? Atmospheric CO2 is almost 500. You're wasting money and gas right there.

Now WHY there's a deficiency is the question.
 
xIPhobiaIx

xIPhobiaIx

Active Member
hotrodharley said:
I am seeing potassium deficiency and advanced potassium deficiency appears like nute burn.

Why are you running CO2? Atmospheric CO2 is almost 500. You're wasting money and gas right there.

Now WHY there's a deficiency is the question.
Click to expand...
Because, I will be using CO2 in the 1000-1500ppm range to enhance future grows once I get the basics down pat.

Basically, future proof and also cannot grow here during the summer as the temps are too hot so cannot bring in outside air and this is not in a basement or the house.
 
C

ComfortCreator

Well-Known Member
hotrodharley said:
I am seeing potassium deficiency and advanced potassium deficiency appears like nute burn.

Why are you running CO2? Atmospheric CO2 is almost 500. You're wasting money and gas right there.

Now WHY there's a deficiency is the question.
Click to expand...
I thought that but notices the K burn was only in spots, not at the bottom so I leaned to overfeed still showing.
 
C

ComfortCreator

Well-Known Member
xIPhobiaIx said:
Yeah, honestly the hardest part for me about growing so far is reading the plants and knowing more about nutrients on what to add when and responding to them and getting away from the chart.

Any idea of how much and educated guess from you would be to back it down to? This hydroponics and works similar to DWC so was thinking of maybe cutting the EC in half.
Click to expand...
I am pretty sure you are just seeing the earlier effects of overfeed. Others can give more precise info on how to alter the feed but my 2c would be a lower level overall and a slight adjustment from grow nutes to bloom (i.e. lowering N a bit while raising PK...but just in relation to each other. Overall feed should decrease imo).
 
xIPhobiaIx

xIPhobiaIx

Active Member
hotrodharley said:
Still see potassium deficiency and again state you need to figure out why. An abundance of it doesn't ensure it's taken up. Check Mulder's chart and see if you can identify the main culprits. Meaning consider lockout of K.
Click to expand...
Which would typically be PH being out of range right?
 
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