1. Chapter 5: Fertilizer – A Source of Plant Nutrients Fertilizer = Any material containing one or more of the essential nutrient that is added to the soil or to plant foilage for the purpose of supplementing the plant nutrient supply.

2. Types of Fertilizer Simple Nutrient – Containing only a single nutrient. Multi-Nutrient – Referred to as mixed or complex fertilizers. (can be blended or homogeneous)

3. Anhydrous Ammonia NH 3 82-0-0 Is combined with hydrogen Very energy intensive Ammonia is absorbed readily Injected in soil

4. Aqua Ammonia NH 4 OH 20-0-0 Dissolved in water Vapor pressure is low so can apply it with lower cost equipment Injected in soil or water

5. Ammonia Nitrate NH 4 NO 3 34-0-0 Reacting nitric acid with anhydrous ammonia Prilled granulated or coated Applied by broadcast or drill

6. Ammonia Nitrate - Lime 26-0-0 Contains Calcium Carbonate (40% limestone) Same ways to apply as Ammonia Nitrate

7. Ammonium Sulfate (NH 4 )2SO 4 21-0-0-24S Contains 24% sulfur Made by reacting anhydrous ammonia with sulfuric acid Apply by drill or broadcast

8. Calcium Nitrate 5Ca(NO 3 ) 2 +NH 4 NO 3 15.5-0-0-19 Ca Product of Nitric phosphate+phosphate ore and ammonia Final product is white granular product

9. Nitrogen Solutions Dry mixes in solution are used to enhance nitrogen availability AN-20 Ammonia Nitrate UAN-32 urea ammonium nitrate CAN-17 Calcium nitrate ammonium nitrate Salting out

10. Urea CO(NH 2 ) 2 46-0-0 Highest percent N of all dry fertilizers CO 2 bubbled in Ammonia (pressure and temperatures) Highly water soluble Used in bulk blends

11. Nitrogen Solutions Pressure or non pressure – Pressure solutions have more free ammonia than the solution can absorb, thus it must be contained in vessel. AN-20, UAN-32,and CAN 17

12. Single Superphosphate Ca(H 2 PO 4 ) 2. H 2 0 + CaSO 4. 2H 2 0 0-20-0 Produced by reacting sulfuric acid with finely ground phosphate rock. Highly insoluble

13. Triple Superphosphate Ca(H 2 PO 4 ) 2. H 2 0 0-45-0 Produced by reacting phosphoric acid with finely ground phosphate rock.

14. Ammonium Phosphate Monoammonium phosphate (MAP) 11-52-0 Diammonium Phosphate (DAP) 18-46-0 Ammonium Phosphate Sulfate 16-20-0-15(S) Tech – higher grades of MAP & DAP, 12-61-0 and 21-53-0. Liquid forms – 8-24-0, 9-30-0, 10-34-0, & 11-37-0

15. Potassium Chloride KCL 0-0-60 Known as Muriate of potash (MOP) Least expensive so most commonly used.

16. Potassium Sulfate K 2 SO 4 0-0-52 Sulfate of Potash (SOP) Used in crops that are subject to chloride toxicity or where K & S are deficient.

17. Mono Potassium Phosphate KH 2 PO 4 0-52-34 MKP Useful dry or liquid

18. Potassium Magnesium Sulfate K 2 SO 4. 2MgSO 4 0-0-22-11Mg- 22S Does not contain chloride

19. Potassium Nitrate KNO 3 13-0-45 Water soluble fertilizer for injection in irrigation systems & foliar sprays.

20. Organic Fertilizers Types?

21. Controlled Released Fertilizers Why?