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Darkmanx started grow question 4 years ago
I have this crazy brown death happening to my leaves. Not exactly sure what's going on. PH is 5.5-6.5 and I watered down the nutes.
Bubba Kush Auto DWC Stealth
6 weeks
Bubba Kush Auto DWC Stealth Darkmanx
Bubba Kush Auto
16 comments · 4 years ago
Resolved
Week 5
Leaves. Color - Dark-brown
Removed answered grow question 4 years ago
Yo darkmanx. There are two things you can improve.
First try to lower your res temperature between 15°C and 20°C (59°F to 69°F).
Lower your solution strength to 1.4EC (700PPM), what you are seeing is potassium (K) toxicity, which locks out many other elements. Since you are using a LED bulb, there's no point in using a too strong nute solution.
Removed answered grow question 4 years ago
It looks like a nutrient deficiency or toxicity. Keep pH between 5.5 - 6.3 for hydro, that can help ensure proper levels and balance of nutrients are taken up. I usually see this with calcium because I'm using RO water. One other thing -- the fan in your picture looks pretty close to your buds. Might be getting a little wind burn. Honestly though, these look pretty damn healthy! I had to zoom in close to see the brown spots you were talking about. Good luck with the rest of the grow!
Black_Magic answered grow question 4 years ago
Highly recommend to listen
To Athos
FlavoursUk answered grow question 4 years ago
Hi,

Firstly, your in hydro. So 6.5 is too much. You want around 5.8/5.9. 6.1-7 is for soil growers. A boron deficiency in cannabis is relatively rare unless a plant is underwatered or in a really dry environment, and is usually accompanied by other types of nutrient or pH problems that appear as problems with the leaves.

The first signs of a cannabis boron deficiency is abnormal or thick growth tips along with brown or yellow spotting on new leaves.
In hydro, boron is best absorbed by the roots in the 5.5 – 6.2 pH range (in hydro, it's generally recommended to keep the pH between 5.5 – 6.5, but boron specifically tends to be best absorbed below 6.2).

Any brown spots on the new upper growth is a calcium deficiency. For now I'd back off the feeding until your corrected the issue and only feed it what it needs and you plants are a deep green anyway. I also noticed mild nutrient burn on the tips, so I'd definitely drop the nutrients.
Experimentgreen answered grow question 4 years ago
Hey so I see the leaves you mentioned...and their yellow browning is appearing at the tips and working backwards. All of your stats look good for hydro, ph temp etc. I see you have calimag so that's good. So either a. Your nutes are too high since the tips are sign of toxicity not deficiency. Or b. Being an auto flower it may be going into it "end" where the leaves begin to yellow and die and roll inwards. But 6 weeks does seem a touch early. Definitely dial back on the nutes, but also possibly flush your basin and plants.
Best of luck, other than that the plants are looking very nice.
Happy growing :)
Kindbudz answered grow question 4 years ago
It is hard to tell from the photos provided but based on the information you have provided it could be either a heat related issue or ore likely a nutrient issue. If you have not flushed with regular RO water you may want to start there and then adjust the nutrients. It looks like it could be a cal mag issue or a manganese issue. Would need better pictures of the affected leaves to better identify.