As in chemical fertilizers, the elements P and K in
animal waste, pig slurry, occur in the form available to
plants [6]. On the other hand, N contained in pig slurry
stimulates plant yielding even more strongly than that
introduced with manure [8]. On account of the high fertilizing
value of that animal waste and the necessity to
make it productive, a direct land application happens to
be the most popular method for pig slurry disposal