TY  - BOOK
AU  - Colwell, J.D
TI  - Computations for Studies of Soil Fertility and Fertilizer Requirements
U1  - 631.80285 
PY  - 1978///
CY  - England
PB  - Commonwelth Agricultural Bureaux
KW  - Agriculture and related technologies
KW  - Technology (Applied sciences)
KW  - Fertilizers
KW  - Soil fertility
ER  -