Random dead spots on otherwise healthy seeming plant

Jypsy Dog said:

Start of a Calcium Issue. Could be some P issue also. She's in Flower. Changing your lights back to 18/6. That's NOT A GOOD THING. She's Hungry. Feed her and put her back on 12/12.

Click to expand...

its an auto. i gave 1/2 tsp/gallon nutes last water so i'll have to wait a little longer but i will feed appropriately from now on.

cannetix Inc said:

Its really starting to look like it could be an early stage sulfur deficiency. This tends to show up as light/lime green coloration that progresses from the top of the plant down and also causes the veins to turn yellow early all, unlike N and Mg deficiency. The yellowing veins are especially evident in the last picture. You didn't mention that you use any compost, and decaying organic matter is a primary source of sulfur in the soil, as is the natural sulphuric acid content of rainwater which is obviously something you don't get growing indoors. Sulphur deficiencies are common amongst first-time growers because it is, for some reason, an overlooked element. It is one of the most abundant elements in living organisms and is rarely present in basic NPK fertilizers. It is also highly mobile and more likely to be leached from the soil with heavy watering.

It's really hard for anyone to say without knowing exactly whats in your soil and water. The only way to diagnose deficiencies/excess for sure is to have the soil analyzed or get a ppm meter.

Many micronutrients are absorbed better in slightly acidic conditions but if conditions are too acidic the uptake of sulfur can be disrupted. If your Ph is low and yellowing progresses downward I'd recommend getting your hands on some garden Sulphur or even simply adding a (thin) layer of compost, which cant hurt.

Best of luck!

Click to expand...

ill look into getting me some sulfur, thank you. at first i wasn't ph'ing but now i have been. im usiing jacks classic and bloom booster, and i dont think they have sulfur in them. the leaf in the last picture is the only leaf like that btw. most/all other leaves dont have the deathly look to them as that one does. i dont have a way to analyze my soil and ill be getting a ppm meter soon, just waiting on the finances because i can't drop a ton of money at once. thanks for the help amigo.

greg nr said:

https://www.rollitup.org/t/5-mistakes-most-new-growers-make.899022/

You my friend, have achieved the trifecta of newbie screw ups.

-- too much light
-- too many nutrients
-- too much water

Stop, drop, and roll. Then leave your plants the f' alone. Seriously. Stop foliar feeding. It's an advanced technique and not needed unless you want the last nanogram of product possible. The only thing you should be spraying are IPM mixes.

Let the plants dry out thoroughly before adding more water or nutes. Don'e feed every time you water. Drop your EC or PPM to your light wattage. Keep the lights dimmed down and up high until the plant gets bigger.

Just chill. You are killing them with kindness. Btw, over watering will begin to appear like micro nutrient deficiencies because you are killing your root system. Root rot will quickly kill all the hairs on the root stems and the plant won't be able to take up the nutrients it needs.

The only thing you should add are microbes. I don't care which ones - great white, recharge, soil balance, mammoth p. It doesn't matter, pick one or two and mix it into your waterings. They will help your soil buffer ph and help repair a damaged root system. They aren't nutrients, it's hard to over apply them, so just follow the recommended levels.

Then leave them alone

Click to expand...

I don't think i'm over watering at all. I wait until the soil is dry and the pot is light. probably too many nutrients and definitely too much light, but i don't think i'm over watering. I was foliar feeding with water and 1/4 tsp epsom salt to try to help what seemed to be a Mg efficacy earlier in the grow. the roots are actually growing out the bottom of the pot and i can see the little hairs growing off them, IDK if that means anything but their visible haha. I'll get some microbes, thank you for listing some other brands for me to check out. and you're definitely right i'm being helicopter parent with these guys! ill leave them be. thanks for the advice and ill read that thread you linked too.

I'll keep updating this thread. thanks for the help everyone.

Judging by the photos most of the leaves don't have that many "spots" with the exception of a couple of the larger, older leaves. Any nutrient deficiency can cause necrotic spots to appear especially as the problem progresses, and especially in plants that are more prone to nutrient deficiency in general. Also, remember that nutrient uptake is an interrelated process so a lack (or overload) of one nutrient, especially a more abundant nutrient like Sulphur can affect how the plant absorbs other nutrients. I've seen necrotic spots appear on plants with Sulphur deficiency many times, including cannabis as well as other crops.

What information do you have to support your claim that Sulphur deficiency is uncommon? That's an over-generalized statement, and it's not supported by agricultural sciences which quite clearly indicate that Sulphur deficiency occurs in soils with low organic matter. Since the original poster indicated that he isn't using any compost, and has not inoculated the soil with microbes that would imply low organic matter or slow organic matter decomposition.

http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex3526 "Sulphur deficiency is common, particularly in central and northern Alberta soils, and is increasing."

http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/crop1297 "Soils low in organic matter or cold, wet soil with slow organic matter decomposition are prone to Sulphur deficiency."

"Magnesium is the preferred fix for Sulphur if it were the issue" Magnesium application does NOTHING to improve Sulphur content of the soil. I believe you are probably referring to Magnesium Sulphate or "Epsom salt". There is more than one option for Sulphur fertilization. I merely suggested Sulphur because it's what I have experience with and I prefer it over Epsom which is easier to misuse.

cannetix Inc said:

Judging by the photos most of the leaves don't have that many "spots" with the exception of a couple of the larger, older leaves. Any nutrient deficiency can cause necrotic spots to appear especially as the problem progresses, and especially in plants that are more prone to nutrient deficiency in general. Also, remember that nutrient uptake is an interrelated process so a lack (or overload) of one nutrient, especially a more abundant nutrient like Sulphur can affect how the plant absorbs other nutrients. I've seen necrotic spots appear on plants with Sulphur deficiency many times, including cannabis as well as other crops.

What information do you have to support your claim that Sulphur deficiency is uncommon? That's an over-generalized statement, and it's not supported by agricultural sciences which quite clearly indicate that Sulphur deficiency occurs in soils with low organic matter. Since the original poster indicated that he isn't using any compost, and has not inoculated the soil with microbes that would imply low organic matter or slow organic matter decomposition.

http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex3526 "Sulphur deficiency is common, particularly in central and northern Alberta soils, and is increasing."

http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/crop1297 "Soils low in organic matter or cold, wet soil with slow organic matter decomposition are prone to Sulphur deficiency."

"Magnesium is the preferred fix for Sulphur if it were the issue" Magnesium application does NOTHING to improve Sulphur content of the soil. I believe you are probably referring to Magnesium Sulphate or "Epsom salt". There is more than one option for Sulphur fertilization. I merely suggested Sulphur because it's what I have experience with and I prefer it over Epsom which is easier to misuse.

Click to expand...

Damn you like to rattle on....http://www.ilovegrowingmarijuana.com/marijuana-nutrient-deficiency-sulfur/

Hope this thread is helping you amsterdam11

Jypsy Dog is giving you good advice.

cannetix Inc sounds like someone who can grow vegetables and may be really smart but I don't think he has much experience with weed, but go look into sulphur if you want too.

chemphlegm gave you two posts with solid advice on page one.
One was don't water and let it dry out, yet 3 days later you watered and 3 days after that you flushed. SMH!
You are not likely to stop overwatering or adding all kinds of remedies for a while. No worries, it takes a few years to figure it out sometimes. You will get there.

The plant pictured was the size of the seedling shown below when it was transplanted 20 days ago. It is in a 3 gallon plastic pot, not the same as a smart pot, but smart enough to grow this plant with 11 blade fan leaves after being watered one time with 3 cups of RO water 10 days ago. All I did was water it once since it was transplanted into the 3 gallon pot.

Can't edit the post above. It was 6 cups of RO not 3 cups.

Hello updating this. There seems to be a 100 and one things to do to try and fix my plant and I've read every reply in this thread, so thank you to everyone who has helped me out! I gave the plant some water since my last update and that's it. No nutes or sulfur or whatever. I'm just gonna ride this grow out and try to keep the plant for commiting suicide until harvest now. The smaller plant started flowering and has gotten huge. Just gave that guy some water and the beneficial bacteria sample I got on it's last watering, I forgot to give it to the pineapple. Anyways here are some pics. I'll update again in a few days. Thanks for all the help everyone.