The code prepared by:

Institute of Soil Science and Plant Cultivation

24-100 Puławy, ul. Czartoryskich 8

with participation of:

Institute of Land Reclamation and Grassland Farming

Falenty, 05-090 Raszyn

Institute of Plant Protection

60-318 Poznań, ul. Miczurina 20

in cooperation with:

Danish Agricultural Advisory Centre

Udkaersvej 15, Skejby

DK – 8200 Aarhus N, Denmark

Scientific editors:

Dr Irena Duer, Assoc. Prof.

Dr Mariusz Fotyma,Prof.

Technical editor:

Mr Grażyna Hołubowicz-Kliza, M.Sc.

Cover project and illustration:

Michał Galiński