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2 Wwg2 Soil Hydrozone Irrigation
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2 Wwg2 Soil Hydrozone Irrigation Presentation Transcript

  • 1.  
  • 2. Irrigation Management and Water-Wise Gardening HCC100 -- Horticultural Science, The Science of Gardening
  • 3. 7 Principles of Water-Wise Gardening
  • 4. Planning and designing for water conservation, beauty, and utility
  • 5. Improving the soil
    • Add organic matter
  • 6.
    • Creating practical turf and non-turf areas
  • 7. Watering efficiently with appropriate irrigation methods
    • Irrigation efficiency has greatest water savings potential for most home gardeners.
  • 8.
    • Selecting plant appropriate for our climate
    • AND
    • Grouping them according to their water needs ( Hydrozoning )
    • AND
    • Irrigating according to water need
  • 9. Mulching to reduce evaporation
  • 10. Maintaining with good horticultural practices
    • Healthy plants are more tolerant of insect and disease problems.
    • Healthy plants have fewer insect and disease problems
    • Iron chlorosis, a symptoms of springtime over-watering
  • 11. 7 Principles of Water-Wise Gardening
    • Planning and design for water conservation, beauty, and utility
    • Improving the soil
    • Creating practical turf and non-turf areas
    • Watering efficiently with appropriate irrigation methods
    • Selecting plants and grouping them according to water need
    • Mulching to reduce evaporation
    • Maintaining with good horticultural practices
  • 12. Planning and designing for water conservation, beauty, and utility
  • 13. Create a base plan
    • Make a simple drawing of the property
      • Typical scale is 8-10 feet per inch
    • Show site amenities
      • Buildings
      • Hardscape features (driveways, walks, patio, deck)
      • Existing plant materials
      • Utility lines
    • Site limitations
      • Sun exposure
      • Wind patterns
      • Drainage issues
  • 14.  
  • 15.  
  • 16. Landscaping on Expansive Soils
    • CSU Cooperative Extension Fact Sheet #7.236
  • 17. Make a bubble diagram
    • Use areas (identifying irrigation needs )
      • Lawns
        • Routine, reduce, low and non-irrigated turf areas
      • Shrub, flowerbeds and ground covers with
        • Routine, reduce, low and non-irrigated areas
      • Fruit & vegetable gardens
      • Children’s play areas
      • Pet areas
      • Natural areas
      • Non-plant areas
  • 18.  
  • 19. Refine the landscape plan
    • Convert bubble areas to a landscape plan.
  • 20. Planning and designing for water conservation, beauty, and utility
    • Take home message:
  • 21. Planning and designing for water conservation, beauty, and utility
    • Take home message
      • It takes planning… water conservation, beauty, and utility does not happen by accident.
  • 22.
    • Selecting plant appropriate for our climate
    • AND
    • Grouping them according to their water needs ( Hydrozoning )
    • AND
    • Irrigating according to water need
  • 23. Colorado is a semi-arid climate.
    • Select plants suitable to a semi-arid climate.
    • Plant pallet is limited, but not void, without supplemental irrigation.
  • 24. Colorado is a semi-arid climate.
    • Suggested references
    • Xeriscape Plant Guide , by Denver Water, Fulcrum Publishing
    • Xeric Tree and Shrub List by the Community Tree Alliance , CMG Fact Sheet #T15
  • 25. Colorado is a semi-arid climate.
    • On sites, where landscape irrigation is not desirable or possible, focus on natural growth.
  • 26. Hydrozoning Grouping plants according to irrigation needs, AND watering according to need . Routinely irrigated flowerbed Non-irrigated naturalized area
  • 27. Design with irrigation demand in mind. Routine Irrigation Reduced Irrigation Need Limited irrigation once established non-irrigated
  • 28. Design with irrigation demand in mind. Routine Irrigation Reduced Irrigation Need Limited irrigation once established
  • 29. Design with irrigation demand in mind. Garden Routine Irrigation Reduced Irrigation Need Limited irrigation once established
  • 30. Design with irrigation demand in mind. Routine Irrigation Reduced Irrigation Need Limited irrigation once established non-irrigated
  • 31. Hydrozoning myths
    • Xeriscaping is NOT a cacti and rock garden .
  • 32. The objective of hydrozoning is to place low-water requiring plants together in zones that actually receive reduced to no irrigation!
  • 33. Even xeric plant need rain/irrigation during establishment.
  • 34. Water-wise concepts support irrigation for “people space” “ People space” at Thanksgiving Point Gardens
  • 35.
    • Selecting plant appropriate for our climate
    • AND
    • Grouping them according to their water needs ( Hydrozoning )
    • AND
    • Irrigating according to water need
  • 36. Improving the soil
    • Add organic matter
  • 37. Improving the soil
    • Sandy Soils
  • 38. Improving the soil
    • Sandy Soils
    • Add organic matter
  • 39. Improving the soil
    • Sandy Soils
    • Add organic matter
      • Hold 10+ times more water and nutrients than sand
  • 40. Improving the soil
    • Loam & Clayey Soils
  • 41. Improving the soil
    • Loam & Clayey Soils
      • Add organic matter
      • Prevent compaction
  • 42. Improving the soil
    • Loam & Clayey Soils
      • Add organic matter
      • Prevent compaction
     large pore spaces  deep rooting  water supply
  • 43. Improving the soil
    • Exception
    • Some native plants to the high plains and Rocky Mountain region prefer poor soils .
    • In improved soils
      • May thrive, loosing their xeric characteristics
      • Do poorly
  • 44. Factors influencing irrigation management
    • Soil’s water holding capacity
    • Evapotranspiration, ET
    • Rooting depth
    • Plant’s ability to extract water from the soil
  • 45. Water holding capacity
    • Pore spaces
      • Texture and structure
    • Large pore spaces
      • Air
      • Water moves down with gravitational pull
    • Small pore spaces
      • Water
      • Water moves in all directions by capillary action
  • 46. Water holding capacity Saturation Field Capacity Wilting Point
  • 47. Water holding capacity
  • 48. Water holding capacity
  • 49. Evapotranspiration, ET
    • Evapotranspiration, ET , is the rate a crop uses water for transpiration plus evaporation from the soil surface.
    • Factors influencing ET
      • Weather
        • Solar radiation
        • Temperature
        • Wind
        • Humidity
      • Stage of plant growth
  • 50. Evapotranspiration, ET
    • Typical ET for Cool Season Turf*
    • April May June July Aug. Sept. Oct.
    • Per
    • Month 3.98” 4.9” 6.0” 6.5” 5.5” 4.0” 2.8”
    • Per
    • Day 0.13” 0.16” 0.20” 0.21” 0.18” 0.13” 0.09”
    • *Northern Colorado Front Range area
  • 51. Rooting depth and irrigation
    • A deeper rooting system
    • Larger supply of water
    • Go longer between irrigations
    • In compacted or clayey soil
    • Low levels of soil oxygen
    • Limit rooting depth
    • Reducing supply of available water
  • 52.
    • Soil’s water holding capacity
    • + ET
    • + Rooting depth
    • Irrigation management
  • 53.
    • Sandy Loam
    • Sand Loam w/ clay
    • 12” rooting depth
    • Inches available water
    • Amount of water per irrigation
    • 0.5” 0.75” 1”
    Irrigation summary
  • 54.
    • Sandy Loam
    • Sand Loam w/ clay
    • 12” rooting depth
    • Inches available water
    • Amount of water per irrigation
    • 0.5” 0.75” 1”
    • Days between irrigations
    • April (at 0.13”/day) 4 6 8
    • July (at 0.20”/day) 2.5 4 5
    Irrigation summary
  • 55.
    • Sandy Loam
    • Sand Loam w/ clay
    • 6” rooting depth
    • Inches available water
    • Amount of water per irrigation
    • 0.25” 0.38” 0.5”
    Irrigation summary
  • 56.
    • Sandy Loam
    • Sand Loam w/ clay
    • 6” rooting depth
    • Inches available water
    • Amount of water per irrigation
    • 0.25” 0.38” 0.5”
    • Days between irrigations
    • April (at 0.13”/day) 2 3 4
    • July (at 0.20”/day) 1 2 2.5
    Irrigation summary
  • 57.
    • Sandy Loam
    • Sand Loam w/ clay
    • 24 inch rooting depth
    • Inches available water
    • Amount of water per irrigation
    • 1” 1.5” 2”
    • Days between irrigations
    • April (at 0.13”/day) 8 11.5 15
    • July (at 0.20”/day) 5 7.5 10
    Irrigation summary
  • 58.
    • Sandy Loam
    • Sand Loam w/ clay
    • 6 inch rooting depth
    • Amount 0.25” 0.38” 0.5”
    • Days 1 2 2.5
    • 12 inch rooting depth
    • Amount 0.5” 0.75” 1”
    • Days 2.5 4 5
    • 24 inch rooting depth
    • Amount 1” 1.5” 2”
    • Days 5 7.5 10
    Irrigation summary -- July
  • 59. Factors influencing irrigation demand
    • Soil organic content
      • Organic matter holds 10X more water than sand.
  • 60.
    • Sandy Loam
    • Sand Loam w/ clay
    • 6 inch rooting depth
    • Amount 0.25” 0.38” 0.5”
    • Days 1 2 2.5
    • 12 inch rooting depth
    • Amount 0.5” 0.75” 1”
    • Days 2.5 4 5
    • 24 inch rooting depth
    • Amount 1” 1.5” 2”
    • Days 5 7.5 10
    Irrigation summary -- July
  • 61. Factors influencing irrigation demand
    • Irrigation pattern
      • Frequent watering = shallow rooting depth
  • 62. Factors influencing irrigation demand
    • Stage of growth
      • Water use high during blossoming and fruiting
  • 63. Factors influencing irrigation demand
    • Water demand of plants
      • To support growth
      • To survive dry spells
  • 64. Fine-tune the irrigation management
  • 65. Fine-tune the irrigation management
    • In the normal June/July days
    • IF a lawn goes 5 days on 1”
  • 66. Fine-tune the irrigation management
    • In the normal June/July days
    • IF a lawn goes 5 days on 1”
      • Apply
        • 1.0” every 5 days
          • Additional amounts would leach below root zone.
        • 0.8” every 4 days
        • 0.6” every 3 days
        • 0.4” every 2 days
        • 0.2” every day
  • 67. Fine-tune the irrigation management
    • In the normal June/July days
    • IF a lawn goes 4 days on 0.8 ”
  • 68. Fine-tune the irrigation management
    • In the normal June/July days
    • IF a lawn goes 4 days on 0.8 ”
      • Apply
        • 0.8” every 4 days
          • Additional amounts would leach below root zone.
        • 0.6” every 3 days
        • 0.4” every 2 days
        • 0.2” every day
  • 69. Fine-tune the irrigation management
    • In the normal June/July days
    • IF a lawn only goes 2 days on 0.4”
  • 70. Fine-tune the irrigation management
    • In the normal June/July days
    • IF a lawn only goes 2 days on 0.4”
      • Apply
        • 0.4” every 2 days
          • Additional amounts would leach below root zone.
        • 0.2” every day
  • 71. Normal irrigation requirement
    • Cool season turf*
    • April May June July Aug. Sept. Oct.
    • Per
    • week 0.9” 1.1” 1.4” 1.5” 1.2” 0.9” 0.6 ”
    • 7/8” 1 1/8” 1 3/8” 1 1/2” 1 1/4” 7/8” 5/8”
    • * Northern Colorado Front Range area, based on historical ET, normal rainfall and a 70% sprinkler efficiency rating.
  • 72.
    • What do you advise the gardener about, “How much and how often to water the lawn?”
  • 73. Improving the soil
    • Take home message:
    • On sandy soils, O.M improves water holding capacity
    • On clayey soils, O.M. improves soil tilth
      • Deeper rooting depth
        • Greater water supply