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Your little one is lacking magnesium too

Also, get some microbes in and use a foliar spray, they help to get a good Ph

I‘d water with the 7 ph you initially have and the PH will raise. calmag and N is also looking rather low.

if it stays wet for a week its not good. do you have drainage holes?

Id say its lacking Ca. good luck

nute burn

what kind of water do you use ?

OP was last online 2013. You digged deep to find this thread, better open a new one

look I have something similar https://rollitup.org/t/dead-spots-on-lower-leaves.1000248/#post-15179769 Do you supply mag?

Since you have solved it, I allow myself to ask if my problem was calmag heat too? https://rollitup.org/t/dead-spots-on-lower-leaves.1000248/#post-15165460

I've send literally 100+ guys doing just fine with the biobizz line and recommended dosage, every watering. This is not a mineral fertilizer

From the article you quote: Unlike most other deficiencies that cause yellowing of the leaves, a sulfur deficiency will start at the back of the leaf and move it’s way forward as opposed to starting at the tips. I can't spot that on his pics, can you?

awesome! What can you say so far about phenos, veg growth, smell, stretch, estimated yield/flowering days?

Anyone tried Wowzers yet?

me neither! :) A light organic feed wouldnt hurt imo. Or make a compost tea.

thrips looks different https://www.growweedeasy.com/cannabis-plant-problems/thrips but sure get a microscope, you can spot them.

hard to tell, could be Potassium, calcium.. not entirely sure

https://www.growweedeasy.com/cannabis-plant-problems/ph-fluctuations

looks like cal mag deficiency to me, and too much Nitrogen

A little high, Id aim for 6.5 to 6.8 PH for earth. I'd get some cal/mag separately. Its always useful to have that around. I also dont know Westland Gro-Sure, is that 4 months for cannabis or something else?