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Articles by F. Abbasi
Total Records ( 6 ) for F. Abbasi
  F. Abbasi , M.A. Asoodar and M. Saadatfard
  This study investigated the effect of using stalk shredder, conservation tillage machines and seeding techniques on soil physical characteristics, seedling emergence, crop establishment and grain yield after corn harvesting in Dezfoul, Khouzestan province. Also soil moisture content, bulk density, cone index, soil mean weight diameter and sowing depth uniformity were recorded. A factorial split complete block design was applied with 3 replications. Treatments were including one pass, twice and no stalk shredder (disk) and tillage treatments including combination tillage and disk in main plots followed by flat and raised bed planting in subplots. Twice stalk shredder leaving 5740.3 kg ha-1 corn residue, increased soil moisture content after planting, it was also shown lower clod weight diameter (1.526 cm). The best sowing depth uniformity (44.84%) was the most effect of the stalk shredder treatments. Seedling emergence (89.2%) and yield (2.02%) were increased where combination tillage was applied. Raised bed planting was shown higher seedling and rate of emergence with 72.61 and 3.82% than flat planting, respectively. Therefore, combination tillage followed by twice stalk shredder and raised bed planting were the most beneficial treatments for wheat production under conservation tillage.
  A.A. Naseri , Y. Hoseini , H. Moazed , F. Abbasi and H.M.V. Samani
  Phosphorus (p) adsorption characteristics of 5 soil samples were studied in soils of Southeastern Iran during 2009/2010 cropping season. Some soil properties as well as selected P-adoption characteristics were studied in these soils, Results show for this study Freundlich adsorption isotherm has good match with phosphorus adsorbed data and has good R-square. Freundlich sorption isotherms were used to evaluate the P requirement of 5 soils in a lab study. The soils were medium to heavy textured, acidic in reaction and were highly calcareous. Amount of P sorbed by the soils increased with increasing P in equilibrium solution. Quantities of P retained on sod solid phase were significantly correlated (p<0.05) with clay content of the soils. Maximum P was sorbed by a soil that had the maximum (64%) Clay content. there were negative relationship between P adsorption capacity and SOC and Ca content of soils.
  F. Abbasi , M. Asmari and H. Arabshahi
  Because of low special resolution of General Circulation models, they can not predict weather and climate accurately. In this regards weather generator technique have been developed by climatologists to downscale GCM outputs into station scale. In this research, girded meteorological outputs of ECHO-G model including precipitation, maximum temperature, minimum temperature and radiation have been downscaled over 18 synoptic stations of Zagros during 2010-2039 with A1 scenario. Results show that the mean annual precipitation will be decreased by 2%, increasing of mean annual temperature by 0.4°C during period of 2010-2039. Maximum increase predicted to occur over Fars, Esfahan provinces. Also thresholds of heavy and extreme rainfall will be increased by 3 and 19%, respectively. In this regards in the future period, the rainfalls will be heavy and flash-flooded and there is a significant decrease in the amount of snow falls.
  H. Moazed , Y. Hoseini , A.A. Naseri and F. Abbasi
  Phosphorus (p) adsorption characteristics of 5 soil samples were studied in soils of Omidie, Southeastern Iran during 2009/2010 cropping season. The concentrations of the solutions were 4, 12, 25, 50, 70 mg P L-1. Some soil properties as well as selected P-adoption characteristics were studied in these soils. Results show for this study Langmuir adsorption isotherm has better match with phosphorus adsorbed data and has maximum R-square. Differences in P- adsorption was greatly influenced by Soil Organic Carbon (SOC), soil pH, exchangeable calcium, exchangeable aluminium. Regression analysis shows that SOC and Alsat were the highest predictors of P-adsorption in soils of the study site. There is need for inclusion of more soil chemical, physical and mineralogical properties in predicting soil P-adsorption to enhance reliability of information.
  A.A. Naseri , Y. Hoseini , H. Moazed , F. Abbasi , H.M.V. Samani and S.A. Sakebi
  The objective of the present study was to understand Phosphorus transport from soil columns at different water flux densities and to compare computer simulation results using HYDRUS-3D and the physical model against column-experiment data. Towards that end, two water flux densities (0.0075, 0.0065 m sec-1) and P concentration rates (33 mol cm-3) were used. The soil used has a silty clay- loam texture. The numerical model (HYDRUS-3D) successfully predicted P transport in the present experiment. Overall, the HYDRUS-3D model successfully simulated the water flow in the columns; however, it overestimated the final adsorbed PO4 concentrations in the soil. The present column experiment is useful for assessing relative behavior of P in increasing the movement of phosphorus ions out of the soil profile and into ground waters.
  H. Mahmoodzadeh , F. Abbasi and S. Rohani
  In vitro seeds germination and plantlet establishment of Zinnia elegans were studied in this report. The seeds of Z. elegans were sterilized and cultured on Murashige and Skoog (MS) solid media supplemented with 1-3 μM of 6-benzylaminopurine (BAP) or Kinetin (KIN) and 3% (w/v) sucrose. The presence of KIN in the medium significantly affects seeds germination. High percentage of seeds germination (up to 90%) was successfully achieved after 3 days of culture on medium supplemented with 1 μM KIN. The average of 3.8 leaves per explant obtained on media treated with 3 μM BAP. Result showed that medium supplemented with 2 μM KIN promote the highest growth with an average of 2.72 cm shoot length and 1.6 cm root length after 3 weeks. In addition, medium added with 2 μM BAP and supplemented with 3-4% (w/v) of sucrose promote the best growth i.e., 8.6 mm leaf length. In conclusion, present results showed that it is possible to improve the production of Zinnia elegans plants in vitro with using different cytokinins and carbon sources.
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