New Delhi, 29 April (NNS): The prices of big cardamom kainchicut improved by Rs 10 to Rs 1640 per kg owing to the unfavourable weather conditions in the Eastern parts of the country. Recently, the prices have gone up in the same ratio. The average auction price rose to Rs 1375/1712 per kg in the last auction which held on 23rd April, due to this, the market sentiments may affect. There is no fear of downfall in the spot big cardamom prices during the coming days.