Soil Nutrients

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Soil Nutrients

• Chapter 8

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What nutrients do plants get from the air and
water?

• Carbon
• Hydrogen
• Oxygen

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What are the Primary Nutrients?

• Nitrogen
• Phosphorous
• Potassium

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What are the Secondary Nutrients?

• Sulfer
• Calcium
• Magnesium

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What are the Micronutrients?

• Iron
• Boron
• Zinc
• Manganese
• Copper
• Molybdenum
• Chlorine

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What are the 16 essential nutrients?

• C HOPKNS CaFe Mg B Mn CuZn ClMo

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Functions of Primary Nutrients and the
deficiency symptoms?

• Nitrogen other than water, most important,
  determines rate of growth
• deficiency yellowing of leaves
• Phosphorous needed most during germination and
  during fruit/seed formation
• deficiency stunted growth, purple color in
  leaves
• Potassium mostly regulatory
• deficiency stunted growth, mottled leaves

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Are there non-essential plant nutrients that need
to be considered?

• Yes, iodine and cobalt are essential in animals
  but found in plants

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Why is a knowledge of soil nutrients necessary?

• maximize yield
• maximize profit
• maintain soil fertility

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How do you determine soil fertility?

• soil testing
• manage organic matter
• fertilize

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What is Fertilizer Analysis?

• it is the amount of the different nutrients found
  in a fertilizer
• the amount is listed as a percent
• it is ALWAYS listed Nitrogen-Phosphorous-Potassium
  (N-P-K)
• a fertilizer labeled 10-15-10 is 10 Nitrogen,
  15 Phosphorous, and 10 Potassium
• if there is a fourth letter it is for Sulfer

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How many pounds of Nitrogen are in a 50 bag of
10-15-10?

• 10 of 50 5 Nitrogen

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Pounds of Actual Nutrients in a 50 bag of
10-15-10?

• add up 101510 35 nutrients or 17.5

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What is the other 65 of this bag?

• inert matterials (filler)

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Analysis

• A hobby gardener buys a bag of "Scott's
  Turfbuilder" uptown for 31.95. The bag weighs
  62 and has an analysis of 22-3-3-10.
• How many pounds of actual nutrients?
• 17.2
• What is the cost per pound of actual nutrients?
• 1.86

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Analysis

• A similar analysis of "Farmers Grade Fertilizer"
  runs about 0.40 per pound of actual nutrient.

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