Abstract: The effect of supplemented polyamines in different concentration on germination and seedling growth of rice was studied. The results show that the germination and seedling growth of rice,especially root growth are inhibited by supplemented polyamines. The extent of the inhibition is in the order of spermindine> putrescine>cadaverine. However, they can significantly enhance chilling resistance of seedling growth of rice. The study on the extractibility of cadaverine from alltoclaved soil extracted with water or solution of Na₂EDTA and HCI indicates that most of it will be adverbed by soil. The soil adsorptloll of cadaverine is reversible in the existence of acid and complexing agent.

Key words: Polyamines, Rice, Chilling resistance, Adsorption, Soil, nitrogen level, wheat powdery mildew, intercropping, nitrogen accumulation and allocation