TY  - BOOK
AU  - ROBINSON, J B D
TI  - Soil nitrogen index and its calibration with crop performance to improve fertilizer efficiency on arable soils
T2  - Commonwealth bureau of soils, publication; no 1
U1  - 631.42 
PY  - 1975///
CY  - England
PB  - CAB
KW  - Soil nitrogen
ER  -