Transcript Fertilizer Classifications

Organic and Inorganic Fertilizers
Fertilizer Classifications
• Organics
• Inorganics
– Natural organics
– Super phosphate
– Major animal materials
– Ammonium nitrate
– Synthetic organics
– Ammonium sulphate
– Processed organics
– Ammonium phosphate
Model Agricultural Core Curriculum: Supplement
University of California, Davis
346.T1
Organic and Inorganic Fertilizers
Natural Organics
• Seed meals
– Cotton
– Soybean
• Green manures
– Mustard
– Vetch
– Peas
Model Agricultural Core Curriculum: Supplement
University of California, Davis
• Straws
– Cereals
– Beans
• Forest products
– Barks
– Sawdust
– Humus
346.T2
Organic and Inorganic Fertilizers
Major Animal Materials
• Bloodmeal
• Tankage
• Hoofs and horns
• Manure
– Solid
– Liquid
• Bonemeal
Model Agricultural Core Curriculum: Supplement
University of California, Davis
346.T3
Organic and Inorganic Fertilizers
Synthetic Organics
•
•
•
•
Model Agricultural Core Curriculum: Supplement
University of California, Davis
Urea
Urea-formaldehyde
Biuret
Sulfur - coated urea
346.T4
Organic and Inorganic Fertilizers
Processed Organics
• Sewage sludge
• Processed crop residues
• Cannery wastes
Model Agricultural Core Curriculum: Supplement
University of California, Davis
346.T5
Organic and Inorganic Fertilizers
Organics
• Advantages
• Disadvantages
– Soil tilth improvement.
– Low concentration of
nutrients..
– Water holding capacity
increased.
– Difficult to determine
exact amounts of
– Cation exchange
nutrients provided.
capacity increased.
Model Agricultural Core Curriculum: Supplement
University of California, Davis
346.T6
Organic and Inorganic Fertilizers
Inorganics
• Advantages
• Disadvantages
– Small amount of
– Expensive.
fertilizer needed per
– May burn crop if not
nutrient provided.
used correctly.
– Easy to handle.
– Leaching of nitrates into
– Ability to determine
groundwater.
the exact amount of
– May be toxic to people
nutrient provided.
who apply them.
Model Agricultural Core Curriculum: Supplement
University of California, Davis
346.T7