soil macronutrients
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SOIL MACRONUTRIENTS C arbon-Hydrogen-Oxygen-Nitrogen-Phosphorus-Potassium
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 Hydrogen Oxygen
Primary Macronutrients
Nitrogen Phosphorus Potassium
Complete fertilizer must contain all 3
Secondary Macronutrients
Calcium Magnesium Sulfur
Nitrogen
Encourages Growth Gives plants a dark
green colorDeficiency: - Plant turns lighter green - Yellowing leaves- Slow growth
Phosphorus
Root Development
Encourages Flowering
Improves Winter Hardiness Deficiency
Purplish coloration to leaves
Stunted Growth
Potassium
Increases disease resistance
Thickens cell walls
Aids in the transport of food in the phloem Deficiency
Yellowing, death of tissue at the tips.
FERTILIZER PROBLEMS For Proper Fertilizer Application
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.
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
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?
Answers
Nitrogen: 0.25*33lbs.= 8.25 lbs.
Phosphorous: 0.05*33lbs.= 1.65 lbs.
Potassium: 0.15*33lbs.= 4.95 lbs.
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?
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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