Hey HempKat - thanks for organizing this informative and helpful thread. I'm on my first grow, day 36 flower. Made lots of mistakes along the way, but learned a lot as well. My lighting is a 150w hps with 2 80w shoplites. I grew my plants way too tall for a 150, so my buds are quite small. Next time I'll adjust that (or buy a higher wattage system). I've had a lot of trouble so far when I see yellowing or spotting of the leaves to figure out whether it is nute burn, a nute deficiency, or pH problems. Early on, I had some yellowing and I overreacted by ferting too much, and three of my babies died (I started with 5). Two lived on, and both ended up female. I later had some pH problems (which I discovered after purchasing a pH pen - great investment!). A few waterings later (with pH adjusted water), I was able to get the pH to a normal range. Here's how my flowering schedule has been so far:
Feb. 25 - transplanted into final pots (3.9 gallons - Fox Farm Ocean Forest soil with 2 cups lime/5 gallons soil)
Feb. 27 - Initiated flowering
Mar. 2 - Plain watering, pH of runoff is 8.4-8.5, too high.
Mar. 5 - Watered with plain, pH adjusted water, got the runoff down to 7.3-7.5
March 9 - watered with tiger bloom and big bloom both at 1/4 strength, runoff is 7.6
March 14 - plain watering, got the runoff down to 6.9-7.1
March 22 - Watered with Tiger bloom and big bloom at 1/2 strength
March 30 - watered with plain water
I've been pretty easy with the nutes and water. My current problem is more yellowing of the leaves - especially on the bigger of my two plants. Pics are below. I haven't tested pH since the 14th - so that could be a problem again. Also, the big plant might be rootbound (roots are poking out the holes at the bottom of the pot). Is it normal for plants this age to start yellowing? Should I even be worried? Could it be a deficiency, and the plant is stealing from the leaves in order to help the buds grow? I'm confused about how to tell whether I've ferted too much or too little. My temps range from 70-80, so I don't think that's causing a problem.