irrigation in saskatchewan project presentation from 2001 used as notes 2002
TRANSCRIPT
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Irrigation in SaskatchewanIrrigation in Saskatchewan
Project Presentation from 2001
Used as notes 2002
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Irrigation DesignIrrigation Design
Three basic designs– Sprinkler applied– Surface applied– Trickle applied
Choice of design dependent on irrigator’s situation.
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Sprinkler Applied IrrigationSprinkler Applied Irrigation
Water is sprayed through the air in a mist and falls to the ground like rainfall.
Three configurations:– Multi-sprinkler– Single-sprinkler– Boom-sprinkler
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Multi-sprinkler SystemsMulti-sprinkler Systems
one pumping unit supplies one mainline pipe unit and supplies various lateral pipe units which have sprinkler heads.
Various Techniques:– Permanent– Hand moved and Tractor Moved– Self propelled as: center pivot and lateral
moved
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Single-sprinkler SystemsSingle-sprinkler Systems
gun- type sprinkler that operates under high enough pressure to irrigate 1-6 acres in circumference.
Application Techniques:– Hand moved– Tractor moved– Self Propelled
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Boom Sprinkler SystemsBoom Sprinkler Systems
long lateral pipe with two nozzles evenly spaced to provide better water distribution single-sprinkler.
backpressure spins the lateral pipe.will irrigate an area of 1.0 to 2.5 acres
per setting. same techniques of application as the
single-sprinkler.
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Surface Applied IrrigationSurface Applied Irrigation
Intensively level or alter land.Water is applied on the ground at
ground level and flows by gravity over the surface of the field.
Level surface applied irrigation has standing water (< 0.1% grade).
Graded surface applied irrigation has flowing water (0.1%-1.0% grade).
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Surface Irrigation TechniquesSurface Irrigation Techniques
Three basic techniques of application for both level and graded:– Furrow– Level Border – Contour Levee
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Trickle applied IrrigationTrickle applied Irrigation
A system of pumping filtered water directly onto or below the soil surface.
Water is carried through an extensive pipe network to each plant.
Water is expelled out emitters. Emitter differences are the applicationdifferences in technique.Emitters are prone to clogging.
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Leaching Caused by IrrigationLeaching Caused by Irrigation
Irrigation water is over applied– soil erosion– leaching of nutrients– leaching of pesticides
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Leaching Caused by IrrigationLeaching Caused by Irrigation
Leaching of Nutrients– nitrogen is very water soluble– over application of water can lead to N
deposited in lower soil levels– can also lead to contamination of
groundwater of N
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Leaching Caused by IrrigationLeaching Caused by Irrigation
Leaching of Pesticides– Pesticides Must be
• broken down by soil microorganisms
• taken up by plants
• adsorbed to the soil particles
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Leaching Caused by IrrigationLeaching Caused by Irrigation
Management– identify soil texture – irrigation schedule
• track of water losses from evapotranspiration• irrigate when 40 - 70 percent of available soil
water is depleted
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Soil Water QualitySoil Water Quality IntroductionIntroduction
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Water SourcesWater Sources
Surface WaterSurface WaterGroundwaterGroundwaterEffluentEffluent
– MunicipalMunicipal– AgriculturalAgricultural– IndustrialIndustrial
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Water Quality GuidelinesWater Quality Guidelines
Increasing SevereProblems Problems
SalinityEC (mS/cm) < 0.70 0.70 - 3.0 > 3.0*TDS (mg/L) < 490 490 - 2100 > 2100SAR (Permeability Effect on Soil)0-3 > 0.7 0.7 - 0.2 < 0.23-6 >1.2 1.2 - 0.3 < 0.36-12 >1.9 1.9 - 0.5 < 0.512-20 > 2.9 2.9 - 1.3 < 1.320-40 > 5.0 5.9 - 2.9 < 2.9Specific IonsSodium - most annual crops use salinity tables
- trees, woody ornamentals < 3 3.0 - 9.0 > 9Chlorides (mg/L) - most annual crops use salinity tables
- trees, woody < 140 140 - 350 > 350Boron (mg/L) - general guideline < 0.70 0.70 - 2.0 > 2
Degree of Irrigation Problem
No Problem
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Salinity and SARSalinity and SAR
0
1
2
3
4
0 10 20 30 40
Sodium Adsorption Ratio
Sal
inity
(dS
/m)
+ Drainage Water
Favourable Conditions
Unfavourable Conditions
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Specific Ion TolerancesSpecific Ion Tolerances
BoronBoronChlorideChlorideSodiumSodium
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Other ConsiderationsOther Considerations
MetalsMetalsNutrientsNutrientsBiological OrganismsBiological Organisms
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RemarksBACTERIASalmonella most common; causes gastroenteritis;usually spread by eating contaminated meat;
no reported diseases from irrigation with secondary effluent, but reported outbreaks
with raw sewage.
Esherichia Coli normally present, causes diarrhea in children and gastroenteritis and urinary
infections in adults; not expected to be a problem in treated wastewater
Mycobacteria tuberculosis, skinulcers and leprosy; baclli must be ingested; resists disinfection
and persists for months; little evidence of infection from land application
VIRUSES generally host-specific and cannot replicate outside most cells; tend to concentrate
in sludge; little evidence to indicate a health hazard in effluent of other irrigation water
HELMINTHSNematodes parasitic intestinal worms; eggs are biologically resistant; reported to survive for up
to 7 years in soil; important in sludge (not effluent)
Cestodes usually associated with ingestion of improperly cooked affected meat; usually
Taenia saginata (beef) associated with sludge and would require direct ingestion; not considered an
T. solium (pork) irrigation problem
PROTOZOA enteropathogen protozoa cysts are resistant to disinfectant and environment stress; associated with sludge; direct ingestion required
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Irrigation and Soil QualityIrrigation and Soil Quality
VastIntegratedcomplex
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Major factors controlling irrigation’s affect on soil qualityStructure and textureBiotic factorIrrigation constitution
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Structure and Texture
Foundation of irrigation’s affect on soilRunoff/ erosion/ nutrient loss/ Soil
removalInfiltration/ Structure
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Biotic FactorBiotic Factor
Most important and most affected by water
Microbes are the soil MafiaSaline irrigate waterwater loggingcompaction
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NutrientsNutrients
LeachingTransformation
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Disease Disease
Suppressed incidenceEncouraged incidenceNo affect
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Impurities in irrigate water
Many sortsSaltsEffluent