TY  - GEN
AU  - Kaddar T. 
AU  - Russel, D. A. 
TI  - The vital role of potassium fertilizers in tropical agriculture : the present position, furure postential. and constraints to progress/ 
U1  - FOLLETO 0545  
CY  - Estados Unidos de América : 
PB  - International Fertilizar Development Center 
KW  - AGRICULTURA TROPICAL
KW  - ABONOS DE POTASIO
KW  - SUELOS ACIDOS
ER  -