Manures and Fertilizers
Types of Fertilizers :
—Complete
—Incomplete
—Organic
—Inorganic
—SolubleStraight.
—Mix.
—Insoluble
Straight Vs. Mix-
—Straight fertilizers contain single nutrient in it as that of Urea contains only Nitrogen (N) @ 46 % OR Single Super Phosphate (SSP) contains only Phosphorus (P) @ 16 %.
—Mix fertilizers contain 2 or more nutrients like that of Di-ammonium Phosphate (DAP) contains 18 % Nitrogen (N) and 46 % Phosphorus (P).
Complete vs Incomplete
—Complete has all three primary nutrients-nitrogen phosphorous & potassium
—Examples: 10-10-10, 15-30-15, 20-5-20
—Incomplete DOES NOT have all three primary nutrients
—Examples: 20-0-0, 0-20-0, 12-0-44
Organic Fertilizers
—Comes from plant or animal matter and contains carbon compounds
—Examples: urea, sludge and animal tankage.
Advantages of Organic
—Slow release of nutrients
—Not easily leached from the soil
—Add organic components to growing media
Disadvantages of Organic
—Hard to get
—Not sterile
—Low nutrient content
—Expensive
Inorganic Fertilizers
—Comes from sources other than animals or plants
—Chemical products
Advantages of Inorganic
—Can make the desired ratio of nutrients
—easy to get
—lower cost
Disadvantages of Inorganic
—No organic material
—possible chemical building up in growing media
Soluble Fertilizer
—Dissolve in water and are applied as a liquid solution
—Fertigation
—fertilizing through irrigation water
—big advantage
Insoluble Fertilizer
—Includes granular and slow-release applied to the growing media
Granular vs. Slow Release
—Granular
—relatively inexpensive
—easy to find
—Slow Release
—more expensive because it is coated
—more uniform release of the nutrients overtime period
Fertilizer Analysis
—Fertilizer analysis expresses weight as a per cent of nitrogen, phosphorus and potassium
Fertilizer Analysis
—For Example
—A 100 kg bag of fertilizer has an analysis of 15-5-15. How many pounds of nitrogen, phosphorus and potassium are in the bag?
—Nitrogen: 100 X 15%=15 Kg
—Phosphorus: 100 X 5%=15 Kg
—Potassium: 100 X 15%=15 Kg
Fertilizer Ratios
—A fertilizer with a 10-10-10 analysis would have a 1:1:1 ratio
—A fertilizer with a 24-8-16 analysis would have a 3:1:2 ratio
—What would be the ratio for a fertilizer with an analysis of 36-18-27?4:2:3
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