Chemical Method
Seed tubers (whole with few cuts or cut seed) should be dipped in solution containing 1% thiourea and 1ppm GA for one hour. These tubers are then heaped over an inverted basket below which 3% ethylen chlorohydrin is kept. The heap is covered by gunny bags etc to prevent the ethylen chlorohydrin vapours to go out. The seed tubers are thus exposed to the vapours for 24 hrs. After 24 hrs the tubers are removed and kept for chitting .Precautions
Ethylen chlorohydrin is poisonous and its vapours should not be inhaled. Therefore proper care has to be taken.Method of preparation of GA and thiourea solution:
For 20 lt. solution 200 g thiourea and 20 mg GA is required. The GA is first dissolved in a bottle alchol/spirit and then this solution is mixed in the required quantity of water. To this the required quantity of this urea is added and shirred throughly. 20 lt solution is sufficiant for 40 kg of seed.