Day 19 since switch to 12/12 !! What is this problem? Can anyone help ?

Hey guys,

Day 19 since 12/12 switch.
Have been feeding them Nutrifield Coco A+B at early bloom strength (3ml per litre of water) and also Nutrifield Alaska Pure at early bloom strength (2ml per litre of water).

Noticed the other night that she had a bit of a burn of some sort, wasnt too sure what it was so to play it safe I flushed her out with 22L of 5.8ph water.
Last night I re-introduced her to nutrients. I went out and bought a more specific flowering nutrients called "Cyco Platinum Series Flower A+B".
So I fed her 4L of full strength Cyco A+B (3ml per litre of water) and also Bloom Strength NF Alaska Pure (3ml per litre water).
The solution had a ph of 5.8 after mixing, perfect didnt need to add up or down !!

Ill know later today when the lights come on if she is any better or worse !!

I hope I have done everything right, any help would be greatly appreciated !!

Heres some pics, anyone know what it could be?




p.s: she in da tub cause she getting flushed lol dont mind the shitty tiles

A ph of 5.8 in soil?

sorry I forgot to mention !

shes in a premium coco medium, pot is roughly 14L

BUMP ! someone must have some idea !!

Ok cool, couldn't tell for sure in pic so thought i would ask to make sure.. I would run nothing but water for a while.
They def have burnt tips so flushing and then going right back with nutess didn't help

well I thought it could have been maybe from the lights being too close and concentrated on the 1 spot. Because around the bottom of the plant theres no real burning at all and its only up higher in the plant where light is brightest. I had the light around 25cm from the top of the canopy, keep in mind im not using a cooltube just a batwing reflector !!
I moved the light to around jus under a foot away now so hopefully that helps. Do you think light could be the reason for the burns?

According to this website http://growweedeasy.com/heat-light-stress it looks more along the lines of Heat/Light stress than nutrient burn !!
Can someone confirm ?

she looks fine, dont want to go pure water right now or your going to cause deficiancy issues. keep on doing what your doing man plant looks great. always going to get some yellowing, i dont think i have grown a plant yet that didnt get some kind of blemish on a leaf or 2.

careful with the nutes. fine looking grow. GL

RetiredMatthebrute said:

she looks fine, dont want to go pure water right now or your going to cause deficiancy issues. keep on doing what your doing man plant looks great. always going to get some yellowing, i dont think i have grown a plant yet that didnt get some kind of blemish on a leaf or 2.

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Yeah I didnt want to just stop feeding her and shock her more from starvation. But i really dont think im overloading on nutes. Its my first time getting a plant to this stage so its great fun and very interesting but at the same time I dont want it to fuck up lol !! Ill keep going with her as she is and if she gets better great if not I might cut out the NF Alaska Pure out of her feeding schedule and see how she goes with just Cyco Platium Series A+B Flower.

Im using a 600w HPS in a tent with sufficient air circulation exhaust/intake. But I think from keeping her canopy around 25cm from the bulb it self was heating the canopy.
So now I have moved it around a foot away and it feels alot cooler with still a very sufficient supply of HPS power !!!!!
I read heat/light stress can also cause your plants to uptake more water than normal thus causing nute burn from the excessive ammount of water taken in!
I dunno alot of reading and alot of confussion for me... i need a phat doob

Po boy said:

careful with the nutes. fine looking grow. GL

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Thanks buddy !!!! Hopefully she gives me a zip or 2 of some half decent medicine !!