Dalia Erez-Reifen. 1,2 , Laor Y. 1 , Raviv M. 1 , Rubin B. 2 and Eizenberg H. 1 1 Agricultural Research Organization, Newe Ya'ar Research Center, Ramat-Yishay, Israel. 2 Robert 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 2 nd International Conference on: Novel and Sustainable Weed Management in Arid and Semi-Arid Agro-Ecosystems
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Dalia Erez-Reifen. 1,2, Laor Y. 1, Raviv M. 1, Rubin B. 2 and Eizenberg H. 1 1 Agricultural Research Organization, Newe Ya'ar Research Center, Ramat-Yishay,
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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
Most olive oil production is concentrated in Mediterranean countries
Products of the oil production process
Olive mill solid waste Olive leaves
Olive mill waste water
Olive oil
Traditional olive mill: discontinuous press extraction
Crushing and malaxing
Extracting oil from paste
Separation
Storage - bottling
Liquid extraction
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.
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
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
Seedling, emergence and height were monitored periodically
Final biomass
PRE – seedling emergence
0 m3/ha-1 20 m3/ha-1 80 m3/ha-1 160 m3/ha-1
Emergence time course of Sylibum marinatum – PRE and PPI
PRE
Cu
mu
lativ
e e
me
rge
nce
(%
of E
ma
x)
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
The influence of PPI OMW application on Phalaris biomass
PPI control
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
gh
t p
er p
ot
(g)
Hei
ght (
cm)
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
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.
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.
.
PRECONTROL
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
Enrichment of the top soil layer with DOC
and TP as affected by OMW application
PRE
PPI
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.
EWRS for the scholarship
Newe Ya’ar, the department of Weed Research:
Dr. Joseph Hershenhorn, Dr. Radi Ali, Dr. Daniel Joel,