Wow, internet is great. Read the whole thread especially
@kratos015 posts hope he comes back. I am having similar issues to most of yours.
I used to grow with mineral nutes getting huge harvests then wanted to switch organics I like it but always get deficiencies around week 7-8
which looks like calcium deficiency, rust brown spots on leaves, upper stems turn purple, pistils turn brown in mid flowering and reduced yield. I still prefer the taste though. This happens to some plants while others grow perfect dense buds.
My mistakes: Overwatering sometimes (because of drip irrigation not by hand) and Overfeeding maybe.
I use 5G air pots filled with biobizz lightmix and worm humus (3:1) mixed with Biotabs products. Plants grow exceptional until flowering kicks in.
im using my tap water which comes at 0.43 EC. Let is sit for two days and put into Blumat reservoir and plant feed itself. I make compost tee and molasses feeds occasionaly.
Some people told me I must supply more calcium (gypsum) simply because what is in tap water and the nutrients is nowhere close to enough when growing under leds. This is the most advise I get. I couldn't believe it because the products I use all contain some ca and mg in it plus the soil and humus that I used combined with the ingredients of tap water.
Second option is soil ph gets too acidic when I overwater and locks out nutrients. I tend to believe this more because im growing them very humid the surface of the soil never gets dry.
And by reading this topic Im thinking maybe my soil ph is too high because of the caco3 presence in my tap water.
Im not a chemist or nowhere near that my head overwhelmed reading about many chemical compounds and how they react each other.
This last option looks more real to me now because I always get deficiencies later in the grow. ( salt buildup overtime) and it binds the calcium and plant looks like it needs it.
I have read many things about soft water hard water ppms etc.. It's all confusing different parts of the world using different ppm derivations.
It may not be the best but im putting my water analysis.
Should I brita my water then add some gypsum epsom?
or adding sulphur? sodium bicarbonate?
View attachment 5397690this chart is april 2024 and it doesn't show camg levels or caco3
View attachment 5397695this is the only one I could find showing what we need but it's from 2018
I never get any leaves yellowing between the veins described as mg deficiency. The last time I get it I was using Zerowater filter.
With this organic method I stopped buying zerowater filters and just used tap water which bring me issues I never encountered while growing with mineral nutes back in the day. I really love the way I grow now and the harvest quality just want to improve my yields. Providing some plant photos in 4x4 tent
View attachment 5397697at day 42 looking perfect
View attachment 5397698day 55 plant already slow flowering
View attachment 5397699you don't see but stems are purple, pistils withered.
I threw off my ph pen so I can't measure don't know if it's low or high but feeling what im struggling is the same things discussed in this topic.