This is how I grew my lemons. I started them in jiffy pellets, then into party cups and finally into half gallon grow bags. I wanted to keep them short, they were too short, so I cut the bottom third of the grow bag off and transplanted them into two gallon smart pots and they got to be about thirty inches. I don't use a ppm meter so I can't give you that info. If I remember I gave them a few extra doses of 5-1-1 fish emulsion when in flower, they are good producers and can probably handle a fairly heavy feeding schedule although I have never done that, I'm of the less is more line of thought. I do not know for sure if they will throw off nanners, you'll have to keep a watch a couple weeks into flower and from my experience, not just them but any plant that throws out male flowers, it seems to occur on the bottom third of the plant. Anyway even with all the cramped space for six weeks, when I put them into those two gallon containers and under the hps, when finished they each came in around two or so ounces dry. The second generation, I have no idea at all.
