Burnt tips in pre flower and skinny new leaves

[Beydot98]

Hey guys so im having some trouble while in preflower. Forbidden runtz auto day 45. She was lush nd healthy in veg no issues but noticing in pre flowering her leaves r getting a lil skinner and burning at the tips. Ive been feeding light nutes only for the past 4 days maybe 1/4. Currently using canna range - rhizo, cannazym, a+b, calmag, boost. I feed at around 5.7-6 ph until runoff. Light distance 300w 45cm. Conditions are 27-29c 20/4 with roughly 24–25 night temp. 57-60% humidity with a fan moving air beneath the canopy. I stress train and shes recovering quickly and getting taller by the day with 0 issues and stem is thick and healthy. Any suggestions or ideas on what it might be?.

 

[oldham]

Totaly noob. But if it's soil then pH is to low. My 2 cents.
See if iam right on this one. wait for the experts. Haha

 

[Beydot98]

Totaly noob. But if it's soil then pH is to low. My 2 cents.
See if iam right on this one. wait for the experts. Haha

Nah coco ph is 5.5-6 and 5.8 during flowering. Im thinking its light burn so i got a lux detector on my phone and dropped it down to 30000 so well see if it helps as it was at like 50000 which apparently is for flowering.

 

[Mañ'O'Green]

@Beydot98 Welcome to AFNIt is not light burn. PPFD of 1000 is ok for flowering.

You may be a little heavy on K but I do not see any real issues. The skinny leaves are genetic and shows Sativa traits.



Ps if you are in soil you may be feeding too often? If in coco be sure to fertigate to 10%-15% runoff. Temperatures are a bit high and the light schedule is too aggressive IMPO. I find 18/6 the best for autos.

 

[Beydot98]

@Beydot98 Welcome to AFNIt is not light burn. PPFD of 1000 is ok for flowering.

View attachment 1565212

You may be a little heavy on K but I do not see any real issues. The skinny leaves are genetic and shows Sativa traits.



Ps if you are in soil you may be feeding too often? If in coco be sure to fertigate to 10%-15% runoff. Temperatures are a bit high and the light schedule is too aggressive IMPO. I find 18/6 the best for autos.

Hmm id agree with the sativa side but shes only got 35% in there nd based off other growers of these strain i havent seen leaves as skinny. But different grow so different results. Im gonna cut down my feed for K for a few days as a cannazym and a+b all contain it and see how she reacts. Ive got my light running at 70% and 30000lux just incase it is light burn so well see in the coming days.
Thanks for the info!

 

[Beydot98]

@Beydot98 Welcome to AFNIt is not light burn. PPFD of 1000 is ok for flowering.

View attachment 1565212

You may be a little heavy on K but I do not see any real issues. The skinny leaves are genetic and shows Sativa traits.



Ps if you are in soil you may be feeding too often? If in coco be sure to fertigate to 10%-15% runoff. Temperatures are a bit high and the light schedule is too aggressive IMPO. I find 18/6 the best for autos.

Also what temps do you grow under LEDS as my research has shown 28-29 is optimal temp then 27 in flower. I have no issue with letting it said at 26 as that is the temperature it stays at with no external changes like fans or heaters. And would it be ok to flip the schedule to 18/6 now from 20/4 or could this affect her?

 

[Mañ'O'Green]

78°F/26°C Day, 68°F/ 20°C night are ideal. I think in Fahrenheit so the high was not as high as I thought. I often have to grow at much higher temperatures as I live in a desert.

No it is not a problem to change the day length for Autos. Photos will throw a fit.

If you were running HID lamps you can get light burn mostly from the IR. It is almost impossible to burn with LEDs. Think about it the sun is putting out 2000 PPFD or 108,000 lux.

This is where I am running my garden right now.

I have had a heck of a time with keeping RH in range because my humidifier filter keeps failing to wick water. I will fix that before the next grow.