TY  - BOOK
TI  - Assessment of soil nutrient balance;approaches and methodologies
U1  - 631.41:631.811 P3 
PY  - 2003///
CY  - Rome
PB  - FAO
KW  -  R.N. Roy and others
KW  - Roy, R.N. et al
KW  - Soil science,Soil nutrient balance,Soil nutrition
ER  -