346.T1

Model Agricultural Core Curriculum: SupplementUniversity 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: SupplementUniversity 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: SupplementUniversity 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: SupplementUniversity of California, Davis

Organic and Inorganic Fertilizers

Synthetic Organics

• Urea

• Urea-formaldehyde

• Biuret

• Sulfur - coated urea

346.T5

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Organic and Inorganic Fertilizers

Processed Organics

• Sewage sludge

• Processed crop residues

• Cannery wastes

346.T6

Model Agricultural Core Curriculum: SupplementUniversity 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: SupplementUniversity 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.