What is wrong with these Chronic ladies??

[sirharrynuggz]

Hey guys, I have these Chronic ladies from Serious Seeds about 9 weeks old grown from seed. They are showing some signs of deficiency and/or maybe heat stress. I left town for a few days and the caretaker watered with tap instead of RO water, also they had grown pretty close to the bulb in those few days as well, what does this look like to you? Thanks.

 

[Beener2969]

Hi sirharrynuggz
That looks like it's been going on for awhile. I see necrosis and lesions in a lot of places.

Do you know your pH? Have you been using any nutes, if yes...what? You've inspected closely for pests I assume.

The spots on your plants are found in the middle and lower areas, pointing away from light burn. It really looks like a classic Magnesium deficiency. Mg deficiencies are most commonly caused by pH lock out. Low pH's in soil (below 6.0) begin to tie up Mg.

You mentioned that you use an R/O unit. How hard is your water? One watering shouldn't really be enough to cause big issues, but repeated waterings with high concentrations of Calcium in your water will also tie up Mg.

I'm assuming you're in soil, but I couldn't really see by the pics. Always try to include as much info and history as you can. You're going to need that pH answer before you can do much else. If it's a Mg def. caused by pH lockout, adding more to your soil will only make it worse.

Do you adjust the pH of your nutrients before feeding?

 

[sirharrynuggz]

What's up, Been? my pH is usually adjusted to about 6.5, I use Age Old Bloom and some guano and maxicrop occasionally. I was gone for 8 days actually, and when I left they were showing a slight N deficiency (just starting to yellow a little), but I told the person to just give them straight water as I did not want to take the risk of over-fert. No pests to be found. I am in soil, sorry about the lack of info, I figured I could fill in the blanks when asked. I do adjust nutrient solution after mixing, but now I need a new electrode for my pH meter as it dried out and was left that way for a week and is now giving inaccurate readings. Thanks.

 

[Dr. D]

id say ph lock-out also...give em a flush with ur usual water to get the ph back on track(check the run-off) then feed as normal...

 

[sirharrynuggz]

Thanks Doc, I was considering a flush with a product called Mineral Matrix. It's supposed to correct deficiencies such as this and is 100% organic, which I like. Does anyone have any experrience with this product? I will flush today tho with RO water, but I can't get the electrode for my pH meter until next week, so I'll just hope for the best there, If I remember correct tho my RO water comes out at 6.8 so it should be okay.

 

[sparobis]

grab a gallon of tap water...put 1 tblsp of white vinegar in it..stir good and flush the plants

 

[sirharrynuggz]

Thanks for the reply sparobis, but I have pH up & pH down. I think that vinegar thing is like a last resort, prolly not too good for them.

 

[Beener2969]

Thanks for the reply sparobis, but I have pH up & pH down. I think that vinegar thing is like a last resort, prolly not too good for them.

Actually, vinegar is a widely used product in agriculture. It's used for pH adjustments as well as other applications in large farming operations.

It's Acetic acid, 100% organic and diluted to 5%. It works great in soil, but I don't recommend it for hydro. It breaks down into harmless byproducts like water and CO2. This is a case where though it may sound like it...it's not a "home remedy" product. Vinegar can be purchased in quantity from farm and agriculture supply stores.

You really need to use a means to test your pH with vinegar just as you would with any acid. Too much will easily drop your pH out of range. How much you need will depend on your water source. My tap water is 125ppm and a pH of 7.3, it takes approx. 1.75 to 2.0 mls of white vinegar to a gallon of water for a pH of 6.6.

 

[sirharrynuggz]

Cool beens, thanks for the schoolin' beenman!

 

[sparobis]

sorry,
i should have said its used as a soil buffer...my tap water is a consistant 7.5 ph
so, 1 tblsp of vinegar takes my ph from 7.5 to 6.5-6.8....i like my ph around 6.2-6.5 for seedlings.i have zero nute lockouts when ph is in this range

sparo

 

[MynameStitch]

how often are you ferting them with how much water?

there is definatly a ph problem but there also may be a buildup

recently i had this in my grow when there was peat moss in my grow and i went along as my normal feeding and was confused when they was showing spotting like this and then it hit me when ir elized there was peat moss in the soil

im not saying this is with you but when there is overferting involved alot it shows signs like that.....
ph is definatly a problem here

its the ph of the soil is what you want to go by NOT your water ph unless its seriously acidic

you need to ph test the run off water that comes out of the bucket after you water

 

[sirharrynuggz]

I use FoxFarm Ocean Forest soil amended lightly with FoxFarm's Peace Of Mind Bat Guano, I have Age Old Bloom, PBP Bloom, Maxicrop and Nitrozyme. But I just got the PBP and have not used it. I haven't used the Nitro since veg, and I use everything else very sparingly, usually less than half strength. That's why I was wondering if it was just plain underfert. But you're prolly right about my pH being fucked, as I said I can't get a new electrode til next week sometime and mine is fried. Thanks.