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Articles by H. Pirdashti
Total Records ( 7 ) for H. Pirdashti
  S. Ghorbani , B.N. Khiabani , I. Amini , M.R. Ardakani , H. Pirdashti and S.R. Moakhar
  In order to study the influence of iron and zinc elements on yield and yield components of wheat mutant lines during 2006-2007, an experiment was conducted in form of factorial based on complete randomized block design with four replications. Factors include genotype (Tabasi, T-65-7-1, T-65-5-1, T-66-67-60, T-65-58-8) and fertilizer [N, N+Fe, N+Zn, N+Fe+Zn]. Results showed that genotype had high significant effect on GY, by, HI, grain number per spike and spike number per square meter. Iron and zinc fertilizers had significant effect on grain yield and harvest index. Biological yield was not significantly different by imposing of mentioned fertilizer applications. Seed number in spike correlated with seed weight in per spike. Spike number in plant had correlation with spike number in m2, straw yield and hectoliter seed weight. Seed weight in per spike had relationship with grain yield, harvest index and thousand seed weight.
  D. Barari Tari , H. Pirdashti , M. Nasiri , A. Gazanchian and S.S. Hoseini
  In order to study the effects of transplanting date, planting spaces and nitrogen fertilization on morphological characteristics of rice promising line a field experiment was carried out in the Rice Research Institute of Iran (Amol). Experimental design was arranged in a split plot factorial in basis of completely randomized block design with three replications. Some agronomical traits such as panicle length, grain number per panicle, filled grains percentage, 1000 grains weight, fertile tiller numbers, flag leaf area, flag leaf angle, grain yield and harvest index were measured. Results showed that the effect of transplanting date on grain number per panicle was significant at 0.01 probability level. Also the effect of planting spaces on grain number per panicle and fertile tiller was significant at 0.05 and 0.01 probability level, respectively. Nitrogen fertilizer levels had significant effect on, flag leaf area, flag leaf angle, panicle length, 1000 grains weight and grain yield. According to results, 1000 grains weight, harvest index and filled grains percentage had the most correlation with grain yield, respectively. For this line, transplanting date at May 12, planting space at 20x20 cm and 115 kg N ha-1 for the best performance of yield attributes were recommended.
  Esmaeil Yasari , A.M. Esmaeili Azadgoleh , H. Pirdashti and Saedeh Mozafari
  In order to evaluate the effect of additional application of Azotobacter and Azospirillum inoculants (Biofertilizers) on canola (Brassica napus L.) yield and profitability, a split-plot experimental design with 20 treatments was carried out during 2004-2005 with four replications in the North of Iran. High yielding canola (cv. Hyola 401 hybrid), was grown in rotation after wheat. Two levels of biofertilizers as control and seeds inoculation in main plot and 10 treatments of chemical fertilizers comprising N, P, K and their combinations, NPKS and NPK Zn in sub plots were applied. The treatment T20 resulted in the maximum seed yield (3374 kg ha-1) coinciding with the maximum number of pods per plant (246 pods per plant) followed by the treatments T19, T18 and T15. Out of these 4 treatments, it was discovered that the highest net benefit of adding biofertilizers was observed at T15 (1.07 million rials.ha-1 = 117.7 $.ha-1). The research projects how the efficiency of these biofertilizers was maximum in presence of N and P fertilizers, while in the presence of K and Zn fertilizers at T20 it resulted mainly in the increase of fodder rather than seed. The seed N, protein and the oil percentage remained unaffected by biofertilizers application.
  Y. Nicknejad , R. Zarghami , M. Nasiri , H. Pirdashti , D.B. Tari and H. Fallah
  An experiment was conducted at Iran Rice Research Institute-Deputy of Mazandaran (Amol) in 2007, to study the physiological and morphological indices of different rice varieties. The experiment was carried out with, Factorial experiment in randomized completely block design comprising four replications. Studied factors were limitation of source and sink in 4 treatments viz., (1) cut all of leaves except flag leaf, (2) cut flag leaves, (3) cut 1/3 end of panicle and (4) control. Variety in four treatment was as Tarom, Neda, Shafagh and Fajr. Completion of source and sink limitation treatments were carried out at 50% flowering stage. Results showed that the most CGR was related to Shafagh variety (25.18 g/m2/day) in 1650 GDD and the least CGR was produced in the Tarom variety (21.1 g/m2/day) in 1452 GDD. The most RGR was obtained in the Shafagh and the least RGR was obtained in the Neda variety at the 850 GDD. Completion source and sink limitation treatments on leaf area index showed that cut all leaves except flag leaves had least leaf area index also with cut all of leaves and flag leaves in all of varieties the RGR was decreased. Results of morphological characteristics measurement showed that highest plant height and least plant height were produced in the Tarom and Shafag varieties, respectively. Maximum leaves number in the Tarom variety was produced in the 1180 GDD. Also, the Neda variety with produced 24 tillers per plant had most tiller number. The Tarom variety with coefficient 81.25% had most conversion all tillers to fertile tiller percentage.
  H. Pirdashti , Z. Tahmasebi Sarvestani , GH. Nematzadeh and A. Ismail
  An experiment was conducted to compare fifteen lowland rice (Oryza sativa L.) genotypes for drought tolerance based on some physiological parameters in germination stage. Five levels of water stress (0, -3.0, -5.0, -7.5 and B10 bars) treatments were given with polyethylene glycol (PEG 6000). The water solutions were replaced with fresh solutions regularly. Seed germination percentage and seedling growth decreased with increasing water stress in all the genotypes. Among the genotypes, Tarom, Khazar, Fajr and Nemat recorded better germination and seedling growth in terms of radicle and plumule length under stress conditions than other genotypes.
  S.R. Mostafavian , H. Pirdashti , M.R. Ramzanpour , A.A. Andarkhor and A. Shahsavari
  A field experiment carried out in a calcareous soil with a low available phosphorus to evaluate effectiveness of biofertilizers, mycorrhizae (Glomus intraradices) and Thiobacillus sp. inoculation individually or in combination on seed yield, oil, protein and some elements (P, Fe, Mn, Zn) concentration in two soybean [Glycine max (L.) Merr.] cultivars. The applied treatments were different fertilizers with 6 levels (including: NP (control, 12 kg N ha 1 as urea, 46 kg P2O5 ha 1 as triple super phosphate); NPK (NP + 75 kg K2O ha 1 as potassium sulphate); NPKS [NPK+ S (100 kg S ha 1)]; NPKST (NPKS + seed inoculation with Thiobacillus bacteria); NPKM (NPK + Seed inoculation with mycorrhizae fungi) and NPKSTM (NPKS + seed inoculation with Thiobacillus and mycorrhizae) and two cultivars (JK and 032). Before planting, soybean seeds were inoculated by Bradyrhizobium japonicum in all treatments. Results showed that combined inoculation of biofertilizers increased yield, however the highest yield was observed in treatment NPKST. Increasing oil content (percentage) was more pronounced in treatments NPKM, while most protein content (percentage) increasing was observed in NPKS and NPKM. Fe and Zn concentrations were unaffected significantly by fertilizer treatments, but NPKSTM showed significantly higher value of seed`s Mn concentration compared to treatments NP and NPK. Although no significant difference was observed in terms of P concentration of 032 line among fertilizer treatments, JK cultivar and NPKSTM caused a significant increasing in P concentration compared to NP, NPKS and NPKM. Present results suggested that applying biofertilizers i.e., mycorrhizae and Thiobacillus increased soybean yield compared to control (NP). Overall, this study demonstrated that soybean seed yield and its chemical composition could be affected by biofertilizer inoculation.
  Saghar Rasaei Moakhar , B.Naserian. Khiabani , I. Amini , M.R. Ardakani , H. Pirdashti and S. Ghorbani
  In order to evaluate the reaction of yield and yield components of wheat’s mutant lines to different levels of nitrogen in the crop year of 2006-2007, an experiment was conducted as factorial based on completely randomized block design in 4 replicates in the Research Farm of Agricultural, Medical and Industrial Research School in Zaferaniyeh-Karaj-Iran the first factor included 5 genotypes of wheat (Tabasi-the maternal entity, T-65-7-1, T-65-5-1, T-6-67-60, T-65-58-8) and the second factor consisted of 4 levels of nitrogen (100, 140, 180 and 220 kg ha-1 urea 46%). The result showed that grain’s yield harvest index, number of grain/spike in mutant lines and their parent had significant difference (p<0.01) in mutant genotypes, meanwhile, the biological yield and the number of spike m-2 were not significant difference (p<0.05). The harvest index, number of grains per spike, grain’s yield, biologic yield and number of spikes m-2, weight of 1000 grains didn’t affected by applying different levels of nitrogen fertilizer.
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