Yellowing an small top leaves

[Damking1]

Hello hope someone can help us.

This is the first time i have grow this strain (holy grail kush). I have just flipped my plants to 12/12 and notice all the topleaves are small starting to yellow. The are a few leaves (not many-pic below) on some plants with are green but with yellow burnt edges. I have been researching but coming up with different answers. Any ideas ?

I have 8 plants in 45L pots. 3x 600w hps lights. Good air circulation an temps around 78-80 F. I get my EC to 1.6, PH 5.9. I use Dutch pro take root an multi total. An cannas mag cal.

I have grow before but only cheese an never seen this issue.

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[Timbo287]

It looks like it could be burning from your lamps I had a similar issue with the new leaves on my autos developing little yellow and brown tips didn't hurt the plant at all. How far away from the canopy are your lamps? I wouldn't worry too much though as long as the rest of your plant is healthy

[Damking1]

It looks like it could be burning from your lamps I had a similar issue with the new leaves on my autos developing little yellow and brown tips didn't hurt the plant at all. How far away from the canopy are your lamps? I wouldn't worry too much though as long as the rest of your plant is healthy

Thanks for the reply. The lights are about 2meters away mate. I had them alot closer an my friend said it could be that as it was only on one plant. Not its on them all.

[Timbo287]

Hmm.... light burn would have been my first guess. The only other thing I can think of is nute burn but I'm not sure. Sorry buddy we've hit the limit of my knowledge. Hopefully somebody with more knowledge can help you out

[Blue]

I take it your growing in coco? Your burning the plants with an Ec of 1.6 at this stage around 1.2 should be ample until they start to flower. They look rather droopy to me and your coco looks really dry. How often are you watering these?

[Damking1]

I take it your growing in coco? Your burning the plants with an Ec of 1.6 at this stage around 1.2 should be ample until they start to flower. They look rather droopy to me and your coco looks really dry. How often are you watering these?

Thanks for the reply.

I have always used an ec at 1.6. Ill try an bring that down. Im feeding them about 1litre top feed and 1/2litre feed in the bottom tray every other day. The coco is dry on the top but an inch down it is still pretty moist. What would u recommend?

[Blue]

Thanks for the reply.

I have always used an ec at 1.6. Ill try an bring that down. Im feeding them about 1litre top feed and 1/2litre feed in the bottom tray every other day. The coco is dry on the top but an inch down it is still pretty moist. What would u recommend?

Always using an Ec of 1.6 isn't ideal. The nutrients the plants don't use will accumulate as salts in the pot.

Stop with the bottom feeding and run enough water/feed Ec1.2 through the top of the pot daily until you achieve 20-30% run off at each watering. Test the run off readings with your ph and Ec meters and stick the numbers up in here.

[Damking1]

Thanks for the reply. I think ive overwatered them. Defo seems the more likely. Anyone know the best way to recover them ?

[Blue]

Thanks for the reply. I think ive overwatered them. Defo seems the more likely. Anyone know the best way to recover them ?

You cant overwater coco due to the aeriation of the substrate. And your medium is dry in the pictures... But fair enough

[FunkyB]

There should be some pale green going on though as you've just flipped and your plants are beginning to stretch and produce new leaves at a quicker than normal rate, but as said, there some problems with your grow which needs attention. But don't panic if more pale leaves are produced, if you've corrected where you need to they'll improve their colour as the leaves mature.