If someone been cremated on land which is being used for agriculture and work, how to purify the land to remove any negative energies and effects? Wiccan or any ritual ? Please help.

Have there been negative reports? Considering all the soldiers and civilians who have been literally cremated during wars on our planet, much of the earth should be a mass of negativity.

Yeah I know. Let's just say I'm entering in new house or place, its for peace of mind. Do you know any such ritual ?

yeah I know. let's just say I'm entering in new house or place, its for peace of mind. do you know any such ritual ?
Ask a local minister or priest to bless the property. If you aren't Christian, ask a holy person who is associated with your religion.

I don't agree with the premise that land that has had cremation on it needs to be purified.
Where does this come from? A religion or a sense of your own that a place has negative associations?

My sense, anyway guys I'm just asking any ritual you know.