Lemon juice is citric acid!
i use squeezed lemon juice to lower the PH of my water (only for the final flush thou, because it's not a good buffer it wont hold a stable PH value for a long time) and only needed about 13 drops to lower the PH from 8,5 to 6,3 in a 10 liters container, so what i mean is that pure lemon juice into the plants is probably not a good idea! I never tested the PH of lemon juice, but i bet it will round PH of 1 or 2 (very acidic = not good)
if u want a smoke something with a citrus twist , try some Diesel strains (NYC diesel for example) there are many others for sure
but if in name of the science u are disposed to try it be my guest, and please report back what's your results!!