The experiment was established in the years 2003-2005
on a farm belonging to Mr. and Mrs. Kosakowski in
Raduszyna near Murowana Goślina over a total area of 60
ha. In the years 2008-2013 the investigations were
continued, aiming at the verification of the potential to
reduce rates of mineral fertilisation of selected crops as a
result of poultry dung application. In the investigated farm
in Łopuchowo its chemical composition differed primarily
in the content of organic nitrogen (table 1)