1. Introduction
In areas where high volumes of pig (Sus scrofa domesticus) slurries
(PS) are produced, the cheapest solution for their disposal is to
use them as fertilizers to apply to agricultural land. This solution
favors nutrient recycling, although this recycling must be performed
within the framework of preventing underground nitrate
water contamination, which is one of the main issues affecting N
fertilization in Europe (European Union, 2013).