TY  - BOOK
AU  - Havlin, John L  .
AU  - Beaton,James D  .
AU  - Nelson,Werner L  .
AU  - Tisdale,Samuel L  .
TI  - Soil feritlity and fertilizers: an introduction to nutrient management / 
U1  - 631.8 
PY  - 2005///
CY  - New Delhi : 
PB  - Prentice Hall of India Pvt Ltd. , 
ER  -