TY  - BOOK
AU  - Khasawneh F.E.
AU  -  Sample E.C. Huffman E.O.  Olsen S.R.
TI  - Role of Phosphorus in Agriculture
U1  - 631.8505 
PY  - 1980///
CY  - USA
PB  - American Society of Agronomy
ER  -