De or het champignonmest?

The correct Dutch article is:

de champignonmest

How to use champignonmest

the champignonmestde champignonmest
this champignonmestdeze champignonmest
that champignonmestdie champignonmest
our champignonmestonze champignonmest
your champignonmestjouw champignonmest
every champignonmestelke champignonmest
which champignonmest?welke champignonmest?
a big champignonmest / the big champignonmesteen grote champignonmest, de grote champignonmest