TY  - BOOK
AU  - Robinson, J. B. D
TI  - The soil nitrogen index and its calibration with crop performances to improve fertilizer efficiency on arable soils
SN  - 085198 340 5
U1  - 631.416/ROB 
PY  - 1975///
CY  - Slough
PB  - Commonwealth Agricultural Bureaux
KW  - nitrogen fertilizers
KW  - soil nitrogen content
ER  -