TY  - BOOK
AU  - R.N. Roy…[et al)
TI  - Plant nutrition for food security:a guide for intergrated nutrient management 
SN  - 92 5 105490 8
AV  - FAO QK 867  P543 2006
PY  - 2006///
CY  - FAO
PB  - Rome
ER  -