Kubota - I kept my meyer indoors under a 400w MH grow light last year and fertilized lightly last year with foliage pro, hydrofarm, or whatever I had handy. It grew and grew, and then exploded with blooms in February. I put it outside in my hightunnel in early April and 80 percent of the flowers were now little lemons. Well over a hundred little lemons...and then things went down hill. It dropped leaves, leaves were turning yellow, it dropped most of the little lemons, etc. I thought I was over watering it so I cut back on the water. It didn't improve. I moved it onto the deck for more sunlight and still no difference. Eventually I got fed up and said this thing needs a kick in the ass....I mixed up a handful of miracle grow in a gallon of water and poured the blue juice in the pot. Sure enough about a week later the leaves were greening up. Another shot of the blue juice and things were begining to look slightly better. Since September, I've been hammering the thing with fertilizer that would otherwise kill or burn other plants and the tree is responding, thankfully.
Right now I have it in a sunroom and I've been fertilizing it with just plain old miracle grow about every other week. Everything I've read says use Foliage Pro, but I haven't had a chance to visit my local grow shop to pick some up. Over on GW in the citrus forum, there is a guy named John who is growing Meyer's in Guatamalla commercially. He feeds his in ground trees measuring in lbs, and says you can't overfeed a Meyer. I took his word for it and he's correct. Keep it warm and feed the hell out of it. I ended up with 7 ripe lemons the size of golf balls. Not bad considering all the stress the tree had.