Evaluation of Scratching Effect of Potassium Nitrate, Jasmonic Acid, Gibberellin and Wet Cold Stratification on Cobra Germination Evaluation of Scratching Effect of Potassium Nitrate, Jasmonic Acid, Gibrin and Cold Stratification on Germination of Dehydration Acid, gibberin and wet stratification on cobra germination Evaluation of the scratching effect of potassium nitrate, jasmonic acid, gibberin and wet stratification on cobra germination