TY  - GEN
ED  - 
TI  - Soil fertility and organic matter as critical components of production systems : proceedings of a symposium / sponsored by Division S-4, S-2, S-3, and S-8 of the Soil Science Society of America in Chicago, IL, 3 Dec. 1985 
SN  - 0891187820
PY  - 1987///
CY  - Madison, WI, USA : 
PB  - The Society : American Society of Agronomy, 
KW  - Soil management --Congresses
KW  -  Soil fertility --Congresses
KW  - Humus --Congresses
ER  -