hydroponic gardens
 

Hi Ron, I am a novice at this and my results are varied. I'm using a commercial two step nutrient solution in a drip system with perlite and metal halide lights My tomato plants do well until they start to flower, and then the leaves start to turn yellow and curl up, sometimes with brown spots. I thought they were getting too much water so cut back to 2x a day, but from what I read, most other hydroponic gardens get watered much more often. Drainage does not seem to be a problem, but my roots did look somewhat brown last time I pulled a plant...Any suggestions?

If your plants don't continue to produce white roots as they mature but turn brown then you do have a problem. Figuring out the problem isn't so easy. Tomatoes need a lot of light to grow indoors so I would make sure that they are getting it. Watering to much shouldn't be the problem if like you said you have good drainage.
Ron