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7 Chapter 7   Fertilizer  White
 

7 Chapter 7 Fertilizer White

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    7 Chapter 7   Fertilizer  White 7 Chapter 7 Fertilizer White Presentation Transcript

    • 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.
    • 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 .
    • Best for the Environment
      • Clean Water
      • No Greenwaste
      • No Pesticides
    • Fertilizers
      • Organic:
      • Synthetic:
      • Reading A Bag of Fertilizer:
        • What do the three numbers on a fertilizer bag stand for?
    • Example of Synthetic Fertilizer
    • Example of Organic Fertilizer
    • N – P - K
    • 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
    • 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.
    • 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
    • Nutrient Solubility
      • 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.
      • 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
    • 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
    • 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
    • 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
    • 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
    • Fertilizer Field Exercise
      • Distance of walking stride
      • Square footage of two ‘lawns’
      • Amount of fertilizer for each lawn
    • Selecting and Applying Fertilizers for Water Quality Protection
    • 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?
    • 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.