Magnesium Deficiency?
- Thread starter Ledj
- Start date
hotrodharley
Well-Known Member
Not seeing any sign of it.
Ghetto Child
Member
It's more than likely a Calcium deficiency (or both calcium and magnesium) since cannabis is rarely deficient in just the magnesium. Either way though, some liquid Cal Mag should fix that right up. Your gonna wanna stop the Cal Mag at around week 6 though.
hotrodharley
Well-Known Member
Looks closer to late nitrogen deficiency. Try a 1/4 strength touch of your nitrogen fert (grow). A 1/2 strength feed of micronutrients.
HotShot7414
Well-Known Member
It looks like the start of cal def and ph may be too high,some of my clones look like this minus the cal def,but i know my ph is kinda high and causes yellow spot that turn into bigger yellow spots.
Ghetto Child
Member
Here's a link to the old Overgrow nutrient deficiency guide (with pictures). Check it out. Maybe it can help.
Overgrow's Nutrient Problems With Pictures
Overgrow's Nutrient Problems With Pictures
Ph if anything is slightly too low - due to mismanagement and lack of space, this plant is growing in soil alongside a hydro setup and being fed from the res. using a dripper system. Ph of the system sitting around the 5.7 mark. All the hydro plants are good with no deficiencies apparent - and they are clones from this plant.
Cheers for that
Ghetto Child
Member
Yep, that's probably the problem right there. Surprisingly, it looks pretty good though for being grown with such a low ph. How many more weeks do you got left? You might be able to finish it by just feeding with straight water if it's close enough to finishing. That would bring the ph back into range for you too, allowing the plant to uptake some of the remaining nutrients in the soil.
HotShot7414
Well-Known Member
But thats not the ph of the soil,its a big difference
scroglodyte
Well-Known Member
its mag!! you were right, imo.
dannyboy602
Well-Known Member
cannabis are mag whores. especially indoors. outdoors, not so much a problem. lime drench. 1tbsp/gal water. that supplies Ca as well. stay away from too much N now. you will end up with claw. and those plants look sooo nice i would hate to see you end up with the dreaded claw.
Thanks for the conformation - I did think that it was mag to start with - have the cal mag on standby!! Will give them a foliar spray tonight before going to bed. Are the leaves likely to recover, or will they stay as they are - and what time scale am I looking at?
Thanks for the info - not much chance of me growing outside up here in the Scottish Highlands, so good to know for future projects. As mentioned above, will try the cal-mag foliar spray to see how that pans out, but do have the lime for backup if needed!