drip/micro irrigation micro irrigation ylow volume / low ...€¦ · micro irrigation systems yi t...

of 3/3
Irrigation Basics for Landscape Irrigation Contractors – LSU AgCenter 1 Micro Irrigation Micro Irrigation Dr. Ron Sheffield LSU Ag Center, Biological & Agricultural Engineering [email protected] Drip/Micro Irrigation Drip/Micro Irrigation y Low volume / low flow y Facilitates daily or more frequent irrigation to reduce plant moisture stress y Low pressure requirements (10-15 pounds per square inch (psi) pressure and low flow rates (gallons per hour (gph) instead of gallons per minute (gpm)) Micro Micro-Irrigation Irrigation Advantages y Water conservation y Control of soil moisture y Use of small or low flow water sources Disadvantages y High maintenance requirement y Limited coverage / applications Li it d l f y Reduced weeds y No conflict with land use y Better performance on slopes y No spray on buildings y Limited supply of moisture in all the root zone y Filtration and pressure control is critical y Exposure of equipment to elements and vandalism y Non visible watering Filers Filers y Most important part of a micro-irrigation system y Strainers y Filters Mesh size Manual or self-cleaning Pressure Regulators Pressure Regulators y Typically needed for most installations, due to low pressure requirements of micro irrigation systems I t ll d t f y Install downstream of filter y Once operational, adjust pressure if using a manual regulator Micro Micro-Emitters Emitters y Drip Emitter y Micro Spray Emitter

Post on 20-Jul-2020

6 views

Category:

Documents

0 download

Embed Size (px)

TRANSCRIPT

  • Irrigation Basics for Landscape Irrigation Contractors – LSU AgCenter

    1

    Micro IrrigationMicro Irrigation

    Dr. Ron SheffieldLSU Ag Center, Biological & Agricultural [email protected]

    Drip/Micro IrrigationDrip/Micro IrrigationLow volume / low flowFacilitates daily or more frequent irrigation to reduce plant moisture stressLow pressure requirements (10-15 pounds per square inch ( p p q(psi) pressure and low flow rates (gallons per hour (gph) instead of gallons per minute (gpm))

    MicroMicro--IrrigationIrrigation

    AdvantagesWater conservationControl of soil moistureUse of small or low flow water sources

    DisadvantagesHigh maintenance requirementLimited coverage / applicationsLi it d l f Reduced weeds

    No conflict with land useBetter performance on slopesNo spray on buildings

    Limited supply of moisture in all the root zoneFiltration and pressure control is criticalExposure of equipment to elements and vandalismNon visible watering

    FilersFilersMost important part of a micro-irrigation system

    StrainersFilters

    ◦ Mesh size◦ Manual or self-cleaning

    Pressure RegulatorsPressure RegulatorsTypically needed for most installations, due to low pressure requirements of micro irrigation systemsI t ll d t f Install downstream of filterOnce operational, adjust pressure if using a manual regulator

    MicroMicro--EmittersEmitters

    Drip EmitterMicro Spray Emitter

  • Irrigation Basics for Landscape Irrigation Contractors – LSU AgCenter

    2

    Micro Irrigation OptionsMicro Irrigation Options

    “Soaker-hoses”

    Micro-drips

    InstallationInstallation

    Wetted Pattern ShapesWetted Pattern Shapes

    6-9 ft4-6 ft

    2-3 ft

    Clay Loam Sand

    Calculating MicroCalculating Micro--Irrigation RatesIrrigation Rates

    Required Information1. ET (inches/day)2. Irrigation Efficiency (0.80 – 0.90)

    G ll F (GF)3. Gallonage Factor (GF)4. Plant Factor (PF)

    Example: Smoke Bush in N.O.Example: Smoke Bush in N.O.

    geFa

    ctor

    s

    Page 260

    Gal

    lona

    g

  • Irrigation Basics for Landscape Irrigation Contractors – LSU AgCenter

    3

    GallonageGallonage Factors (GF)Factors (GF)

    Smoke Bush in New OrleansETo = 0.24 in/day; 85% Efficiency; 5-6ft diameter shrub

    GF = 5.2

    MicroMicro--Irrigation Plant FactorsIrrigation Plant FactorsPlant Factor (PF) Plant Types

    1.00 Small shrubs (under 4 ft. diameter)GroundcoverEvergreensVines

    0.80 Mature trees

    0.70 Shrubs (over 4 ft. diameter)Native plants (newly planted)Shrubs (native to humid areas)

    0.40 Established plants (native to area)

    Smoke Bush: Native Cultivar; 5-6 ft diameter

    Example: Smoke Bush in N.O.Example: Smoke Bush in N.O.Average ETo = 0.24 in/dayPF = 0.70Gallonage Factor (GF)◦ 6 ft diam◦ ET = 0.25◦ 85% efficiency◦ GF = 5.2

    GPD = GF * PF◦ GPD = 5.2 * 0.7◦ GPD = 3.6 gpd

    Smoke Bush (5-6 ft diameter)

    Micro IrrigationMicro Irrigation

    Dr. Ron SheffieldLSU Ag Center, Biological & Agricultural [email protected]