Abstracts of published papper of this department :
Effect of deficit irrigation in the early season. on the sugar beet growth
1Jahad akbar, M. R., 1 H. R. Ebrahimian.,2 S. Hagrasoliha and 3 S. Y
1-Agriculture Research center of Esfahan 2- Technology Universty of
Esfahan 3- Sugar Beet Seed Institue
Saving in irrigation water is important in the early season of sugar
beet. The effect of early season deficit irrigation on the sugar beet
growth indexes was investigated in Kabotarabad Agricultural Research
Station (Esfahan) in 1998. The soil texture was silty clay and the
experiment design was randomized complete block with 4 replications. Six
irrigation regimes were applied after: 1)100 mm(check), 2)200 mm, 3)300
mm, 4)400 mm, 5)500 mm and 6)600 mm evaporation from class A pan. The
results showed that both leaf area index (LAI) and foliage dry matter (DM
top) of sugar beet reduced when the length of irrigation intervals were
increased. The top growth rate (CGR top) of well watered beet was greater
than that subjected to water stress in the early growing season. The CGR
top of 100 to 500 mm treatments showed more or less the same pattern,
while the 600 mm one exhibited another pattern as compared to the other
irrigation treatments. This was probably due to severe of water stress.
The CGR top of sugar beet subjected to 600 mm treatment was less than the
other treatments. When beet plants were received sufficient water in the
early season, their CGR top reached zero, but the CGR root of these plants
were maximum. Changes of DM root for all treatments had a sigmoid pattern
and by increasing of water stress the DM root decreased. The reason may be
due to decrease in carbohydrates transportation from the leaves. Regarding
this study , we can concluded that third and fourth irrigation interval
time is determined on the base of 500 mm A-pan. The saving water is then
contributed to other cultures.
Effect of Irrigation delay after crop emergence in sugar beet cultivation
Jahad Akbar M. R, M. Aghdaie & H. R. Ebrahimian.
Agricultural Research center of Esfahan .
In semiarid regions of Iran one of the crop water management for spring
plant crops is delaing irrigation after emergence. This is due to
simultaneous cereal and spring planted cropwater requirement. A field
study was conducted to study the effect of delaying first post emergence
irrigation on root yield, quality and growth trend using a RCB replicated
four times. The irrigation treatments were first post emergence irrigation
(FPEI). Irrigation after (I1) 100mm(check), (I2) 200mm, (I3) 300mm, (I4)
400mm, (I5) 500mm, (I6) 600 mm Cumulative class A pan evaporation, form
1997 to 1998.
In 1997 the effect of treatments were not significant on root & sugar
yields, but sugar content increased by delay FPEI.
In 1998 by delaying FPEI the root & sugar yield decreased significantly.
The increase of sugar content by delaying FPEI, were higher in I4 to I6
from another treatments. Sugar yield in I6 treatment was not compensated
respect to other treatments. Therefore than I5 treatment is recommended to
save irrigation water, and to allocate the save water to cereal grains.
Correlation of stability parameters in sugar beet
Hamid Reza Ebrahimian1, Abdolmajid Rezaei2 , Mohammad Reza Jahadakbar3
1,3-Isfahn Agrecultural Research Center 2-Isfahan University Of Technology
To study the correlation between stability parameters, a series of
experiments were conducted –using a randomized complete block design with
four replications, in 11 locations over four years. Twanty commercial
sugar beet cultivators were studied. Roor yield, sugar cotent and white
sugar yield were measued and recorded for all cultivars in all
environmentals. combined analysis of variances were performed and based on
the anova stability parameters, including environmental variance,
coefficient of variation(CV), ecovalance, stability variance of Shukla,
deviation from regression, and coefficient of determination(R2) were
calculated. And their relationships were studied.
The combined analysis showed that significant genetic variations exist for
traits of interest among cultivars. Significant differences were also
observed between environments and environmern×cultivar interactions for
traits, cultivar×year and cultivar × location interactions, for white
sugar content were statistically significant. No significant correlation
were found between stability parameters and mean of studied traits.
Therefore, stability parameters could not simultaneously select for high
yielding and stable cultivars.
Correlation coefficients between coefficient of determination, and
deviation from regression were statistically significant and results
showed that each of them could similarity select the stable genotype.
Relationship between Deviation from regression with ecovaiance and
stability variancewere significnt for intrest traits. Therefore
coefficient of determination , deviation from regression , ecovalance and
stability variance are similar for selection of stable genotype.