Fertilizer Raw Materials and Reserves

3 Measuring and Estimating the Impact of Phosphate Rock Quality Factors.lH 

3 Future Trends in World Phosphate Rock FVoduction.120 

9 Factors That Influence Economic and Commercial Viability of Producing Phosphate Deposits... 124 

3 Sulfur Production From Sulfide Ores and Sulfates.128 

The primary raw materials for nitrogen fertilizers are natural gas, naphtha, fuel oil, and coal. The manufacture of phosphate fertilizers most often requires sulfur and phosphate rock. Naturally occurring potassium salts form the basis of the production of most potash fertilizers. 

---