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Articles by Farzad Paknejad
Total Records ( 6 ) for Farzad Paknejad
  Mohammad Nasri , Mansoreh Khalatbari , Hossein Zahedi , Farzad Paknejad and Hamid Reza Tohidi Moghadam
  For study the effects of different levels of irrigating according to the 0, 25, 50 and 75% of field capacity to the amount of food less demand’s elements in the number of 5 and Rapeseed (Brassica napus) line this experiment randomized complete block design had been executed in the field at 2002-2003 in the research field of agricultural university of Varamin, Azad University. The amount of the needed fertilizer had consumed according to the soil analysis of the test site. At the end of the research for determining the amount of each element in each caring, the leaf samples had transferred to the laboratory and the necessary examination had been performed. The result had been Variance analyzed with the help SAS software and the comparison of the data average had executed with the help of the multi amplitude test of Duncan. According to the results of Variance analysis, the difference of elements in the numbers and different lines of Rapeseed (Brassica napus) and the different levels of irrigating and the counter effect of these two factors had been meaningful in the level of 1% and among the numbers only the element of Sulphur had the statistical meaningful difference. The variety of Hyola-42 and Mohican had allocated the first and the last statistical class to itself orderly with the average of 1.94 and 1.03%. The varieties were not meaningful in the case of the amount percentage of boron and Zn in the dry substance of leaf. Also in this study the different levels of irrigation has been meaningful effects on the amount of percentage of the elements 3. With increasing of the intensity of drought stress from 75-0% the F.C amount of element have shown the decreasing amount and Sulphur had reached from 1.98-1.01% and the Zinc had reached to the 15.2 mg from 29.6% in the dry substance of the leaf. However the amount of the results had shown the reduction but they were meaningless in the case of statistic.
  Mohammad Nasri , Hossein Zahedi , Hamid Reza Tohidi Moghadam , Farshad Ghooshchi and Farzad Paknejad
  In order to study of changing of macro elements in water stress condition an experimental design was carried out to study effect of different levels irrigation (0, 25, 50, 75) percentage of Field Capacity (FC) on changing macro elements (N, P, K) in 5 rapeseed genotypes (PF7045-01, Symbol, Mohican, Hyola-42, Syn-1). The experimental design split plot in Randomized Complete Block with 4 replication at 2004. Investigation was carried out in Varamin university field research. The information gain about the yield grain, number of pods per plant, number of seeds per pods, weight 1000 grain, oil percentage and yield oil. At the end of investigation, for to valued quantity each element in each treatment, sample of leaf transmits in laboratory and valued quantity elements N, P, K. As result that in, quantity element in different levels irrigation and interaction between the both of them were significant. Interaction between genotypes and levels irrigation were significant at the 0.01%. Basically table of ANOVA in all of the treatment, drought stress were cause decrease quantity elements at different genotypes exception element N that with increase intensity drought stress, percentage that was increase in leaves. The yield impressed genotypes and drought stress levels. With increase intensity drought stress of 0.75-0%, mean Field Capacity decreased of 3340-1788 kg h-1. Between genotypes, Hyola-42 and Symbol with mean 3377.5 and 1947 kg h-1 were highest and the lowest yield respectively. Oil seed percentage didn’t impress on genotypes but with increase intensity drought stress, decreased quantity and mean were of 43.1%, at treatment irrigation 75% FC, to 40.2% in treatment irrigation 0% and 25% FC. With increase intensity drought stress, the quantity saturation fats and glucosinolates seed increased and quality oil decreased.
  Farzad Paknejad , Mojtaba Mirakhori , Majid Jami Al-Ahmadi , Mohammad Reza Tookalo , Ali Reza Pazoki and Parisa Nazeri
  Problem statement: Many cultivated area are situated in arid zone, where crop photosynthesis and productivity has limited by drought. Thus any treatment, such as methanol, that improve plant water relation and reduce stress impacts, could be benefit. Approach: In order to investigate effects of methanol application on some physiological properties of soybean under low water stress, a factorial experiment was done at Research Field of Faculty of Agriculture and Natural Resources, Islamic Azad University-Karaj Branch, Karaj, Iran, during 2008, based on a randomized complete block design with three replications. The first factor was different levels of methanol equal to 0 (control), 7, 14, 21, 28 and 35 volumetric percentage (v/v), which were used as foliar applications at three times during growth season of soybean, with 15 days intervals. The second factor was water stress conditions in two levels, based on depletion of 40 and 70% of available soil moisture. Some traits such as Grain Yield, Relative Water Content (RWC), chlorophyll fluorescence parameters and chlorophyll content were measured, one day before and after the third methanol application. Results: Chlorophyll content (Chl), GY, Electrolytes Leakage at second sampling, photochemical capacity of PSII (Fv/Fm), maximum and variable fluorescence (Fm and FV, respectively) were affected by water stress significantly (p<0.05). As drought severity was increased, mean values of photochemical capacity of PSII, Chl and RWC tend to decline, whereas minimum fluorescence (F0) and Electrolytes Leakage were increased. Methanol foliar application influenced significantly (p<0.05) Chl, RWC, Grain Yield, and all fluorescence parameters. There was a positive, high correlation between GY with maximum fluorescence, photochemical capacity and also Chl and RWC in both samplings. Conclusion: It seems applying methanol on water stressed soybean plants can reduce harmful effects of drought and improve plant potential to cope with stress.
  Seyedeh Soudabeh Shobeiri , Davood Habibi , Ali Kashani , Farzad Paknejad , Hossein Jafary , Majid Jami Al-Ahmadi , Mohamad Reza Tookalloo and Javad Lamei
  Problem statement: Mixed cereal-legume cropping can supply valuable forage in dry areas, as well as improving soil characteristics to approach sustainable farming systems in these regions. Approach: In order to comprise quality and quantity of produced forage and to determine the best planting ratio in a hairy vetch and barley mix cropping, a two year study was conducted during 2008 and 2009 in Zanjan Center for Research of Agricultural Science and Natural Resources, Zanjan, Iran, using these two forage crops in a completely randomized block design with five treatments and four replications. Hairy vetch and barley were single- or mix cropped at 100:0, 75:25, 50:50, 25:75 and 0:100 ratios. Results: Analysis of variance of two years data showed hay yield, absorbed N, P and K amounts and crude protein content varied among years and different planting ratio, significantly, with higher amounts in the second year. The highest dry matter yield, absorbed N, P and K and crude protein content were obtained in 50:50 planting ratio. The land equivalent ratio was more than one for all mix cropping treatments, with the highest value in 50:50 planting ratio, which also led to the highest LER in respect to crude protein. Conclusion: A 50:50 mixture of barley-hairy vetch can produce the highest dry forage yield, with a higher LER and the highest forage quality than sole cropping.
  Mojtaba Mirakhori , Farzad Paknejad , Foad Moradi , Mohammadreza Ardakani , Hossein Zahedi and Parisa Nazeri
  Problem statement: In order to evaluate drought stress and methanol on yield and yield components of soybean in field experiments with factorial experiment inform of a randomized complete block design with three replication in field faculty of agricultural of Islamic Azad University Karaj, at 2008. First factor were sprayed aqueous solutions 0 (control), 7, 14.21, 28 and 35% (v/v) methanol by 3 times during growth season of soybean with 12 days intervals on shoot of soybean. Second factor were drought stress condition in two levels 40 and 70% base of depletion available soil moisture. Approach: This study measured grain yield, biomass HI, 1000 grain weigh, high plants, number of branch, diameter of stem, number of pod on plant, number of hollow pod. Results: Results of the experiment indicated that significant differences exist (p>0.05) between sprayed of solution methanol on parameters. Results also showed that was significant (p>0.05) differences between effect of drought stress levels on measured parameters. Effect of aqueous solution 14, 21 and 28% (v/v) methanol on measured parameters was greater than other treatments. Foliar application of 14 and 21% (v/v) methanol increased leaf area index, crop growth rate, pod growth rate, leaf area duration, pod yield, seed yield, weight of 1000 kernel, mature pods per plants. Conclusion: The lowest grain yield obtained in control and 35% (v/v) methanol treatments. Interaction effects were not significant.
  Farzad Paknejad , Mohammad Nasri , Hamid Reza Tohidi Moghadam , Hossein Zahedi and Majid Jami Alahmadi
  Chlorophyll fluorescence quick variation can be used as a valuable index for evaluation of plants tolerance to environmental stresses. In order to evaluate chlorophyll quick fluorescence fluctuations of different wheat cultivars under water-limited condition, a factorial experiment with a randomized complete block design was performed in Karaj, Iran. Treatments were seven different irrigation regimes and three bread wheat cultivars with four replications. The measurements of Chlorophyll fluorescence parameters were done on flag leaves about three weeks after flowering. Photo-system II photochemical capacity was calculated from the ratio of variable fluorescence to maximum chlorophyll fluorescence (FV/FM). In addition, T1/2 and FV were evaluated and relative water content and flag leaf chlorophyll were also measured. Results showed that different irrigation levels affected the FV, FV/FM and T1/2 significantly (p<= 0.05), but have not any significant effect on F0 and FM. There was a significant difference between different varieties and irrigation levels in respect to chlorophyll content, RWC and grain. The means of FV/FM, FV, T1/2 and FM were declined as soil water content was decreased, but F0 was almost remained constant for all the treatments. High yielding varieties had higher T1/2, FM, FV/FM, FV, chlorophyll content and RWC values. The FV and FV/FM had highest and F0 had lowest correlation coefficients with grain yield. The existing synchronized pattern of variation in fluorescence parameters of all varieties indicates that high yielding varieties can avoid the negative effects of drought stress during grain filling period. The high correlation between fluorescence parameters and RWC confirm these findings.
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