pistils turning brown 3 weeks into flower

[Wackgrower]

Hey so im 2 and a half weeks into flower and the pistils on my plants are turning brown. These are the conditions currently
4x2 tent
48% humidity 75 degrees
Grow light science grow 300 321w light 12 inches above canopy about 60% power
I'm growing in coco coir using camg+, pure blend pro bloom, and liquid bone meal.
If you need any other info please let me know.

 

[xtsho]

Ditch the liquid bone meal. You don't need that much phosphorus. The Pure Blend Pro Bloom is enough. Lights probably too close as well.

 

[Wackgrower]

Ok I will ditch the bone meal. And I'm still having browning problems on my other plant that's about 8 inches shorter than the tall plant. Any idea about how far my light should be placed away from the canopy?

 

[xtsho]

Ok I will ditch the bone meal. And I'm still having browning problems on my other plant that's about 8 inches shorter than the tall plant. Any idea about how far my light should be placed away from the canopy?

I'm no expert on LED lighting. You might want to post over in the led section and ask about that.

LED and other Lighting

Growing with LEDs / Inductive / Plasma etc.

www.rollitup.org

 

[hotrodharley]

Ditch the liquid bone meal. You don't need that much phosphorus. The Pure Blend Pro Bloom is enough. Lights probably too close as well.

Temperature too low as well.

 

[hotrodharley]

Ok I will ditch the bone meal. And I'm still having browning problems on my other plant that's about 8 inches shorter than the tall plant. Any idea about how far my light should be placed away from the canopy?

You need to be able to measure the PPFD of the light. Requires a meter. Apparently phone apps for lux and some math can do the job. These ain't like HPS.

 

[inth3shadowz]

For flower with LEDs I've talked to employees at Mars Hydro and Spider Farmer, typically it's 18 inches 90-100% power for flowering. It's likely the temps causing this though...my basement is super cold during winter and the plants closest to my fans tend to have the same look sometimes. I may switch to HID in winter honestly.

 

[hotrodharley]

For flower with LEDs I've talked to employees at Mars Hydro and Spider Farmer, typically it's 18 inches 90-100% power for flowering. It's likely the temps causing this though...my basement is super cold during winter and the plants closest to my fans tend to have the same look sometimes. I may switch to HID in winter honestly.

I've sure considered adding HPS back in with the LED for winter here.

 

[inth3shadowz]

I've sure considered adding HPS back in with the LED for winter here.

What do you recommend HPS or CMH? I haven't touched an HID light since I was a teen in highschool growing out my closet lol

 

[hotrodharley]

What do you recommend HPS or CMH? I haven't touched an HID light since I was a teen in highschool growing out my closet lol

If I was going to buy again I'd buy a double ended HPS. Far better production. I sold all my HID lighting last year.

 

[Wackgrower]

Ok I will have to try that ppfd app. Also what temp should I shoot for

 

[Wackgrower]

Also thanks for the info guys

 

[hotrodharley]

Ok I will have to try that ppfd app. Also what temp should I shoot for

If LED you want 82-85 at the leaf surface.