346.T1 Model Agricultural Core Curriculum: Supplement University of California, Davis Organic and Inorganic Fertilizers Fertilizer Classifications Organics –Natural organics –Major animal materials –Synthetic organics –Processed organics Inorganics –Super phosphate –Ammonium nitrate –Ammonium sulphate –Ammonium phosphate

346.T2 Model Agricultural Core Curriculum: Supplement University of California, Davis Organic and Inorganic Fertilizers Natural Organics Seed meals –Cotton –Soybean Green manures –Mustard –Vetch –Peas Straws –Cereals –Beans Forest products –Barks –Sawdust –Humus

346.T3 Model Agricultural Core Curriculum: Supplement University of California, Davis Organic and Inorganic Fertilizers Major Animal Materials Bloodmeal Hoofs and horns Bonemeal Tankage Manure –Solid –Liquid

346.T4 Model Agricultural Core Curriculum: Supplement University of California, Davis Organic and Inorganic Fertilizers Synthetic Organics Urea Urea-formaldehyde Biuret Sulfur - coated urea

346.T5 Model Agricultural Core Curriculum: Supplement University of California, Davis Organic and Inorganic Fertilizers Processed Organics Sewage sludge Processed crop residues Cannery wastes

346.T6 Model Agricultural Core Curriculum: Supplement University of California, Davis Organic and Inorganic Fertilizers Organics Advantages –Soil tilth improvement. –Water holding capacity increased. –Cation exchange capacity increased. Disadvantages –Low concentration of nutrients.. –Difficult to determine exact amounts of nutrients provided.

346.T7 Model Agricultural Core Curriculum: Supplement University of California, Davis Organic and Inorganic Fertilizers Inorganics Advantages –Small amount of fertilizer needed per nutrient provided. –Easy to handle. –Ability to determine the exact amount of nutrient provided. Disadvantages –Expensive. –May burn crop if not used correctly. –Leaching of nitrates into groundwater. –May be toxic to people who apply them.