TY  - BOOK
AU  - BLACK, C A
TI  - Soil plant relationships
U1  - 631.4:581 
PY  - 1957///
CY  - New York
PB  - John Wiley
KW  - Soil nitrogen
KW  - Soil phosphorus
KW  - Soil plant relationship
KW  - Soil potassium
KW  - Soil science
ER  -