Some of Abstracts of published papper of this department :


Effect of deficit irrigation in the early season. on the sugar beet growth indexes
1Jahad akbar, M. R., 1 H. R. Ebrahimian.,2 S. Hagrasoliha and 3 S. Y Sadeghian
1-Agriculture Research center of Esfahan 2- Technology Universty of Esfahan 3- Sugar Beet Seed Institue

ABSTRACT:
  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 .

ABSTRACT:
  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


ABSTRACT:

  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.
 

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