Fertilizer technology in a changing world; Nitrogen production facilities in relation to present and future demand; conversion of ammonia tofertilizer materials; Chemical and physical properties of nitrogen materials and their sphere of usefulness; Phosphate resources and processing facilities; Chemistry and manufacture of superphosphates and phosphoric acid; Chemistry and technology of new phosphate materials; Patash resources in the united states in relation to world supplies; Production and processing of potassium materials; Resources and processing of materials carrying calcium, magnesium, and sulfur; Mechanics of mixed-fertilizer production; Physical and chemical problems in mixed-fertilizer production.