TY  - BOOK
AU  - Robinson J.B.D.
TI  - Soil Nitrogen Index & its Calibration with Crop Performance to Improve Fertilize
T2  - Commonwealth Bureay of Soils Special Pubc. No.1.,ODM Gift-Br
U1  - R/631.4016 ROB-S 
PY  - 1975///
CY  - England
PB  - CAB
ER  -