:no:
bad practice mate!
water from the top... always!!!
this does a few things:
1 Flushes excess salts to help prevent lockouts
2 insures you dont waterlog the soil as this bcomes a breeding ground for EVERYTHING you Don't want in your grow, fungus gnats, root rot, molds... etc
3 Learn to judge the weight of your pot as a way of determinig the amount of water needed / how dry it is. - to calibrate yourself initially, use the index finger to the second knuckle in the soil about 2 inches from the edge of the pot... push in to second knuckle.... it should feel only slightly moist before you water... if its wet, damp, or very moist, dont water yet.
hope this helps