I just ended week 4 of flower, did a good amount of defoliation at the end of week three and since then my lower leaves of 3 plants are yellowing and turning brown on the edges and tips the top of the plants seem fine ( ill attach a picture of the top ) and the leaves are definitely dying. Im in ffof running synthetics with cal mag at 6ml gal, runoff was 6.51 1390ppm on the worst yellowing one the others are right near those numbers. These pictures were taken right after a watering. Any ideas ? Thanks for any answers
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Is there any possibility of nutrient lock ? Looks like a few things, the tips and edging looks like phos def and the yellowing look nitrogen def . . .
Just my .02
I will say, all the ppm measurements are stuff I do not understand.
Hard to tell in that lighting, but the way the tips of the leaves look, does it look like Magnesium deficiency? https://www.mrgrowit.com/post/magnesium-deficiency-in-cannabis-plants
Definitely could be, ill try to attach better pics. I can take them out of the tent if need be for better pictures. I give them cal mag every feeding so water feed water feed. Also when i feed they get a quarter dose of Humboldts magnum(magnesium). Should i give them it every watering or just up the dose when i feed you think ?
@Mr. Grow It I don't believe it's mag then. I need a more experienced opinion on this. The new pics show it better.
I do use my dehumidifier water for watering my plants but i filter it when it comes out of the unit with a brita, i thought maybe that was doing it but i dont think it could? It has below 10 ppms every time i check it and ive been watering with it for like 3 weeks now. Maybe im not supposed to use that ?
what is the ph of the water?
Ph of my dehumidifier water before adding any nutes or anything is around 6.6 to 6.8, thats right out of my brita. After i water my plants my runoff is usually around 6.3 to 6.5 throughout the grow
How often you water?
Im in 5 gal pots, i water until runoff when they feel easy to pick up, about every 3 days
Looks like over watering or nitrogen def. to me
This is how they are looking today, definitely getting worse. I wouldn't think im overwatering because i water when i can pick the pots up with one hand which is usually around 3 days, maybe a nitrogen deficiency its starting to move up the plant by the looks of it. Its affecting multiple plants at the same time
Strictly on older growth and moving up I would say Nitrogen deficiency. I was thinking magnesium but you've been feeding calmag and manganese is on newer leaves. If your drainage is good then it wouldn't be overwatering unless the roots weren't taking up nutes but the rest of the plant looks good.
Hope you are able to correct this my friend. Makes it tough when you're midway through flower.
Kind of looks like multiple deficiencies. What nutrient lineup are you using? Have you flushed at all throughout the grow?
Im using humboldts county for the nutrients with cal mag and recharge once a week. Im doing water feed water, and i water until runoff everytime but ive never flushed them because ive kept my ph around 6.2 to 6.6 every watering and my ppms are usually within range. Last night i fed nutrients and my ppm was 1690 and my ph was 6.41 on that plant in the picture i have 3 that are affected though
@tecker2992 How much runoff? Do you let the runoff absorb back up into the medium or do you dispose of it?
I have a good amount of runoff, i have them elevated off the ground and those plastic saucer dishes under them to collect the runoff. Those dishes are full everytime i water and i dispose of it, the water cant get sucked back up due to the little stands they're on