You can effectively work your lower lats for full back development by using Low Pulley Rows with a close-grip handle. Pull into your lower abs really focusing on flaring your lats out at the point of peak contraction.
The whole key to this exercise is to concentrate on pulling with your lats as opposed to your arms. To get a sense of the proper form, warm up with a very light weight, stretch the lats fully forward, and begin the motion by pulling only your lats back . . . don’t even bend your arms until you’ve pulled your lats back as far as possible.
As with other exercises—and lat exercises in particular—it’s a good idea to vary your hand positions and grip widths from to time. I like to use not only a palms facing each other grip with this exercise, but also an overhand grip and even, occasionally, an underhand grip.