Question 1
Claire wants to start a business of manufacturing phosphorus fertilizers. Which of the following raw materials should be her primary requirement?
◦ single superphosphate
◦ rock phosphate
◦ dipotassium phosphate
◦ urea-ammonium phosphate
Question 2
Hydroxyapatite can be used as a fertilizer in what type of soil?
◦ high P soil (2-14 ppm)
◦ neutral soil
◦ acidic soil
◦ calcareous soil