TY  - BOOK
AU  - Colwell, J.D.
TI  - Computations for studies of soil fertility and fertilizer requirements
U1  - 631.45 L8 
PY  - 1978///
CY  - Slough
PB  - CAB
KW  - J.D. Colwell
KW  - Soil fertility,Fertilizer application
ER  -