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Articles by Ahmad Tobeh
Total Records ( 3 ) for Ahmad Tobeh
  Manochehr Shiri-e-Janagrad , Ahmad Tobeh , Abazar Abbasi , Shahzad Jamaati-e-Somarin and Saeid Hokmalipour
  To study, the growth of different shoot parts of two potato cultivars under the effects of different levels of N fertilizer, a split-plot experiment was conducted based on Completely Randomized Block Design (CRBD) with four replications in Ardabil agriculture research station in 2007. Cultivars included Agria and Satina and N fertilizer levels included control, 80, 160 and 200 kg N ha-1. Results showed that Agria was significantly superior in all traits except stem length. The effect of N on all traits was significant. As N level increased, auxiliary branch number and plant height increased. The maximum stem and leaf biomass and leaf number was achieved in 160 kg N ha-1 treatment and the highest main stem number was achieved in 80 kg N ha-1 treatment. The yield difference among 80, 160 and 200 kg N ha-1 was insignificant. Over time auxiliary (not main) branch number, plant height, stem dry weight and tuber yield increased. Leaf number and leaf biomass declined after 94 DAP (Days After Planting). Generally, potato is a crop that strongly affected by nitrogen rates. But the effect of nitrogen on aboveground was more violent than tubers. Therefore, a range of 80-160 kg N ha-1 is recommended.
  Nayer Bahavar , Ali Ebadi , Ahmad Tobeh and Shahzad Jamaati-E-Somarin
  This experiment was conducted to determine water use efficiency of chickpea (cv. Arman) under water deficit condition and different mineral N application. The experiment was arranged in growth chamber of Mohaghegh Ardabili University, Ardabil, Iran, in 2007, with three nitrogen levels (25, 50 and 75 kg N ha-1 as urea) and five irrigation regimes (soil water content of 25, 45, 65, 85 and 100% field capacity). The experiment was laid out in randomized complete block design (factorial) experiment with three replications. Results showed that water stress affect Water Use Efficiency (WUE), Relative Water Content (RWC), Leaf Area (LA), leaf number after stress induction, biomass (above ground tissues) and root/shoot ratio (R/S) traits. Application of Mineral nitrogen increased water use efficiency, RWC, leaf area and biomass. Maximum amount of WUE, RWC, biomass and LA obtained from 75 kg N ha-1 under water deficit condition. This experiment revealed that nitrogen fertilizer could reduce many detrimental effects of water stress. These results also suggest that using of nitrogen fertilizer in water deficit conditions (such as dry land farming areas) increase tolerance of plants to stress.
  M. Panahyan-e-Kivi , A. Ebadi , Ahmad Tobeh and Sh. Jamaati-e-Somarin
  To evaluate the yield and yield components of lentil genotypes under drought stress conditions, an experiment was conducted in Ardabil Agricultural Research Station during 2005 in a split-plot experimental design based on Completely Randomized Block Design (CRBD) with four replications. The treatments included four irrigation levels [(I1) irrigation on the basis of 60 mm evaporation, (I2) irrigation on the basis of 80 mm evaporation, (I3) irrigation after 100 mm evaporation from basin class A, and (I4) no irrigation] as the major factor and three lentil genotypes (Ardabil local variety, ILL4400 and ILL6212) as the minor factor. The results showed that irrigation water deficit during lentil flowering led to the decrease in pod number, grain number per plant, grain weight, grain yield and harvest index, so that I2 level of genotype ILL4400 had the highest yield followed by ILL 6212 and Ardabil local variety and I4 had the lowest yield. I3 level of ILL6212 had the highest harvest index and genotypes ILL4400 and ILL6212 had the highest grain number per plant.
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