What the hell is this deficiency?

sorry to add to the thousands already started to that effect but I'm at my wits end nothing helps.
I am into the fourth week of flower and I have two FS Pure AK that are look like I cant bring them back.

This is my first grow and the soil is 50% FFOF and 50% Happy Frog in 5 gal pots, I have been using the Roots Organic complete line and following their 5ML schedule.The AK's have always shown a little deficiency but has got progressively worse since I flipped em.

Admittedly I have not been Ph'ing my water but I know my tap water usually PHed at 7 when I had my pool up so I figured I was good. Well my buddy gave me his PH pen so I checked it (using distilled water now) started at 6.8 and by the time I added all my nutes (Budda grow,bloom,trinity,serene,big swell, and 5ML cal mag) Ph dropped to 4.7 and even though I know my buddy only uses drops to bring his up mine reguired about 10ML per gallon to bring it back up to 6.8. well this made these way worse so next watering was 5.2 ish going in I did no Ph up and checked my runoff for the first time it was about 4.5

How do I bring the soil up? Is it ok to flush these this late in flower? how would I got about that? any help would be appreciated

maybe phosphorus or zinc. check this link. GL

http://www.420magazine.com/forums/problems-pests-disease-control/81275-cannabis-plant-pest-problem-solver-pictorial.html

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yea looking at that it kinda looks like a manganese def. Anybody have any thoughts?

I'm just wondering how to stabilize the PH of my soil. I am not sure about those probe soil testers should i trust those

Leaf tips & margins curling up means the plant is trying to retain moisture. Could this be an environmental problem? Wind burn? Lights too close? Not enough air exchange?

1000 watt light is up about as high as i can get it and its about 24 inches away in a cool tube with a 6 in fan pulling air thru out of the tent into a big ass filter two small clamp on fans keeping air moving across conopy

oh yea its a 4x4 tent too 4 pure ak's and one power flower all topped and bushy

This looks like low pH to me. Normally I'd recommend limestone to bring the pH up in soil, but in this case I'd recommend potassium hydroxide (usually in pH up) or wood ashes.

mountain dweller said:

sorry to add to the thousands already started to that effect but I'm at my wits end nothing helps.
I am into the fourth week of flower and I have two FS Pure AK that are look like I cant bring them back.

This is my first grow and the soil is 50% FFOF and 50% Happy Frog in 5 gal pots, I have been using the Roots Organic complete line and following their 5ML schedule.The AK's have always shown a little deficiency but has got progressively worse since I flipped em.

Admittedly I have not been Ph'ing my water but I know my tap water usually PHed at 7 when I had my pool up so I figured I was good. Well my buddy gave me his PH pen so I checked it (using distilled water now) started at 6.8 and by the time I added all my nutes (Budda grow,bloom,trinity,serene,big swell, and 5ML cal mag) Ph dropped to 4.7 and even though I know my buddy only uses drops to bring his up mine reguired about 10ML per gallon to bring it back up to 6.8. well this made these way worse so next watering was 5.2 ish going in I did no Ph up and checked my runoff for the first time it was about 4.5

How do I bring the soil up? Is it ok to flush these this late in flower? how would I got about that? any help would be appreciated

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you have no lime in the soil, the FFOF uses powdered oyster shell to buffer which IMO doesn't last long enough, the happy frog uses dolomite and oyster shell . You no longer have enough lime to buffer the soil and the pH has dropped because of built up salts and or nutrients in the medium
to fix you will run water through slowly until the runoff pH is the same as the water going in (doesn't matter what pH is..) Keyword: Flush***
then you adjust the pH and go half dose nutes, until runoff PPM or pH is the same as water going in. From here on, you leech*** the soil monthly if needed and the water going into the soil will govern pH. The leeching will reduce salt buildup and keep burn to a minimum
after this, you shouldn't have to water for a while. You need to be careful about watering because you just flushed the plant and are drowning the roots. I usually have a fan oscillating towards the soil when i flush the plants , and also i use fabric pots so i think it helps reduce shock.
this is the only proper way of "flushing" it is something you do to fix a mistake. Leeching is done as a maintenance thing to keep salts in the medium down

next run try straight happy frog and after transplanting going straight to flower, or add in some lime . I think you can add up to 1 tbsp/gal of lime , i',m not positive though.

Leech: 3x the medium size of water ran through the planter slowly (ex 5 gal gets 15 gallons)
Flush: at least 5x the medium size of water ran through planter slowly (ex 5 gal gets at least 25 gallons)

Damn thanks that's kinda what I thought but don't know how to go about fixing it just don't wanna kill em they are too close

So is it safe to use that much base to bring my PH back up after adding my nutes?next time I'm gonna mix them and let let them sit 24 hours and see if that brings it back up a little.

churchhaze said:

This looks like low pH to me. Normally I'd recommend limestone to bring the pH up in soil, but in this case I'd recommend potassium hydroxide (usually in pH up) or wood ashes.

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How would I apply it just sprinkle on the surface and water?

Always mix and let sit for 24hrs.

I find that right after I mix my nutes my and test ph it's 4.7ish. I can add ph up if I'm watering my plants right then, but I found that is not the best thing to do. If I let it sit out overnight and add NO ph up, it's usually 5.5-5.8 when I test it 24hrs later. I always mix anything I'm going to use at least 12hrs before.

First of all, I agree with Nizza that you should ALWAYS add lime to fox farms soil for the same reasons that he stated. Just sprinkle some of the pellets on the surface and water once a month. However, your problem looks more like severe nute burn to me than anything else. Cut off nutes completely for a week and then begin giving a 1/3rd dosage, many strains cannot take the recommended dose.

kagecog said:

First of all, I agree with Nizza that you should ALWAYS add lime to fox farms soil for the same reasons that he stated. Just sprinkle some of the pellets on the surface and water once a month. However, your problem looks more like severe nute burn to me than anything else. Cut off nutes completely for a week and then begin giving a 1/3rd dosage, many strains cannot take the recommended dose.

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Never really gave nute burn a thought since this strain is supposed to be able to handle more nutes than others, plus I have read it is hard to burn them with organics. all the bottles on the Roots Organics line say 10ml and up and I have been following the 5ml schedule which is a little lower than what the individual bottles say but I have no experience with them so I'm still learning

mountain dweller said:

Never really gave nute burn a thought since this strain is supposed to be able to handle more nutes than others, plus I have read it is hard to burn them with organics. all the bottles on the Roots Organics line say 10ml and up and I have been following the 5ml schedule which is a little lower than what the individual bottles say but I have no experience with them so I'm still learning

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In my opinion, its just as easy to burn them with organics as it is synthetic fertilizers. Usually, I recommend giving half the recommended dosage. Cannabis is a weed, it does not require a lot of nutrients for optimal growth. If you ever see leaves beginning to curl and leaf tips beginning to turn brown, immediately cut off nutrients.

All this started with the upper leaves turning pale then brown spots appeared leading to necrosis as seen now all my other ones are starting to have the same symptoms,so last night I ran 15 gallons of 6.8 PH water through each pot the last gallon with very mild nutes and a little cal mag. trying to stop the rest of them doin it but even the ones in the pic are still frosting and growing