Field purity question

[Delerium]

Was wondering, do fields have a memory of purity?

Example:
Lets say I use 2 humus with salt focus and 15% purity to prep a field, then plant, grow and harvest the crops.
Then I use 2 humus with lead focus and 15% purity to prep that same field, then plant, grow and harvest the crops.

Would the field have a stat memory of the first planting and effect the stats of the second planting, or does purity memory get wiped after each harvest?

[Orlpar]

Purity gets wiped after each harvest, and only the purity of humus applied for each planting matters.

[Delerium]

thanks! that's what I was hoping for....