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Water & Transpiration or Water, water everywhere and all the boards did shrink. Water, water everywhere and not a drop to drink. Potential Evapotranspiration/ Las Cruces. PET = evaporation + transpiration from a crop under non-stressed conditions Adjusted to a ‘reference crop’ (grass)

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Water & TranspirationorWater, water everywhere and all the boards did shrink. Water, water everywhere and not a drop to drink.


Potential evapotranspiration las cruces
Potential Evapotranspiration/ Las Cruces

PET = evaporation + transpiration from a crop under non-stressed conditions

  • Adjusted to a ‘reference crop’ (grass)

  • Crop coefficient (kC) = ETC / ETO

  • Function of T, RH, season, leaf area, shading, crop species, soil moisture



Trees and water turfgrass actual water use farmington nm d smeal

Warm Season

Cool Season

Trees and Water…Turfgrass Actual Water Use / Farmington NM/ D. Smeal


Trees and water turfgrass actual water use farmington nm d smeal1

ET (in/d)

.25

Cool Season

.15

Warm Season

.05

Late, Warm Season

Apr

Jul

Oct

200

300

100

Julian Days

Trees and Water…Turfgrass Actual Water Use/ Farmington NM /D. Smeal


Trees and water how often should new trees be watered

Days without water (no.)

Time since transplanting (d)

Trees and Water…How often should new trees be watered?


Irrigation scheduling nonstressed
Irrigation Scheduling-nonstressed

Fancy formula:

  • PAW = AWC x MAD x RZ

  • Sooo,

    Plant Available Water =

    soil Available Water Content x Maximum Allowable Depletion x Root Zone depth


Pecan water use sammis et al

Irrigation

.75

A

B

C

.50

in/d

.25

Budbreak

Pecan Water Use/ Sammis et al.


Water transpiration irrigation water management
Water & TranspirationIrrigation & Water Management

  • Evapotranspiration: water loss through evaporation and transpiration

    • Yearly ET: ~ 200 cm

    • Yearly Ppt: ~ 20 cm

    • Deficit: ~ 180 cm

  • Daily ET (cm/d)

    Mar Apr May Jun Jul Aug Sep Oct 0.13 0.25 0.41 0.61 0.71 0.61 0.41 0.20


Water transpiration irrigation water management1
Water & TranspirationIrrigation & Water Management

  • Goals of Irrigation:

    • Meet the needs of the plant

    • Minimize runoff

      • erosion

      • chemicals

    • Minimize evaporation

    • Manage leaching

      • salts

      • NO3


Water transpiration irrigation water management2
Water & TranspirationIrrigation & Water Management

  • When to Irrigate?

    • Observe plants--too late!

    • Observe soil--’touchy-feeley’

    • Measure soil or plant water stress

      • tensiometer * neutron probe

      • pressure bomb * electrical resistance

      • leaf temperature

    • Estimate water use

      • evapotranspiration


Water transpiration irrigation water management3
Water & TranspirationIrrigation & Water Management

  • Reducing Water Use in the Landscape

    • Goal: Reduce evaporation

      • water at night or early morning

      • water deep to develop deep rooted plants

      • apply 5 cm organic mulch to cool soil

    • Goal: Put the water where you want it

      • directional sprinklers

      • berms or swales


Water transpiration irrigation water management4
Water & TranspirationIrrigation & Water Management

  • Reducing Water Use in the Landscape

    • Goal: Use low water plants

      • xeriscaping

      • plant breeding

      • not ‘zeroscaping’

    • Goal: Improve irrigation efficiency

      • drip irrigation

      • sub-irrigation


Things to know

Colligative properties

Hydrologic cycle

Irrigation

Solvent

Solute

Field Capacity

Permanent Wilting Point

Water Use Efficiency

Potential Evapotranspiration

Transpiration

Turgor

Wilting

MAD

RH

AWC

Water Potential

Xeriscaping

Things to Know


Water transpiration factors influencing transpiration musk mallow leaves
Water & TranspirationFactors Influencing Transpiration/ Musk mallow leaves

Base of Plant

Top of Plant


Water transpiration heat of fusion frost protection in vineyard
Water & TranspirationHeat of Fusion/Frost protection in vineyard

495 L/min/ha

103 L/min/ha


Water transpiration heat of vaporization peach bud bloom delay
Water & TranspirationHeat of Vaporization/ Peach bud bloom delay


Water transpiration factors influencing transpiration light t h 2 o
Water & TranspirationFactors Influencing Transpiration/ Light, T, H2O

Citrullus colocynthis

Excised leaf

Air T

Intact leaf


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