Need help with deficiency!!!

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As the title says, I'm in a bit of a pickle! Towards the end of last week, some of the lower leaves on my Auto White Widow started to yellow and die. I thought this was just due to them not getting any light through the canopy. I had visitors over the weekend and couldn't give them any TLC apart from a quick feeding on Sunday and it's spread rather quickly to the rest of the plants. I used bubbled water at ph 6.3 and added half strength bloom nutes, approximately a half tsp of epsom salts and a tsp of molasses. I didn't add any nitrogen or veg nutes. The leaves are pale/lime coloured and the tips of the young leaves are burnt. A LOT of the older leaves have died and fallen off! Is this most likely N deficiency or mag deficiency? They are about 2 weeks into flower. Thanks in advance for any help guys!!!
 

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Deficiency Pics

take a look at the link above also i asked the Mod's to move this to the Infirmary see if we can get you some getrite...lol
 
Deficiency Pics

take a look at the link above also i asked the Mod's to move this to the Infirmary see if we can get you some getrite...lol

Thanks CGR! I keep thinking it looks like magnesium deficiency but I've added a little epsom salts to the last 3 or 4 waterings. It's also become worse since feeding bloom nutes so it probably not P or K so maybe N deficiency? The rust spots are throwing me off a bit lol
 
Hey bro, I was about to go to sleep and saw CGR report this post. I will be quick right now but I need some info as well. Will reply back more detailed. That looks a little like Mag but honestly I think it is Potassium. Either way, here is what needs to happen. Flush that plant with proper ph'd water right away. If it is Potassium, it is most likely because it is locked out, if it is Mag it is most likely because it is locked out. In both cases a good flush is in order. With it being this late in flowering you are spot on about no N. Perfect thinking. Did you check the runoff of the ph when you fed?

What you need to do is just like you fed at 6.3 except triple it. Use nothing but water the first two times and slowly water the plant and allow the runoff to flow out of the plant 2 x the pot size. Then on the third watering add 1/2 strength P&K to it and water with it, keep watering and let it run out of the bottom. That should get you back on track. Check the ph of the first gallon or two of runoff just out of curiosity. I would like to know what it was. You can do some foliar feeding as well with some very low strength nutes until your flush takes. The plant will absorb the nutrients through the leaves even though she isn't absorbing through the roots. You need to look at your nutrient schedule to see how to mix that, every manufacturer is different. Probably somewhere are 10% but I am guessing here.
 
I gave them a flush and then used half strength nutes like you said. If it's a calcium lockout due to hard water, will flushing fix it or make it worse? My tap water is very hard. It has 350-400ppm before I add anything. I was using rainwater but I cant gather it anymore without looking suspicious! Bottled water doesnt seem to be much better with a ppm of 250-300. I will update tonight after work if there is any change. Thanks a420er!! :smokebuds:
 
Ph of the first few litres if run off was 6.25 by the way. All plants seem to have problems at various stages but the older ones are the worst. Hope this fixes it!
 
There hasn't been much change in the last 24 hours. The younger plants have grown a bit so that's good. I hadn't time to give them a proper flush after doing the worst affected plants so i just watered with nutes until I had a lot of run off. The three girls in full flower still look really sick. I'm afraid they might not recover now!! One or two lower leaves look a bit like mag deficiency with yellowing between the veins. It's hard to see in the pic but it's clear when looking at the actual plant. Could I have a mag deficiency too? I didn't add any epsom salts after the flush yesterday.
 

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Well, with the ph runoff @ 6.25 we can safely assume that it wasn't your ph that was out of spec. The only other reasonable problem seems to be nutrient lockout from excess salt build up in the soil. What kind of media are you using? Have you flushed it at all up until the flush you just completed? When you flushed this last time and added back P&K did you include any micros or have you just been using molasses and epsom? One thing to keep in mind, the leaves that are damaged are going to stay damaged. What we are looking for is that the problem isn't spreading any longer. New growth looks good on the younger plants, how about the older ones? Have you seen any new growth on them?
 
I'm using plagron soil. It seems to be a popular brand here in europe. The nutes I'm using are also plagron. I have veg nutes, bloom nutes and additives called power roots, pure enzyme and green sensation. I had been adding some roots and enzyme in low doses but not since the flush. I haven't got anything specifically for micro nutrients I think.

I had never flushed before but always watered until I got run off. There is no new growth on the flowering plants but will it generate new leaves now that it's in flower? All the leaves are light green with some being burnt at the tips too. All the older leaves are pretty much dead!

Thanks for taking the time to help. I'm pretty clueless at the moment lol!
 
Hey sean, no prob bud, that is what we do. If that is true soil then you are very bottom end of mag uptake and may not be getting enough. Normally in soil you won't have problems with micros so long as the ph is correct and the soil doesn't get so clogged up with salt build up that it creates lockout. It could be that your ph is just low enough that they aren't getting enough. With you flushing at 6.3 and getting 6.25 that put your soil probably around 6.1. With it being so early in flowering I would use a foliar spray of epsom and that will correct it quickly. Mix one tablespoon or about 15 grams of epsom to 4 liters of warm water to dissolve. Allow it to cool down before applying. About 30 minutes before your lights come on spray the underside of your leaves with a fine mist. Try to get the fans leaves and stay away from bud sites. Don't do it after the lights go out, you want it available right when they wake up and begin taking up nutrients. After that, every time you water or feed try ph your water to 6.8 and try to get about 20% runoff. That should get your ph back up in the optimal range.

a420er-albums-misc-picture218352-ph-vs-uptake.gif
 
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