Physical and Cultural Weed Control Working Group of - European ...

9 th EWRS Workshop on Physical and Cultural Weed Control 36
Samsun, Turkey, 28 – 30 March 2011
Control treatment without Velvet leaf sesame leaf area index was significantly increased 12
plants m −2 Velvet leaf, sesame leaf area index less than 53 percent without Velvet leaf control
treatment were recorded. Sesame average LAI in treatments 0, 4, 8 and 12 plants m −2 respectively
1.51, 0.88, 0.72 and 0.71 respectively (Table). Probably by increasing competition between species
density Velvet leaf stronger and one of the factors in this competition, increasing weed leaf area
index compared to sesame has been able maximum efficiency of light sources to increase LAI to
create and decreases LAI is sesame. Sadeghi et al. (2002 and 2003) also found that leaf area index
greater impact on weed dry weight loss products and therefore have more competitive power will be
more soybeans. Probably by increasing plant population density of the final leaf area index per unit
area is increased if Morrison et al. (1990) stated that in the same plants that grow in less space, the
amount of dry matter per unit area and length of their growing larger and thus had greater LAI.
Main stem diameter: maximum diameter of the treated sesame shoot without Velvet leaf weeds
were recorded. The density of 12 plants per square meter Velvet leaf, 27 percent of Sesame stem
diameter less than the control treatment showed no weed. Average stem diameter in treated sesame
zero, four, eight and 12 plants m −2 respectively 7.11, 5.99, 5.25 and 5.18 mm, respectively (Table).
Appears to increase competition and interaction between species, has been able Velvet leaf its
negative effects on the main stem diameter Sesame to create and cause weakening in these traits are
treatments. Abdollahi and Bararpoor (2007) showed that the densities of the soybean cultivar
Williams Velvet leaf density 0.25 Velvet leaf m row soybean plant, stem diameter compared to 11
percent weed-free treatment reduced these results show that the competitive power Velvet leaf
much weed. Kim and Moody (1980) as they also increase the density of rice stem thickness is
reduced.
Branch number: 100 kg treated ha increased 15 percent from the branch number 3.69 in
treatment number 50 kg ha −1 to 4.36 quarters were branch number (Table). Number of branches,
one of the important performance characteristics are increasing nitrogen has shown a positive
response. Paparimoghaddamfard (2000) reported nitrogen fertilizer quite significant impact on crop
characteristics such as number of branches per plant is sesame. In weed control treatment without
Velvet leaf most number of branches and sesame were caused in 12 plant density Velvet leaf
Sesame branch number to 27 percent rate with no weed control treatment decreased. Average
number of branches in the treated sesame seeds0, 4, 8 and 12 plants m −2 respectively 4.83, 4.17,
3.59 and 3.51 the number (Table). Any increase in space to form a sub-category with the lowest
Sesame competitive conditions and vice versa, the number of branches of positive and negative
effects of sesame has established itself. Sadeghi et al. (2002 and 2003) found that in determining the
share of each of the attributes of soybean in the ability to compete with weeds, whatever the number
of branches is higher, more effective on weight loss, dry weeds have and thus the power of
competition more weeds will be more. Kim and Moody (1980) and Alhani (2006) showed that
increasing plant population density reduced the number of secondary branches.The final dry aerial:
Most final dry weight in sesame without weed control treatment was Velvet leaf. Any Velvet leaf
weed density increased final dry weight also decreased sesame; If Velvet leaf at 12 plants m −2
decreased 20 percent compared to sesame final dry weight with no weed control treatment was.
Average dry weight in the final treatment Sesame 0, 4, 8 and 12 plants m respectively in 2969,
2769, 2470 and 2378 kg ha −1 respectively (Table). Sadeghi et al. (2002 and 2003) found that in
determining the share of each of the attributes of soybean in the ability to compete with weeds,
whatever the total amount of dry matter is higher, more effective on weight loss, dry weeds have
and thus the power of competition more weeds will be more. Andy and Larry (1997) also showed
the impact of weeds on crop canopy and associated products increased with was Increasing canopy
biomass and successfully compete.Hagood et al. (1980) in a study reported that the density of 2.4
to 40 plants m −2 Velvet leaf decrease in dry weight final.Abdollahi and Bararpoor (2007) also
showed that the effect of density on growth and yield Velvet leaf soybean cultivar Williams, density
0.25 Velvet leaf plant dry weight in soybean respectively, 6.4 percent compared with weed-free
treatment to reduce said.