newbee question

[dogboy123]

I have 3 carmelicious, indoor, planted 8/1/10.
From day 1 they have been on a light schedule of 12 hrs on, 12 hrs off.
Am fertilizing with Jacks Classic Blossom Booster 10-30-20 and Jacks All Purpose 20-20-20. I use both ferts at the same time when watering.
One plant seems to have gotten too much fert, lots of yellow splotches in leaves, the other 2 seem to be doing well, lots of flowering and tall, good growth.

A few q's:

- I recently read about the light being on more in the beginning
(like 16-8) and then reducing it, but I have used 12 on, 12 off from the start, any problem with this?
Does this increase the time it will take until harvest?
At some point should I cut the light back or leave it like this till finished?

- Should I have been using or should I be using both of those ferts at the same time?

- The plant that got fert burn, I flushed well with water.
Will that plant be ok? Quite a few of the fan leaves have yellow spots all over them, but not all of them.
Should I use any more ferts on that one or just water only until harvest?

Any other suggestions?

[keylime]

When you have a plant at 12/12, that just means you started the plants in flowering mode. That means you are not giving them time to vegetate, but start flowering. If you had a mother, it would be on 16/8 (generally) and all it would do is grow and grow, but will never flower until it gets the signal its fall time which is 12/12.
Your plants do not have time to grow and so they will be smaller when they finish than if you had them at 16/8 for a month (which is typical) before going to 12/12. However, even when in flowering, they will still grow 2 to 3 times the size by the time they finish.
Nutrient burn generally looks like the edges of the leaves are burnt, not the whole leaf. I suspect your yellow leaves are quite natural, since they have been flowering for 2 months, and depending on the strain are getting close to the end of their lifespan. I picture would help in that matter.

keylime