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Articles by R. Zabihi-e-Mahmoodabad
Total Records ( 5 ) for R. Zabihi-e-Mahmoodabad
  Sh. Jamaati-e-Somarin , A. Tobeh , M. Hassanzadeh , M. Saeidi , A. Gholizadeh and R. Zabihi-e-Mahmoodabad
  In order to investigate the plant density and nitrogen level on nitrogen use efficiency components (agronomical, physiological, apparent recovery and nitrogen use efficiency), the amount of nitrogen uptake by plant, yield and yield components of potato (Solanum tuberosum L.) Agria cultivars` tuber, a factorial experiment based on randomized complete block design was conducted in Ardabil, Iran, in 2006 with three replications. Factors were adjusted for the nitrogen level (0, 80, 160 and 200 kg ha-1 net nitrogen) and plant density (5.5, 7.5 and 11 plant m-2). Results showed that with increasing the nitrogen levels and plant densities agronomical nitrogen use efficiency, physiological nitrogen efficiency and nitrogen use efficiency were decreased and apparent recovery nitrogen efficiency was increased. The most nitrogen uptake in plant was observed at the 200 kg ha-1 net nitrogen. The most yield and number of tuber per unit area were gained at the 80 and 160 kg ha-1 net nitrogen. Increasing the plant density resulted in increasing in the tuber yield per unit area and the rate of nitrogen up to the 160 kg ha-1 net nitrogen. So, application of the 80 kg ha-1 net nitrogen and plant density of 11 plant m-2 is recommended to get highest yield with the most nitrogen use efficiency.
  Sh. Jamaati-e-Somarin , A. Tobeh , M. Hassanzadeh , S. Hokmalipour and R. Zabihi-e-Mahmoodabad
  In order to investigate plant density and nitrogen fertilizer on nitrogen uptake from soil and nitrate pollution in potato tuber cu. Agria, a factorial experiment based on randomized complete block design with three replications was carried out in Ardabil, Iran, in 2006. Factors were nitrogen levels (0, 80, 160 and 200 kg ha-1 net nitrogen) and plant densities (5.5, 7.5 and 11 plant m-2). Results showed that the most nitrogen uptake by plant aerial parts and the most nitrate concentration in dry and fresh tuber weight were observed at 200 kg ha-1 nitrogen, 11 plant m-2 and 200 kg ha-1 nitrogen, 5.5 plant m-2, respectively. At 160 kg ha-1 nitrogen (as equal to 80 kg ha-1 nitrogen) and 11 plant m-2, the most tuber and yield of tuber were gained. With increasing nitrogen application up to 160 kg ha-1, nitrogen uptake by tuber, number of tuber, tuber dry weight and mean tuber weight was increased. 160 and 80 kg ha-1 nitrogen jointly with density of 5.5 plant m-2, caused the most mean tuber weight per plant. So, utilization of 80 kg ha-1 nitrogen to reach highest yield and less nitrate pollution, density of 11 plant m-2 to gain seed tuber (because of reduction in tuber weight and size) and density of 7.5 plant m-2 for eating usages, are recommended.
  M. Hassanzadeh , A. Asghari , Sh. Jamaati-e-Somarin , M. Saeidi , R. Zabihi-e-Mahmoodabad and S. Hokmalipour
  In order to investigation of water deficit on drought tolerance indices of 27 sesame genotypes, a factorial experiment based on randomized complete block design was carried out in Moghan region in 2006 cropping year with three replications. Factors were: 27 sesame genotype (Karaj 1, Yekta, Oltan, Moghan 17, Naz takshakheh, Naz chandshakheh, Borazjan 2, Borazjan 5, Darab 14, Varamin 37, Varamin 237, Varamin 2822, Zoodrass IS, Hendi, Chini, Yellow white, 5089, Panama, DO-1, TF-3, TKG-21, J -1, RT-54, Hendi 9, Hendi 12, Hendi 14 and Jiroft) and irrigation (complete irrigation and irrigation until beginning of flowering). Results showed that Varamin 2822 genotype and Hendi 12 genotype in stress conditions had the highest yield stability about tolerance (TOL) and Mean Productivity (MP) indices, respectively. Regarding to Geometric Mean Productivity (GMP), Karaj 1, Oltan and Naz takshakheh were at highest level. Based on Stress Susceptibility Index (SSI), Varamin 237, Naz takshakheh, Naz chandshakheh, Oltan, Hendi 12, J-1, Panama genotypes and Jiroft line, were among mid-resistant and Zoodrass IS genotype was as sensitive one. Based on Stress Tolerance Index (STI), Varamin 2822, arranged as mid–resistant genotype. So, Karaj 1, Naz takshakheh, Varamin 237 and Varamin 2822 had highest rates (about mentioned indices) and are suitable for cropping under drought stress conditions.
  M. Hassanzadeh , A. Ebadi , M. Panahyan-e-Kivi , A.G. Eshghi , Sh. Jamaati-e-Somarin , M. Saeidi and R. Zabihi-e-Mahmoodabad
  In order to evaluate drought stress on relative water content (RWC) and chlorophyll content of 27 Sesame genotypes, a factorial experiment based on randomized complete block design with three replications was conducted in 2006 in Moghan region, Iran. Factors were 27 Sesame genotypes (Karaj 1, Yekta, Oltan, Moghan 17, Naz takshakheh, Naz chandshakheh, Borazjan 2, Borazjan 5, Darab 14, Varamin 37, Varamin 237, Varamin 2822, Zoodrass IS, Hendi, Chini, Yellow white, 5089, Panama, Do-1, TF-3 , TKG-21, J-I, RT-54, Hendi 9, Hendi 12, Hendi 14 and Jiroft) and irrigation levels (full irrigation and irrigation until flowering stage). Results showed that Varamin 2822 and Varamin 237 genotypes had the highest RWC of 84.100 and 81.217%, respectively. The most chlorophyll a content was observed in Hendi 9 genotype of 106.237, the most chlorophyll b in Karaj 1 genotype of 84.665 and the most chlorophyll total in Hendi genotype of 182.395 mg g-1 leaf fresh weight. It seems that Varamin 2822 genotype having the highest RWC and Hendi 9 and Hendi genotypes having the most chlorophyll a and chlorophyll total, respectively, are recommended for planting in arid and semi-arid conditions.
  M. Shiri-e-Janagard , A. Tobeh , A. Abbasi , Sh. Jamaati-e-Somarin , M. Hassanzadeh and R. Zabihi-e-Mahmoodabad
  In order to study water demand, vegetative growth and tuber grade of potato crop under water stress and different cultivation patterns in different drip irrigation regimes, a split plot experiment based on the randomized complete block design with three replications carried out at the Allarog Research Station, Ardebil, Iran, in 2004. Estimation of crop evapotranspiration was conducted by CROPWAT computer program based on the relationship between crop coefficient (Kc) and crop evapotranspiration. Different drip irrigation levels were 100, 80 and 60% of potato crop evapotranspiration. Different levels of cultivation patterns were: 1 row 75 cm on bed 75 cm (furrow to furrow), 2 rows 35 cm on bed 150 cm (furrow to furrow) and 2 rows 45 cm on bed 150 cm and sampling times were the third factor with 6 levels. It was found that yield and growth of aerial parts was significantly affected by water stress and sampling times. Cultivation patterns had only significant effect on above ground biomass. The maximum and the minimum values of most traits studied were observed at 100 and 60% crop evapotranspiration levels, respectively. Number of tubers with 28-50 mm and larger than 50 mm diameter in size were higher at 80 and 100% of full irrigation, respectively. Estimating of amount of water irrigation during irrigation period for 100, 80 and 60% of water irrigation were 558.7, 445.96 and 335.22 mm, respectively.
 
 
 
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