TY  - JA
AU  - Ridley,A.O.
AU  - Hedlin,R.A.
TI  - Crop yields and soil management on the Canadian Prairies, past and present
SN  - No (Revis
U1  - 81-635117 
PY  - 1980///
KW  - Canada
KW  - Fertilizers
KW  - AGROVOC
KW  - Prairies
KW  - Soil fertility
N1  - Summary (Fr);7 ref
T2  - Canadian Journal of Soil Science
ER  -