Navratri Kalash Sthapana Mantra is chanted by those people who keep the Navratri pot as part of the nine day puja. The prayer given below is in Hindi. The lamp lit during Kalashsthapana should use ghee as medium not oil. If you are opting for a full prayer then you should perform the 16-step puja.
Kalash Sthapana Mantra
Apart from the above mantra one should also chant Durga Saptashloki
In Kalash Sthapana, a pot or kalash with an image of Goddess Durga is installed in the house on the day. The pot or kalash is filled with water and is covered with cow dung and seeds (like barely or wheat) are sown on the dung. The pot is kept on a sand bed and seeds are sown on this too.
Special pujas are conducted on the pot and water is sprinkled daily. The seeds sprout and reach about 3 or 5 five inches on the tenth day. They are distributed as Prasad on the Vijayadashami day.