under watered and over fed

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I recently had to leave for work and the day I left I gave them plenty of water. I was gone for 7 days. When I got back they were wilted and very dry. I gave them 1/2 does of onenes 5-9-7 and 1/8 dose of natural bloom 0-10-0. The plants stood back up and had good look to them the next day. The day after 2 of them started having some problems with leaves yellowing and browning, I will post few pics of leaves on here. The others still doing good. The ones affected are The Afghan Kush Ryder and the B.Lee. Running on 400HPS with 20/4. keeping temp around 78, humidity is at 40%. There in 5 gal buckets filled with potting soil. Gave them straight water yesterday incase of nute burn, didnt seem to help. I use rain water half the time and tap water that has set out 36hr the rest. Any suggestions or diagnoses is appreciated.
 
Looks like you have nute lockout.Check your PH and correct that if needed. Give her a small dose of cal-mag and wait untilyou water next and give ner light dose of npk that also has micro nutes in it. It doesn' look like nute burn but if they were that dry and you gave her nutes it might have been to much.Always make sure the soil is a little moist before you give her nutes.
 
I have to agree with namvet.. The closer you plant gets to harvest the more yellow leaves you will have. But in this case, even though your plant is in it's last stages.. You have something going on for sure. I am a little concerned with the drainage of the soil. Personally, I would take that bucket and drill about 50 holes in the side. When you water, you want to soak the soil but then you want it drain fast. Marijuana prefers sand like soil. It likes getting wet but then drying out in the period of 2 or 3 days. And about the yellowing and namvet, you do indeed have a lockout of magnesium. Try a small pinch of Epson salt with your watering. Leave the nutes out for about 10 days and just straight ph-ed water at 5.8. Mag needs lower ph to be absorbed. But the nice thing about mag is that once the plant has it, it tends to keep it. Mag is responsible for cell expansion and is essential for photosynthesis.
 
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