Yellow Leaves and Other Discolored Leaves

[lorax101]

I am growing hempy style in a 4x4 tent with a 600w light on 12/12. The strain is Grape Stomper x OG and is a 60-65 day strain. I am using dyna gro nutrients at a 2ml grow, 10ml bloom, 4ml protekt, 2ml magpro in RO water, this is about 1200ppm. About a week and half ago I noticed that some of the older growth was yellowing and falling off. I flushed with ro water and the next day started nutes again. Less leaves are falling off now but I have as issue with leaves getting discolored. I'm not sure if it's a P defic or not.
Check out my journal for more detailed info and such.

 

[max316420]

It kinda looks like an N def, are you getting any purpling or blackining on your fan leaves?

 

[max316420]

I knew I read about that type of N def somewhere, heres the info I found about it


Nitrate - Ammonium is found in both inorganic and organic forms in the plant, and combines with carbon, hydrogen, oxygen and sometimes sulfur to form amino acids, amino enzymes, nucleic acids, chlorophyll, alkaloids, and purine bases. Nitrogen rates high as molecular weight proteins in plant tissue.
Plants need lots of N during vegging, but it's easy to overdo it. Added too much? Flush the soil with plain water. Soluble nitrogen (especially nitrate) is the form that's the most quickly available to the roots, while insoluble N (like urea) first needs to be broken down by microbes in the soil before the roots can absorb it. Avoid excessive ammonium nitrogen, which can interfere with other nutrients.
Too much N delays flowering. Plants should be allowed to become N-deficient late in flowering for best flavor.
Nitrogen Deficiencies
Plants will exhibit lack of vigor, slow growth and will be weak and stunted. Quality and yield will be significantly reduced. Older leaves become yellow (chlorotic) from lack of chlorophyll. Deficient plants will exhibit uniform light green to yellow on older leaves, these leaves may die and drop. Leaf margins will not curled up noticeably. Chlorosis will eventually spread throughout the plant. Stems, petioles and lower leaf surfaces may turn purple.

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[napa23]

I would say magnesium, since the veins are still somewhat green. I'm pretty sure that's it, actually. I don't think it's P. I use these 2 website to do my diagnosing. Is there a way you can use regular light so we can see what color the leaves are exactly?
http://www.icmag.com/ic/showthread.php?t=11688
http://www.icmag.com/modules/Tutorials/PlantTrouble/Merged.htm

 

[max316420]

I agree too, if he is in soil and it's peat based then it's possible the peat is breaking down make his soil acidic which is lowering his ph which is causing a mag lockout.. I would have said it earlier but people are saying that I use mag def as the problem to much, but a majority of the time thats what it is. People don't realize how much mag a plant uses during flowering and most food companies just don't put enough in there. He could always sprinkle some lime on his soil to buffer the soils ph

 

[lorax101]

Well the hempy I'm using is 3 parts perlite to 1 part vermiculite. Should I throw some more mag into the mix for tonight's watering and see how it reacts or should I flush first than do that. I will try to get some pictures tonight under normal lighting conditons. The magpro I'm using should be working fine as my ph seems to be good. Also I notice the fan leaves are the ones that are turning yellow and they are also getting the brownish decoloration around the tips. Some of the smaller leaves around the buds are also getting slightly discolored now as well.

 

[Jason2011]

try this
View attachment 1603914

 

[lorax101]

Now that I'm looking more up about magnesium I think that I have a Nitrogen and Magnesium defic caused by bad ph due to adding molasses and that lowering the ph more than I thought it would have. Does this seem plausible.

 

[sparkafire]

Now that I'm looking more up about magnesium I think that I have a Nitrogen and Magnesium defic caused by bad ph due to adding molasses and that lowering the ph more than I thought it would have. Does this seem plausible.

Yes..... Although you being so far along you might not see a drastic improvement other than the stopping of the damage.

 

[lorax101]

Yes..... Although you being so far along you might not see a drastic improvement other than the stopping of the damage.

Yeah, that makes sense. I'm just hoping it doesn't make a large impact on the yield, the buds do look good for just over 4 weeks, I think, it's just the leaves being affected at the moment and am guessing most of these leaves will die off in the last few weeks anyways.

 

[sparkafire]

Well you want to stop it ASAP and you only being 4 weeks there is time to make adjustments so the plant will be feeling good come the last 2 weeks when they put on the most weight. 5/6 weeks and your in a different boat.

 

[max316420]

Does moll lower your ph of water? and if you watered with it wouldn't it lower your soils ph too, Ive tried it a few times and its pretty thick, seems like it would hang around in the soil for a bit. So I wonder how much bud candy would lower it too? I noticed they haven't come out with the ph perfect yet, someone told me they released it too soon and it wasn't working to well so they recalled it

 

[napa23]

It honestly doesn't look too bad, but you need to stop it now. If you flush with pH'ed water and then use a nutrient solution with proper pH, you should be good.

 

[lorax101]

It honestly doesn't look too bad, but you need to stop it now. If you flush with pH'ed water and then use a nutrient solution with proper pH, you should be good.

Yeah that's what I've already done so hopefully it will turn out well but like max said, I'm unsure if the acidity from the molasses is going to stick around in the soil, hopefully the flush rinsed it well enough.

 

[lorax101]

I wasn't able to get normal light on the plant right now but imagine the dark spots on this leaf as a deep purple color, not the brown it looks like because of the light.

 

[lorax101]

Now it's been getting worse. Could this all be from using molasses in hempy. I tried flushing, should I flush again? The colors are off so imagine the leaves as green and the odd color on them to be purple. Ill try to get clearer pictures.

 

[saganist]

There is no way mollasses will do anything but piss your plants off in a hempy bucket. Plants cannot in any way absorb carbs with their roots....period. The only way mollasses is a benefit is if you are doing an organic grow with a microbe based food web in your soil to break the sugars down into a form the plants can use.

 

[lorax101]

Okay so it is a good thing i stopped using them a few weeks back.

 

[lorax101]

Any idea if I should flush them again if they are getting more purple. a Few leaves have died here and there but nothing out of the ordinary, and it's a lot of lower leaves. Only a few upper leaves are dying.