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Removed started grow question 3 years ago
I noticed a couple of light yellow/white tips (new leaves) could it be light burn?
and on older leaves I noticed some gray/whitish edge and some yellow/light brown edge. I don't think it's overfeeding (I've just started) could it be calcium deficiency?

Thanks for your help :pray:
Cheese Auto XXL - indoor
14 weeks
Cheese Auto XXL - indoor SkinnyJoe
Cheese XXL Autoflowering
37 comments · 2 years ago
Week 5
Leaves. Color - Mottling
DasBoof answered grow question 3 years ago
Hey there, that's a magnesium deficiency, you can tell from the yellowing between the veins and the burning / discoloration on the sides of the leafs affecting the older leafs first. It has nothing to do with NPK nutrients or light burn, but it's actually due to the high heat and "intense" light schedule, see : magnesium is used to regulate metabolism (which is itself regulated by temperature and humidity through something called VPD) and photosynthesis so with high heat and lots of light you'll get magnesium deficiencies as the plant isnt able to absorb enough quick enough. So you've already started adding some to the feed, that's good, maintain that. I would recommend also making it into a foliar spray like 3ml/L and just spray it on two to three times a week shortly before lights on or shortly before lights off. uptake by the leafs is 85% efficient compared to 15% through the roots. You should really try to get those temps down (have you considered an evaporative cooler?) and maybe even reduce the light schedule a touch too reduce the stress on the plant. Hope this helps ! :rocket:
DILLIGAF answered grow question 3 years ago
@SkinnyJoe So your plants are starting the flowering stretch so whatever you do , do not back down on the feeding and dont be tempted to over do it either. Once the blooms start to develop add extra potassium as she will need it
for those big stick buds Hope I have helped mate :muscle:
Majormolasses answered grow question 3 years ago
Just make sure it’s getting calmag and potassium and nitrogen as it starts to loose it’s values in your soil as you water your plant.
Experimentgreen answered grow question 3 years ago
Hey there so with the white tips i would suggest moving the lights up a few inches maybe to 26-30 and see if that problem stops. I also think the high temps can be an irritant, and i believe they can also affect the plants need and usage of calmag. I think using calmag as part of your regular regimen would be a good choice. The last photo with the line like yellowing that makes me think more of a handling injury like a fingernail or similar rather than nutrient/ light/or heat related. I hope this helps some. Happy growing.
GreenHouseLab answered grow question 3 years ago
Hi SkinnyJoe, it doesn't look like light burn as your light is at 24" and nutrient burn will appear on the tip of your leaves. This is starting to look like a potassium deficiency. You will have to switch to bloom nutrients now anyways which will contain plenty of this. Your Vega is full of nitrogen but your plant will now needs little nitrogen and more phosphorous and potassium for flower.