Dr. Francisco Pedrero Salcedo Department of Agricultural and Environmental Science University of Bari “Aldo Moro“ Irrigation Department CEBAS-CSIC Wastewater reuse for irrigation – summary of current and future research activities Workshop RECLAIMED WATER USE IN MEDITERRANEAN AGRICULTURE
34
Embed
Wastewater reuse for irrigation summary of current and future … · 2016-11-22 · Wastewater reuse for irrigation ... types of reclaimed water and crops.-The effect of using reclaimed
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Dr. Francisco Pedrero Salcedo
Department of Agricultural and Environmental Science
University of Bari “Aldo Moro“
Irrigation DepartmentCEBAS-CSIC
Wastewater reuse for irrigation – summary of current
and future research activities
Workshop
RECLAIMED WATER USE IN MEDITERRANEAN AGRICULTURE
Reclaimedwater use in agriculture
Pilot plants at PLOT LEVEL
Pilot plants at DISTRICT
LEVEL
New technologies
Disseminationand publicperception
Miscellaneousproblems
Irrigation Department water reuse projects
-A network of experimental plots in different locations and different
types of reclaimed water and crops.
-The effect of using reclaimed water on tree physiology, performance,
quality and safety of crops
- Effects on the long and medium term effect on soil salt accumulation,
unsaturated area and groundwater pollution.
Pilot plants at plot level
Use of reclaimed water and Regulated Deficit Irrigation (RDI) on mandarin and grapefruit
2008-2010Evaluate the agricultural impact of using
reclaimed water for irrigation of citrus trees under
optimum and deficit irrigation conditions and to
assess the use of GIS tools for planning and
management of water reuse projects.
A tendency to reduce the number of fruits on was detected under RW treatments.This reduction was more pronounced under regulated deficit irrigation (RW-RDItreatment).
Combined effects of RDI strategies and reclaimed water increased some fruitquality parameters on mandarin trees. [Vit.C] RDI-RW > RDI > Control treatments.
[Na], [B] and [Cl] exceeded the phyto-toxic levels in reclaimed irrigation-water.Although no toxic problems have been detected during the experiment, some mildtoxicity symptoms started appearing during the last year and therefore long termeffects could be more pronounced.
Irrigation with reclaimed water tends to accumulate salts within the plant rootzone. Therefore, careful monitoring is needed to avoid possible reduction in the soilagronomic properties.
Conclusions
Long term effects
Ayers and Westcot (1985) for citrus (ECe= 1.7 dS m−1)
Yield on mandarins
• After evaluating the validity of three indicators (gas exchange parameters,stem water potential and leaf chlorophyll content) our results showed theneed of seasonal measurements of leaf chlorophyll content as an importantdiagnostic indicator of salt stress on field crops of grapefruit.
• Phytotoxicity thresholds for Na, Cl and B that cause a decrease in citrusyields were established.
• Additionally, we observed salt accumulation at leaf level that could eventually lead to possible risks in crop sustainability in the medium to long term.
Conclusions
CtrJ OJ F M A M J A NS D
RDI
100 % ETc
50 % ETc
Dual-WaterJ OJ F M A M J A NS D
Regulated SalineIrrigation “RSI”
100 % ETc
ECw > 4ECw ≈ 1 ECw ≈ 1
ECw > 4 ECw > 4ECw ≈ 1
NEW treatments
Best Managements Strategies
ON THE OTHER HAND…
2007 2015
Water and Agriculture Research Platform CEBAS-CSIC
Grenhouses 860m2
a
f
e
b
c
d
Soil surface
• Research projects
- Agricultural reclaimed water use effects on horticultural crops
growing on soil and hidroponics.
- Water treatment prototypes testing
- Food safety risk and security studies.
- Emerging contaminants
- Sludge
• Enterprise collaborations
- Precision irrigation with soil and environmental sensor integration
• Visits, trainning days, international courses ,
dissemination, MsC, phD.
TOMATO
ZUCHINNI 3 LETTUCE, PARSLEY, CABAGGE,
BROCCOLI AND COURGETTE
PEPPER
IRIS complementary studies
Safety assessment of greenhouse hydroponic tomatoes and peppers irrigated with reclaimed and surface water
IRIS complementary studies
Fecal indicator microorganisms such as E. coli were found in relatively low levels in surfaceand reclaimed water. However, presumptive positive Salmonella spp. samples (prevalence7.7%) were found in both water sources.