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Soil Macronutrients

C arbon -Hydrogen-Oxygen-Nitrogen-Phosphorus-Potassium . Soil Macronutrients . Nutrients . Macronutrients Needed in larger quantities Micronutrients Needed in smaller quantities . Non-Fertilizer Nutrients . Cannot be supplied in a fertilizer Come from Water & Air (H2O & CO2) Carbon

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Soil Macronutrients

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  1. C arbon-Hydrogen-Oxygen-Nitrogen-Phosphorus-Potassium Soil Macronutrients

  2. Nutrients • Macronutrients • Needed in larger quantities • Micronutrients • Needed in smaller quantities

  3. Non-Fertilizer Nutrients • Cannot be supplied in a fertilizer • Come from Water & Air (H2O & CO2) • Carbon • Hydrogen • Oxygen

  4. Primary Macronutrients • Nitrogen • Phosphorus • Potassium • Complete fertilizer must contain all 3

  5. Secondary Macronutrients • Calcium • Magnesium • Sulfur

  6. Nitrogen • Encourages Growth • Gives plants a dark green color Deficiency: - Plant turns lighter green - Yellowing leaves - Slow growth

  7. Phosphorus • Root Development • Encourages Flowering • Improves Winter Hardiness • Deficiency • Purplish coloration to leaves • Stunted Growth

  8. Potassium • Increases disease resistance • Thickens cell walls • Aids in the transport of food in the phloem • Deficiency • Yellowing, death of tissue at the tips.

  9. For Proper Fertilizer Application Fertilizer Problems

  10. Calculating Pounds of Fertilizer • A bag of fertilizer has 3 numbers on it. • N-P-K • 10-15-20 • Weight of Bag X % of Nutrients = Lbs. of Nutrient in the bag.

  11. Practice Problem • 10% Nitrogen- 15% Phosphorus-10% Potassium • The bag weighs 50lbs. • How many pounds of Nitrogen are in this bag of fertilizer? 50 x .10= 5lbs. Nitrogen

  12. Try it on you own: Problem #1 • You purchased a bag 33 pound bag of 25-5-15 vegetable fertilizer for your garden this summer. If you wanted to re-create this fertilizer for next year, how many pounds of nitrogen, phosphorous and potassium would you need?

  13. Answers • Nitrogen: 0.25*33lbs.= 8.25 lbs. • Phosphorous: 0.05*33lbs.= 1.65 lbs. • Potassium: 0.15*33lbs.= 4.95 lbs.

  14. Try it on your own: Problem #2 • You are mixing a fertilizer for your flower garden. You ended up with 50 pounds of fertilizer. The fertilizer contains 5 pounds of nitrogen, 5 pounds of phosphorous and 15 pounds of potassium. You want to patent your product, but you need to include the ‘three numbers’. • What percentage of the fertilizer is nitrogen? Phosphorous? Potassium?

  15. Answer • Nitrogen: 5 lbs./50 lbs.= 0.10 = 10% • Phosphorous: 5 lbs./50 lbs. = 0.10 =10% • Potassium: 15 lbs./50 lbs. = 0.30 = 30%

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