© Benaki Phytopathological Institute
Marinan-Arroyuelo
et al.
68
Table 3.
Results from the cotton trial (Greece, 2011).
Treatments
Yield
(Kg/ha)*
Labour
for hand
weeding
(hr/ha)*
Yield
value
(€/ha)
1
Weed
control
costs
(€/ha)
2
Benefit/
Cost
ratio
(€/€)**
Labour
return value
(€/hr)***
Untreated control
254 c
152
0
na
3 Hand weedings (3 hw)
4039 a
503 a
2423
2515
0.9
4.5
Pendimethalin 1638 g/ha
1812 b
1087
111
8.4
Pendimethalin 1638 g/ha + 3 hw 4109 a
143 b 2465
826
2.8
9.6
Pendimethalin 1956.5 g/ha
2513 b
1508
118
11.5
Pendimethalin 1956.5 g/ha + 3 hw 3364 ab 96 b
2018
598
3.1
5.3
Pendimethalin 1638 g/ha
+ fluometuron
2743 ab
1646
164
9.1
Pendimethalin 1638 g/ha
+ fluometuron + 3 hw
4251 a
86 b
2551
594
4.0
10.5
1
Average price paid to Greek cotton growers in 2011 0.60 €/Kg (based on industry sources).
2
Labour cost for hand weeding (payment 5 €/hr, based on local sources) + Value of herbicide (Stomp 17 €/L,
Cottonex 9 €/L) + Cost of application (30 €/ha for Cottonex and 50 €/ha for Stomp).
* Means of three replicates. Values within a column followed by the same letters are not statistically different at
P=0.05.
** Benefit/Cost ratio for a treatment (€/€) = (Yield value of the treatment – Yield value of untreated control)/Weed
control costs of the treatment.
*** Labour return value for a treatment (€/hr)= (Yield value of the treatment with hand weeding – Yield value of
the treatment without hand weeding)/Labour for hand weeding.
Table 4.
Results from the two broccoli trials (Greece, 2010-11).
Treatments
Yield
(Kg/ha)
Labour for
hand
weeding (hr/
ha)*
Yield
value
(€/ha)
1
Weed
control
costs
(€/ha)
2
Benefit/
Cost
ratio
(€/€)**
Labour
return
value
(€/hr)***
Experiment from Dec. 2010 to April 2011
Untreated control
1607 c
1768
0
na
3 Hand weedings (3 hw)
1797 c
151a
1977
755
0.3
1.4
Pendimethalin 1137.5 g/ha
2205 b
2425
92
7.1
Pendimethalin 1137.5 g/ha + hw 2344 b
39b
2578
287
2.8
3.9
Pendimethalin 1365 g/ha
2490 a
2739
101
9.6
Pendimethalin 1365 g/ha + hw 2594 a
21b
2853
207
5.2
5.4
Experiment from March to May 2011
Untreated control
1359 c
1495
0
na
3 Hand weedings (3 hw)
1677 c
134a
1845
670
0.5
2.6
Pendimethalin 1137.5 g/ha
2005 b
2205
92
7.7
Pendimethalin 1137.5 g/ha + hw 2319 b
32b
2551
252
4.2
10.8
Pendimethalin 1365 g/ha
2444 ab
2688
101
11.8
Pendimethalin 1365 g/ha + hw 2688 a
14c
2957
171
8.5
19.2
1
Farmer’s price for broccoli 1.10 €/kg (based on market sources).
2
Labour cost for hand weeding (5 €/hr based on local sources) + Value of herbicide (Stomp 42 and 51 €/ha
depending on rate) + Cost of application (50 €/ha for spraying and incorporation).
* Means of three replicates. Values within a column followed by the same letters are not statistically different at
P=0.05.
** Benefit/Cost ratio for a treatment (€/€) = (Yield value of the treatment – Yield value of untreated control)/Weed
control costs of the treatment.
*** Labour return value for a treatment (€/hr)= (Yield value of the treatment with hand weeding – Yield value of
the treatment without hand weeding)/Labour for hand weeding.
