Nutrient Burn or Defeciency?

Here is the problems I'm having. The plant was doing fine at first, except the top leaves were yellowing and drooping. I thought this was because of the lamps causing them to burn since the bottom new growth was getting very bushy and a nice green as in the pics.

I raised the lamps, but now I noticed the bottom leaves are starting to get yellow at the tips. Any advice or help would be great.

Here is my information:

It's Indoor, I've been keeping it in Veg now for about 3-4 months on a 24 hr light cycle to get it big for enough clones. and until I can get more lights and the room rewired.

I'm growing in a mix of 2 parts Scotts Peat Moss, 1 part Perlite, 1 part Vermiculite and 1 part Scotts Potting Soil

2 HPS 150w lights about a foot from the top of the plant

For nutrients, I have Plant Prod 20-20-20, 10-52-10, 15-30-15, and Miracle Grow 24-8-16 with micro nutes

I water every 2 days with about 250-300ml mixture of the 24-8-16 mixed at 1/2 strength.

What is the room temperature?

Ryder77
plz fill out troubleshooting form so community can assist you proper, Ty

http://boards.cannabis.com/plant-pro...anted-one.html

Quote:

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Originally Posted by SunnyD

What is the room temperature?

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I don't know the exact temperature. The area is in an unfinished basement with crushed stone for the floors and not much insulation, alomost like a huge crawl space or cellar, so it is pretty cool down there...there is a 2' x 5' area that I have wrapped in plastic though to help store the heat like a green house. It's been there for 3-4 months and I just noticed this a couple weeks ago on the top leaves when the bottom started to really grow and bush out.

Cool temps + acid soil (you cannot use peat moss without addition of lime) + too wet= dead.

You need to flsuh your plants well with tap water adjusted to correct the pH (2nd link in my siggy), and then let them get rather dry.
Next, re-pot your plants into fresh light potting soil in slightly larger pots with REALLY good drainage -EXTRA HOLES!!!- immediately, and continue to monitor the pH of your nute solution, which isn't really that great for cannabis. I'd recommend switching to a highly-organic one with humic acid, to help stabilize your pH. MY number one choice would be the Pure Blend Pro line, whcih is designed for cannabis and to be forgiving to a wide range of soils and soilless mixes.

You NEED to knwo your room temp, and keep it between ~72-85 day and no lower than 65 night. If you have to add a space heater, well... you have to add a space heater.

HI :thumbsup:

How close is the light to the plants?

http://boards.cannabis.com/plant-pro...anted-one.html

My Bad!!!! Just looked a pix, didn't read all you said. 2 150W @ 1 Ft.

Sore looks like you are cooking them, but, not likely after reading a bit.

Also after the flush, I would use water, every other feeding. The Miracle Grow
will build up salts real fast, especially every 2 days.

Good Luck

Hi, I have also heard that miracle grow and pot plants don't mix well.

I replanted the plant using ProMix potting soil. Also, the Ph of the tap water wasn't showing anything on the Ph test strips, so I added a couple drops of Optimum Hydroponix Ph+ which brought the water Ph to about 7.0, so hopefully this will bring her back to life and healthy again. Also, I'm using just water now without nutes until things get better.

Any other advice I can use?

What does your room exhaust look like? How is it configured?

I don't have an exhaust system set up yet since it's only one plant that I'm trying to get bigger for cloning. Also, I have to wait to get the room re-wired because any more lights will trip the breaker.