TY  - BOOK
ED  - American Society of Agronomy. Madison, Wis.
TI  - International and national outlook; the necessity for efficient nutrient utilization
T2  - Special publication
U1  - 631.8 
PY  - 1975///
CY  - Madison, Wis.
KW  - Fertilizantes
KW  - Aspectos económicos
ER  -