dalia erez-reifen. 1,2 , laor y. 1 , raviv m. 1 , rubin b. 2 and eizenberg h. 1
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The 2 nd International Conference on: Novel and Sustainable Weed Management in Arid and Semi-Arid Agro-Ecosystems. Soil application of olive mill wastewater as an ecological approach for weed control in sustainable agricultural systems. - PowerPoint PPT PresentationTRANSCRIPT
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Dalia Erez-Reifen.1,2, Laor Y.1, Raviv M.1, Rubin B.2 and Eizenberg H.1
1Agricultural Research Organization, Newe Ya'ar Research Center, Ramat-Yishay, Israel. 2Robert H. Smith Faculty of Agriculture, Food and Environment The Hebrew University of Jerusalem, Israel.
Soil application of olive mill wastewater as an ecological approach for weed control in
sustainable agricultural systems
The 2nd International Conference on: Novel and Sustainable Weed Management in Arid and Semi-Arid Agro-Ecosystems
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Most olive oil production is concentrated in Mediterranean countries
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Products of the oil production process
Olive mill solid waste Olive leaves
Olive mill waste water
Olive oil
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Traditional olive mill: discontinuous press extraction
Crushing and malaxing
Extracting oil from paste
Separation
Storage - bottling
Liquid extraction
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Transition from traditional to modern extraction techniques
Around the 80’s, most of the small traditional olive mills were replaced by large ones with high capacity of daily
processing .
Continuous plants need higher amount of process water and give rise to the production of huge amounts of OMW – olive mill wastewater.
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3.0-5.9 pH
40,000-220,000 COD (mg/L)23,000-100,000 BOD (mg/L)
1-103 Total solids (g/L)1-23 Fats (g/L)
0.002-80 Polyphenols (g/L)0.78-10 Volatile organic acids (g/L)0.3-1.2 Total nitrogen (g/L)
Olive mill wastewater:general characteristics
Much larger than allowed in domestic
sewage
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olive mill waste as an environmental contaminant
However, from lack of cost-effective
alternatives un-controlled release into the
environment and contamination of rivers
and water resources are common
regulations: discharging directly to the sewagesystem or to the environment is not allowed
(COD>>>2,000 mg/L).
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Controlled land spreading of OMW
exploited as organic fertilizer increase soil organic matter promote microorganism activity Improve soil structure
phytotoxicity and biotoxicity increased salinity ground water contamination
Con
Pro
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Solutions
At present:OMW = Environmental problem
Engineered systemsOMW=Unwanted waste
Agricultural reuseOMW=Resource
natural alternative to
synthetic herbicides
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Apart from potassium soup (soft soup) and acetic acid (vinegar) – which are expensive
and not very efficient, there are no organically acceptable herbicides
The growing trend of consumers worldwide is to reduce chemical
herbicide application
Reduction in olive yield Reduction of plant vigorIncreased risk of disease
Weeds in olive orchards
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Roman Agricultural Writer
Marcus Porcius Cato (234-148 BCE)
Uses for Amurca (omw)Make a threshing floor as
follows: Dig over the site, then drench with
amurca and allow to soak in, then break up the
ground thoroughly. Then level, and pound with a rammer. Finally drench again with amurca and
allow to dry. If you make it in this way, ants will not damage it and weeds
will not grow
The oldest evidence of the herbicidal nature
of olive mill waste
On agriculture - Cato
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Research Objectives• Evaluate the efficacy of OMW as a bio-herbicide.
• Optimize modes of application and rates of OMW.
• Evaluate the response of various weed species to OMW applications.
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Experimental design
Levels Treatments Factor
3 PPI, PRE, POST Application modes
4 0, 20, 80, 160 (m3/ha) Application levels
3Daucus carota ,Silybum marianum, Phalaris brachystachys
Weed species
5 Replications
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Application modes :
POST
PRE
PPI
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Data collection:
Seedling, emergence and height were monitored periodically
Final biomass
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PRE – seedling emergence
0 m3/ha-1 20 m3/ha-1 80 m3/ha-1 160 m3/ha-1
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Emergence time course of Sylibum marinatum – PRE and PPI
PRE
Cum
ulat
ive
emer
genc
e (%
of E
max
)
Time from sowing (days)───── 0 m3/ha───── 20───── 80───── 160
PPI
0 5 10 15 20 25 300
20
40
60
80
100
120
0 5 10 15 200
20
40
60
80
100
120
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The influence of PPI OMW application on Phalaris biomass
PPI control
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0 2 8 160
4
8
12
16 a
bb
c
a
b
c c
pre ppi
The effect of different levels of OMW application on phalaris DW
OMW dose m3/ha
Dry
wei
ght p
er p
ot (g
)
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Heig
ht (c
m)
Time (days)
0 20 40 60 80 1000
10
20
30
40
500 2
8 16
PRE PPI
0 20 40 60 80 1000
10
20
30
40
500 2
8 16
The effect of omw on phalaris brachystachys developement
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In conclusion• Omw application at and above 80 m3/ha effectively
inhibits both weed emergence and development.
• POST treatments did not significantly injure weeds.
• PRE treatments severely reduced seedling emergence of dicot species, less reduction was observed in P. brachystachys emergence
• PPI treatments moderately affected weeds emergence, yet they significantly affected weed development and final biomass.
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OMW effect under field conditions.
• Three beds were constructed between the rows of olive trees.• 14 "min plots“ 2x4 m randomly divided to:Control -no OMW,
PRE -surface spreading of 80 m3/ha, PPI- surface spreading of 80 m3/ha, incorporated to 10 cm depth, using a rotary tiller. A row of Phalaris seeds were sown in each plot and plant biomass was monitored.
• The upper soil layer was sampled using an auger at three intervals: 0-10, 20-20 and 20-30 cm depth.
• PH, EC, dissolved organic carbon (DOC) and total phenols were analyzed in saturated paste extracts.
.
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PRECONTROL
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Effect of OMW application on Phalaris DW under field conditions
ba
a
0
0.2
0.4
0.6
0.8
C PPI PRE
b
a
a
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Enrichment of the top soil layer with DOC and TP as affected by OMW application
PRE
PPI
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In conclusion• Omw application at 80 m3/ha reduced weed
biomass under field conditions but only pre treatment’s effect was statistically significant.
• Both application modes caused a significant increase of Ec, DOC and total phenols as compared with control. This impact was reduced gradually with depth and time.
• Tillage seemed to immobilize OMW constituents within the top soil layer.
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EWRS for the scholarship
Newe Ya’ar, the department of Weed Research:Dr. Joseph Hershenhorn, Dr. Radi Ali, Dr. Daniel Joel,
Evgeny Smirnov, Tal Lande, Guy Achdari,
Dr. Evgenya Dor, Dr. Dina Plakhin
The faculty of agriculture,Weed lab
My fellow students
PRECONTROL
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