plants yellowing at impressive speed.

Hi there! Yet another plant problem. This time I'm pretty sure its not ph, haha.

Temps are around 78 pretty consistently spikes to 80 on hot days.
Light is a 400w hps.
Decent air circulation in an open room.

*nutes- so far they have been running on just promix ammended with blood/bone meal and desert bat guano. I feel this is the problem (underfeed) because I havent given them any bottled feed yet and they are somewhat big for their pots.

So like the title says I have a couple plants here that I wanted to put into flower but in the last 4 DAYS they have gone from a beautiful green to a pretty bad yellow. Most of the yellowing is on top but on the lower leaves I have some splotching. Also what looks to me like interveinal chlorosis inthe top leaves.

Here are some ppics. The plant that is obviously less healthy is one of the ones in question. Under hps it looks bright yellow but my camera sucks so I put a healthy plant of a diffwrent strain next to it because they had rhe same colour four days ago.

I'm thinking underfeeding leading to defiency of a couple possible micronutrients such as iron or sulphur or magnesium maybe.
I'm really interesred to hear what you guys think? And could underfeed produce problems so quickly?

Thanks for reading all thoughts appreciated!

for sure hungry, and I bet you are watering with distilled water.

I'm actually watering with well water that has an unadjusted ph of 7.5 (that I fix) , hardness of 3 grains and is somewhat high in manganeese.
What made you think I used distilled water if I may ask?
Thanks foe the speedy response btw

caveman117 said:

I'm actually watering with well water that has an unadjusted ph of 7.5 (that I fix) , hardness of 3 grains and is somewhat high in manganeese.
What made you think I used distilled water if I may ask?
Thanks foe the speedy response btw

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same symptoms as all the noobs who think they should use distilled water. When one nute becomes deficient, all other nutes follow.

definitely sounds like a micronutrient. Zinc or Iron in the tops, and the splotching in the lower leave could be the Mg breaking down.

do you know what your soil Ph is? How much of the blood/bone/guano did you put into how many gallons of soil? how long has the plant been in its container and what size is the container? I'm betting your soil Ph is off, this is what leads to most nutrient deficiencies.

Chuck that chart makes a lot of sense with things ive seen happen in other grows of my own and others. Thanks fpr.posting it! Ive seen it befpre but just didnt want to get into it at the time.

And shluby. My medium ph is right around 5.8ish. Added 1.5 cups blood meal, 1.5 cups bat guano, and 2 cups bone meal. To a bale of pro mix (3.8 cubic feet). I figured that was.pretty light. And all the water that goes in is around 6.0-6.3.

Pot size is a 2.5 gallon pot with probably 2 gallons of mix in it. And the plant is about 1.5 months old maybe

caveman117 said:

Chuck that chart makes a lot of sense with things ive seen happen in other grows of my own and others. Thanks fpr.posting it! Ive seen it befpre but just didnt want to get into it at the time.

And shluby. My medium ph is right around 5.8ish. Added 1.5 cups blood meal, 1.5 cups bat guano, and 2 cups bone meal. To a bale of pro mix (3.8 cubic feet). I figured that was.pretty light. And all the water that goes in is around 6.0-6.3.

Pot size is a 2.5 gallon pot with probably 2 gallons of mix in it. And the plant is about 1.5 months old maybe

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when did you put them in that pot? if they've spend their whole life in it... plant is going to need transplanted if you're not past week 4 of flower. general rule of thumb 1 gal of medium = 3 to 4 weeks of growth.

what were the recommended amounts to add??? 1 cubic ft = ~7.5 gallons 1 cup = 16 tbsp so if mixed well your ratio is ~3tbsp per gal of soil which is 6tbsp in your pot and actually could be a strong mix as those can be strong products. if you have to transplant i would recommend not using a high nitrogen recipe, should be something like 2-5-4 or 5-12-8 or something of a similar ratio for flowering. I would also like to add that you probably dont have a complete nutrient profile with just those three products but i could be wrong. i would think you're missing micro nutrients so maybe try adding a Kelp meal next mix.

if your soil Ph is as low as low as you say you need to get it to 6.5. your green is breaking down in the oldest leaves first and the plant is definitely so dark that you for certain have Nitrogen. I'm almost wondering if you are experiencing Nitrogen toxity... you do have a little bit of clawing in one pic i see and they are quite dark in the picture. http://www.growweedeasy.com/nitrogen-toxicity-cannabis

to fix the Ph, you need to get some high quality fine dolomite lime and topdress a couple tablespoons into your soil and mix it into the top inch or two and water that in, or you can make a solution with the dolomite to water in as well but with the fine stuff i find it unnecessary as it waters in easy. The lime with correct your Ph to 6.5 which is the most desired Ph for cannabis in soil. Magnesium is LEAST available for uptake at 5.8 soil Ph. At 6.5 Ph and above Magnesium is MOST available. Look at the Ph availability chart. Calcium is best available at 6.5, and Cannabis loves readily available calcium and it greatly benefits nutrient uptake, cell wall strength, and sturdy stems. The dolomite is composed of calcium and magnesium, but from what i read they like a little extra calcium so i'm going to supplement a small amount to my soil mix

Looks like a heat stress issue. Is that one too close to the light?

The pro mix is all peat moss/perlite and I was under the impression I need a lower ph with it than a true soil.

This plant and the other one in my room with the same symptoms have been being very finicky about temp the last few days. Seem to be getting too hot when they shouldnt be and the healthy ones aren't showing signs of heat stress in my opinion.

Also they are in veg still jist to clarify and I had planned on using bottled nutes to feed after soil ran out but I just wasnt really seeing signs of them needing anything and then all of the sudden reaally yellow really fast.

caveman117 said:

Chuck that chart makes a lot of sense with things ive seen happen in other grows of my own and others. Thanks fpr.posting it! Ive seen it befpre but just didnt want to get into it at the time.

And shluby. My medium ph is right around 5.8ish. Added 1.5 cups blood meal, 1.5 cups bat guano, and 2 cups bone meal. To a bale of pro mix (3.8 cubic feet). I figured that was.pretty light. And all the water that goes in is around 6.0-6.3.

Pot size is a 2.5 gallon pot with probably 2 gallons of mix in it. And the plant is about 1.5 months old maybe

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Mixing blood meal and bat guano in your soil without composting it all first can lead to negative results both of those can be to hot for your roots if not composted before hand
its hard to tell if thats your problem or not idk what blood meal or bat guano you used but be very careful adding raw materials to your soil most bottles of liquid nutes probably only have small amounts of this stuff in them tablespoons at most

there's nothing wrong with distilled water. you just have to add enough fert to make up for what's missing.

If by composting you mean letting it cook than yes it sat for about three weeks before use and kept moist. Probably been about two and a half months now since it was mixed.

I'll pull em out and take some more pics in a few minutes for an update.
To me they dont look much different.

I dropped the ball on posting new pics haha but they are lookingmuch better and mich more green. All I did was rake em out of there pots and added anpther gallon of the same mix to them.