7 Chapter 7 Fertilizer White

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  • 1. FERTILIZERS AND GRASS CYCLING
    • Three Main Points:
    • Know why, how much, and what kind of fertilizer to apply.
    • 2. Fast release, high nitrogen fertilizers have the potential to cause plant problems and water pollution.
    • 3. Grass cycling is an effective lawn fertilizer, and saves money and time.
  • 2. Why Do We Fertilize?
    • Q. Why do we fertilize?
      • Replace nutrients that we’ve removed through harvest, pruning, mowing, etc.
      • Aid plants not naturally adapted to some soils
      • Push plants to meet the function that we desire
    • Q. What is the function of landscaping?
      • Beauty, visual satisfaction – green leaves, colorful flowers
      • Planting for function – turf to play on, visual screen with hedge
    • Consider PLANT FUNCTION before we consider FERTILIZER .
  • 3. Best for the Environment
    • Clean Water
    • No Greenwaste
    • No Pesticides
  • 4. Fertilizers
    • Organic:
    • Synthetic:
    • Reading A Bag of Fertilizer:
      • What do the three numbers on a fertilizer bag stand for?
  • 5. Example of Synthetic Fertilizer
  • 6. Example of Organic Fertilizer
  • 7. N – P - K
  • 8. N-P-K
    • Nitrogen – Phosphorus - Potassium
    • Nitrogen (N)
    • Stimulates photosynthesis, used for vegetative growth
    • Sources
    • Grass clippings and green leaves
    • Organic sources
      • fish emulsion
      • blood, fish, cottonseed, soybean or alfalfa meals,
      • high nitrogen bird or bat guanos
    • Synthetic fertilizers
  • 9. N-P-K
    • Nitrogen – Phosphorus - Potassium
    • Phosphorus (P)
    • Stimulates flower, fruit and root production. Rose fertilizers have higher levels of phosphorus.
    • Sources
    • Synthetic fertilizers
    • Organic sources
      • Rock phosphates, bone meal, high P bird and bat guanos.
  • 10. N-P-K
    • Nitrogen – Phosphorus - Potassium
    • Potassium (K)
    • Stimulates plant vigor, and disease and pest resistance
    • Sources
    • Synthetic fertilizers
    • Organic sources
      • horse manures
      • kelp
      • mineral
      • some soils
  • 11. Nutrient Solubility
  • 12.
    • How do plants get nutrients in nature?
    • Slow Release (insoluble) fertilizers closer to natural system
    • Fast Acting (soluble) fertilizers for emergency use
    • Describe a situation where a plant might need a fast acting fertilizer?
    Soluble (fast acting) and insoluble (slow release) nutrients.
  • 13.
    • 1. Wasted resources
      • Once soluble fertilizers get wet, available all at once.
    • 2. Fast acting fertilizers flood roots with only a few nutrients.
    • 3. High solubility fertilizers = pollution potential
      • Only 30 - 50% fertilizers may reach plant
    • 4. Fast acting fertilizers cause pest problems
    Management Problems with High Solubility Nitrogen Fertilizers
  • 14. Nutrient Source Advantage Disadvantage Greenwaste - Wide range of nutrients - Generated on-site: saves transport fees - No purchase costs - Compatible with existing soil micro-organism population - Low N-P-K value - May require shredding or composting, depending upon use - Slow release of nutrients Organic fertilizer - Wide range of nutrients - Benefits soil micro-organism populations - Low labor costs with infrequent app needs - High material costs Synthetic fertilizer – Slow release - Low labor costs with infrequent application needs - Narrow range of nutrients - High material costs - Potentially destructive to soil micro-organism populations Synthetic fertilizer –Fast release - Inexpensive material costs - Immediate plant response - Narrow range of nutrients - High labor costs w/ frequent apps. - Potentially destructive to soil micro-organism populations - Benefit only lasts a month - Potential to make plants more susceptible to pest problems
  • 15. Ways To Prevent Problems From Fertilizers
    • Avoid fast acting, high nitrogen fertilizers
    • Add organic matter to soil (compost, mulch).
    • Add organic supplements for plant strength and pest resistance
      • Kelp
      • Worm castings (worm manure)
      • Compost Tea (a liquid fertilizer made by soaking compost and other materials)
    • Adequate irrigation
    • Fertilize only as much as and when necessary
  • 16. Grass Cycling
    • What does grass cycling mean ?
    • Leave Clippings:
      • More fertile soil
      • More stable soil life
      • Less compaction
      • Healthier roots
      • Better pest resistant
    • Haul clippings:
      • Must add fertilizer
      • Starve micro-organisms
      • Worse compaction
      • Stressed roots
      • More pest prone
  • 17. Grass Cycling Facts
    • Nitrogen from clipping can be recycled in 2 to 3 days (radio isotope studies)
    • Average lawn = 300-400 lbs of clipping per 1,000 square feet per year
    • 30 lbs of fertilizer with 8-4-6 analysis
    • Advantages of Grass Cycling
    • NO cost to buy: Save 35-75% of fertilizer costs
    • SAVE time: 50% less time
    • BETTER soil: Adds organic matter addition to soil
    • SAVE your back: 300 – 400 lbs clippings per lawn
  • 18. Fertilizer Field Exercise
    • Distance of walking stride
    • Square footage of two ‘lawns’
    • Amount of fertilizer for each lawn
  • 19. Selecting and Applying Fertilizers for Water Quality Protection
  • 20. Review
    • Three Main Points:
    • 1. Fertilize to meet plant FUNCTION
    • 2. Benefits of insoluble and organic fertilizers
    • 3. Grass cycling saves money, time and fertilizes the lawn
    • What do we mean by PLANT FUNCTION?
    • What does nitrogen do?
    • What does phosphorus do?
    • What does potassium do?
    • Describe the links between fertilizers and pests:
    • Ways to prevent problems from fertilizers:
    • What does GRASS CYCLING mean? Why does it help you?
  • 21. Homework:
    • Check fertilizer bags you use.
    • Look for total analysis, total N, soluble N.
    • Use the chart to determine how much of this fertilizer to use and how often.
    • Write down this information and bring to next class.