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by
H. Tavakoli |
Total Records (
2 ) for
H. Tavakoli |
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H.R. Tavakoli Kakhki
,
M. Kazemi
and
H. Tavakoli
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In order to study the effect of seed size on seed vigor
index of wheat, a factorial experiment based on a completely randomized
design was arranged with four replications at the laboratory. The experiment
had two factors. The first factor consisted of 13 wheat genotypes and
the second factor included seed size at four levels (1.5, 2, 2.5 and 3
mm in diameter). According to the results, germination percentage, germination
rate, root and shoot length, shoot/root length ratio were affected by
seed size and genotypes (p<=0.01). Also it revealed, that there were significant
correlation (R = 0.85; p<=0.01) between seedling growth rates and seed
size treatments. Stepwise regression method was indicated that, seed size
was the first (x1) and shoot length was the second (x2)
independent variable that could be used to describe the trend of variation
in seedling growth rate as dependent variable (Y) (R2 = 0.85).
It was observed that by increasing seed size and shoot length, seedling
growth rate was increased. As a result, it was concluded that seed size
and shoot length are two factors that strongly affect seedling growth
rate and could be used to evaluate and assess wheat genotypes and its
improvement programs. |
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H. Zareiforoush
,
M.H. Komarizadeh
,
M.R. Alizadeh
,
H. Tavakoli
and
M. Masoumi
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In order to predict the extent of mechanical damage of rice kernels during de-husking, milling, and other subsequent storage projects, information on such engineering properties of paddy grains as force and deformation curve must be provided. In this research, fracture resistance of paddy grain was determined in terms of grain rupture force and energy. The paddy grains were quasi-statically loaded in horizontal and vertical orientations at three moisture content levels of 8, 11, and 14% (w.b) and two loading rates of 5 and 10 mm min−1. In the current study, 12 treatments were performed as randomized complete block design with 10 replications. Based on the results obtained, as the moisture content of the paddy grain increased from 8 to 14% (w.b), the force required for initiating grain rupture decreased from 167.70 to 88.33 N and 43.55 to 21.68 N, and the energy absorbed at grain rupture increased from 13.08 to 34.39 mJ and 10.38 to 26.98 mJ, for horizontal and vertical orientations, respectively. This showed that the grains are more flexible in horizontal orientation. Furthermore, both the rupture force and energy decreased as the loading rate increased from 5 to 10 mm min−1. |
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