TY  - BOOK
AU  - Robinsoon,J.B.D.
TI  - The soil nutrogen index and its calibration with crop performance to improve fertilizer efficiency on avable soils
U1  - 631.4 
PY  - 1975///
CY  - England
PB  - CAB.
KW  - Fertilizer
KW  - Soil Fertility
KW  - Soil Nutrogen
KW  - Soil Science
ER  -