Agricultural salinity problems facing California · Rice damage from salinity in Sacramento Valley...
Transcript of Agricultural salinity problems facing California · Rice damage from salinity in Sacramento Valley...
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Agricultural salinity problems facing Agricultural salinity problems facing CaliforniaCalifornia
Steve Grattan, Ph.D.Steve Grattan, Ph.D.Department of LAWRDepartment of LAWR
University of California, DavisUniversity of California, Davis
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Central Valley of CaliforniaCentral Valley of California
San J
Sierra Nevada(Granite rock; low salts)
San Joaquin Valley
Sacramento Valley
Coastal Range(Sedimentary rock; high salts)
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Sierra Nevada Mountains
Low EC irrigation water
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High Saline Water TablesHigh Saline Water Tables
San J
Sierra Nevada(Granite rock; low salts)
San Joaquin Valley
Sacramento Valley
Coastal Range(Sedimentary rock; high salts)
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Master DrainMaster Drain
Completed
Not completed
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Low salinewater
Traditional crops(non-saline)
Salt-tolerant cropsAnd forages
Halophytes
Solar Evaporator
Increasing salinity
Sequential Reuse
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Search for salt tolerant forages
High salt toleranceHigh biomass productionHigh forage quality
Forages in sand tanks at the US Salinity Lab irrigated with either 15 or 25 dS/m synthetic drainage water 2001-2002
Desirable characteristics:
‘Jose’ tall wheatgrass
Bermuda grass
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Livestock performance on sites irrigated
with saline drainage water (high Se/Mo)
Cattle grazing on Bermuda grass at
Westlake site, (July 2002) 160 steers
on 62 acres
‘Jose’ Tall wheatgrass Red Rock Ranch (2008)
UC Davis, USDA-ARS, Fresno State
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Rice damage from salinity Rice damage from salinity in Sacramento Valleyin Sacramento Valley
Scardaci et al., 2002
Upper Basin
Lower Basin
Evapo-concentration
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Drained farm land Imperial and Coachella Drained farm land Imperial and Coachella ValleysValleys
NovemberNovember--March March Temperature: 20Temperature: 20--25 C25 C
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R. Cummins photo
Salton SeaSalton SeaImperial Valley
Coachella ValleyR. Cummins photo
5 million tons of salt added 5 million tons of salt added each yeareach year……plus Seplus Se
Recreational uses include fishing, boating, swimming, camping
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Sea water intrusionSea water intrusion
Threatens coastal agriculture such as Monterrey, Threatens coastal agriculture such as Monterrey, Santa Maria, Lompoc, Oxnard, Los Angeles Santa Maria, Lompoc, Oxnard, Los Angeles (vegetable crops, commercial nurseries, and tree (vegetable crops, commercial nurseries, and tree crops)crops)
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Monterey County
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Salt sensitive Salt sensitive crops grown in crops grown in CaliforniaCalifornia’’s s coastal valleyscoastal valleys
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Salinity in CaliforniaSalinity in California’’s Sacramentos Sacramento--San Joaquin DeltaSan Joaquin Delta
Tides and river flows Influence salinityin Delta
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Recycled municipal waste waterRecycled municipal waste water
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CSIP (Castroville Sea Water Intrusion Project) CSIP (Castroville Sea Water Intrusion Project) Service AreaService Area
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Suitability Study ofSuitability Study ofNapa Sanitation DistrictNapa Sanitation District(NSD) Recycled Water(NSD) Recycled Waterfor Vineyard Irrigationfor Vineyard Irrigation
100%100%
50%50%
Soil Salinity (Soil Salinity (ECeECe, , dS/mdS/m))0 2 4 6 8
1.51.5
0.8-1.3 dS/m
UCCE study, 2006
Yie
ld Grape yields in relation to salinity
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Salt management guideSalt management guide(Ken (Ken TanjiTanji, editor; UCCE and USDA), editor; UCCE and USDA)
Interactive CD that provides
Basic information on salinity management, landscape plant salt-tolerance, design and re-design of landscape systems based on different soil types, plant-water demand, plants with different tolerances
Available: DWR, WateReuse, LADWP, City of Cerritos, So Cal Salinity Coalition, West basin MWD, Central basin MWD, National water Research Inst
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CaliforniaCalifornia’’s futures future
Reduction in good quality irrigation waterReduction in good quality irrigation waterIncreased use of municipal wastewaterIncreased use of municipal wastewater
Increased degradation of coastal ground Increased degradation of coastal ground waterswaters
Increased threat to Increased threat to salinizationsalinization of deltaof deltaSalinity impacting high value, salt Salinity impacting high value, salt
sensitive cropssensitive cropsExpansion of desalinizationExpansion of desalinization