1. Sources of N, P and K Brad Lubbers Topic # 2033

2. Introduction Nitrogen, Phosphorus and Potassium Common forms taken up by the plant Early forms of phosphorus Commercial fertilizers Nitrogen fixation

3. Nitrogen Ammonium Nitrate (NH 4 NO 3 ) Reaction between Nitric Acid (HNO3) and Ammonia (NH3) 34 percent nitrogen

4. Nitrogen Ammonium Sulfate ((NH 4 ) 2 SO 4 ) 24 percent sulfur 21 percent nitrogen Produced by reaction between Ammonia (NH 3 ) and Sulfuric Acid (HSO 4 )

5. Nitrogen Urea 46 percent nitrogen Produced by reaction between Ammonia (NH 3 ) and Carbon Dioxide (CO 2 ).

6. Nitrogen Fixation Biological process performed by legumes (alfalfa and soybeans) which converts Nitrogen gas (N2) from the atmosphere into amino acids and proteins Symbiotic relationship between plant roots and bacteria

7. Phosphorus Apatite Basic source of Phosphate fertilizer Treated with heat and acids in fertilizer production making it soluble in the soil solution

8. Phosphorus Superphosphate (P 2 O 5 ) Rock phosphate treated with sulfuric acid 16 to 30 percent phosphoric acid (P 2 O 5 )

9. Phosphorus Liquid Phosphoric acid (H 3 PO 4 ) Apatite treated with sulfuric acid 40 to 50 percent (P 2 O 5 )

10. Phosphorus Triple Superphosphate Apatite reacted with phosphoric acid 44 percent (P 2 O 5 )

11. Potassium Early forms Animal manure Plant and animal residue Ground bones Wood ashes

12. Potassium Potassium Chloride (KCl) Potassium Sulfate (K 2 SO 4 ) Potassium Nitrate (KNO3)

13. Questions