The buzz is usually caused by a small piece of the gab that has become detached from the skin underneath but is still held in place by the surrounding pieces. First you need to locate the offending piece, the best way to do that is to hold the drum under direct light and play tune strokes while turning it and focusing your eyes on small areas of the gab. If you look at the gab closely you will notice that it is made up of hundreds of small pieces that fit together very tightly, what you are looking for is one piece that looks like it is vibrating independently from the rest of the gab. In the direct light you can often catch it by seeing the reflection moving, also you can try using a magnifying glass. Another way to find the piece is to play na while turning the drum slowly often you will find that at there is one spot you can play na and there will be no buzz, this indicates that the loose piece is some where along the plain that the ring finger is stopping the vibration of the head 1\4 of the way around from where the index finger is striking (you can mark that place with a pencil and search closely in that area again using the tune stroke). If you find the piece the fix is to put a tiny drop of supper glue right on top of it then let soak in to the cracks around it for about 3 seconds then wipe the excess away with your finger. There may be more than 1 piece that is loose so you may have to repeat the process a few times. Be sure to use absolutely the smallest drop of glue you can, as too much glue on the gab will completely close the resonance of the tabla also don�t try to fix too many spots that will also result in a closed sounding drum which is worse than a buzz. Hope this make some sense.
I don�t know about the rice method but would be interested to hear about it.
the best way to stop it is to locate the bzzing particule , to cook rice strongly , and get the white substance just put a little bit of this in and around the particule .
to locate it hit NA all around the kinar and listen , when the bzzzzzz is not very earable it is that you are near it . You can return the daya and hit head down, you maybe see the particule higher than the other Scuse my english Bye