TY  - BOOK
AU  - Colwell, J.D.
TI  - Estimating fertilizer requirements: a quantitative approach 
SN  - 0851989055
U1  - 631.8 
PY  - 1994///
CY  - Wallingford
PB  - CAB International
KW  - Fertilizers
KW  - Application
KW  - Soil fertility
N1  - Includes bibliographical references (p.256-259) and index
ER  -