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Soil Nutrients

Soil Nutrients. Modified by the GA Agricultural Education Curriculum Office July 2002. Nutrients Plants Acquire From Air And Water. Carbon Hydrogen Oxygen. The Primary Nutrients. Potassium. Nitrogen. Phosphorus. The Secondary Nutrients. Magnesium. Sulfur. Calcium.

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Soil Nutrients

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  1. Soil Nutrients Modified by the GA Agricultural Education Curriculum Office July 2002

  2. Nutrients Plants Acquire From Air And Water • Carbon • Hydrogen • Oxygen

  3. The Primary Nutrients • Potassium • Nitrogen • Phosphorus

  4. The Secondary Nutrients • Magnesium • Sulfur • Calcium

  5. The Micronutrients • Boron • Chlorine • Copper • Iron • Manganese • Molybdenum • Zinc

  6. The 16 Essential Nutrients Manganese Molybdenum Nitrogen Oxygen Phosphorus Potassium Sulfur Zinc • Boron • Calcium • Carbon • Chlorine • Copper • Hydrogen • Iron • Magnesium

  7. Functions Of Primary Nutrients And Deficiency Symptoms • Nitrogen (N): most important nutrient besides water; determines rate of growth • deficiency symptom: yellowing of leaves • Phosphorous (P): required during germination and fruit/seed formation • Deficiency symptoms: stunted growth; purple-colored leaves • Potassium (K): regulatory • Deficiency symptoms: stunted growth; mottled leaves

  8. Non-essential Nutrients That Need To Be Considered • Iodine • Cobalt • Silicon

  9. Why Is A Knowledge Of Soil Nutrients Necessary? • To maximize yield • To maximize profit • To maintain soil fertility

  10. Determining Soil Fertility You can use any of the following methods to determine soil fertility: • soil tests • managing organic matter • fertilizing

  11. What Is Fertilizer Analysis? • The amount of the different nutrients found in a fertilizer. • It is always listed as a percent. • It is always listed Nitrogen-Phosphorous-Potassium (N-P-K). • For example, a fertilizer labeled 10-15-10 is 10% Nitrogen, 15% Phosphorous, and 10% Potassium. • If there is a fourth letter, it designates the nutrient sulfur.

  12. Example Problem For Determining The Amount Of A Nutrient In A Fertilizer • How many pounds of nitrogen are in a 50 pound bag of 10-15-10? • 10% of 50# = 5# Nitrogen

  13. Example Problem For Determining The Amount Of Total Nutrients In A Fertilizer • How many pounds of actual nutrients are in a 50 pound bag of 10-15-10? • 10+15+10 = 35% nutrients or 17.5# • The other 65% of the bag is inert matter

  14. Another Analysis Problem A hobby gardener buys a bag of "Scott's Turfbuilder" for $31.95. The bag weighs 62 pounds and has an analysis of 22-3-10. • How many pounds of actual nutrients does the bag contain? • 21.7# of nutrients in one bag • (22+3+10)=35% • 35%*62=21.7

  15. Another Analysis Problem (cont.) • What is the cost per pound of actual nutrients? • $1.47 • $31.95/21.7# nutrients=1.47

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