I would say that what you're doing should be fine, if you want to increase your jump add plyometrics (either on a separate day from lower body or in the same session). If you are training for sport, obviously other practice is needed - if you are training specifically for sport on a regular basis then conditioning/GPP should be covered by this.
The only thing to watch would be lower back fatigue from rowing, but if you're squatting and deadlifting just once per week you should be ok.
If you want more specific advice you need to post stats (lifts, diet, height, weight, full goal, etc.)
Also realise that fat gain can be avoided without any endurance or fitness type training: eat the correct amount based on previous results, and keep a log so you actually know how much you are consuming (!)