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Articles by G.A. Ranjbar
Total Records ( 7 ) for G.A. Ranjbar
  G.A. Ranjbar
  In order to compare forage and hay yield performance of 10 berseem clover genotypes a complete randomized block design with four replications has been undertaken in 2003 and 2004. Samples of 500 g per plot were selected for measuring of dry weight and dry matter percentages of each cultivar. Fresh forage yield of cultivars were significantly different and cultivar Sacromonte by producing 30.80 t ha-1 in average has been ranked as the first high yielding cultivar position, so that, control cultivar, Karmel, showed as a low yielding cultivar in fresh yield production. With regard to dry weight production, there also were significantly differences among different genotypes. Genotype Sacromonte with 5.07 t ha-1 produced the highest dry weight mainly because of higher fresh yield production; however, results obtained from ratios of dry matter brought position of cultivar Sacromonte from first in fresh and dry weight to fifth in percentage of dry matter. Laura with 20.7% has produced highest percentage of dry matter.
  G.A. Ranjbar and M.A. Bahmaniar
  In order to investigate role of zinc application (soil + foliar application) on growth traits, yield, its concentration and accumulation in wheat leaves and grains, two common cultivars of wheat namely Tajan and Nye 60 have been selected. Four zinc fertilizer levels including Zn0 (no zinc fertilizer), Zn1 (5 kg Zn ha-1 in soil + 300 g Zn ha-1 in foliar application), Zn2 (10 kg Zn ha-1 in soil + 600 g Zn ha-1 in foliar application) and Zn3 (15 kg ha-1 in soil + 900 g Zn ha-1 in foliar application) both from zinc sulfate source have been applied in planting and booting stage in soil and as foliar application. A pot experiment was conducted as a factorial design with 3 replications during 2005. Results showed that using zinc caused increasing effects on grain yield, total dry matter, yield, 1000 grain weight, number of tiller, grain zinc content, flag leaf zinc content, plant height, number of node, protein content and grain Fe content. Number of tiller, grain zinc content and percentage of protein were higher in Tajan cultivar than Nye 60. In other hands, Nye 60 had higher grain yield and 1000 grain weight than Tajan, however, other measured traits showed no significant difference.
  Kiani Sh , G.A. Ranjbar , S.K. Kazemitabar , S.K. Kazemitabar , N. B. Jelodar , M. Nowrozi and N. Bagheri
  Gelatinization Temperature (GT) and Gel Consistency (GC) are important traits in determination of rice quality. In present study four rice cultivars namely Sang-e-Tarrom, Gerdeh, IR229 and IRRI2 have been utilized in hybridization as parents. In order to know about genetic characteristics and inheritance of the related traits, direct and reciprocal crosses have been conducted between parents Sang-e-Tarrom and Gerdeh and between IR229 and IRRI2. Inheritance of related traits have been studied in direct and reciprocal hybridizations for hard, intermediate and soft GC, low and high GT. For these evaluations P1, P2, F1, F2, BC1, BC2 generations and their reciprocal crosses have been utilized in present study. Results showed that gene hard GC dominates on intermediate and soft and also intermediate GT dominates on low. From direct and reciprocal crosses Gerdeh x Sang-e-Tarrom and IR229 x IRRI2 have been illustrated that GC and GT expressions are under monogenic control of one major gene corresponding with several modifier genes. Gene dosage effects play a tremendously important and effective role in segregation production among traits. Regarding to the obtained results selections can effectively be performed in later segregation generations for GC and in early generations for GT.
  M.A. Bahmaniar and G.A. Ranjbar
  Nitrogen and potassium are the yield-limiting nutrients in rice production regions of Iran. Use of N and K efficient cultivars is an important complementary strategy in improving rice yield, increasing the quality properties of rice grains and reducing cost of production. In order to consider the effects of different amounts of N and K application on rice (Oryza sativa L.) yield and yield components in pot and field conditions these experiments were undertaken in 2004 at Sari Agricultural Station, Iran. Four levels of N (0, 50, 100 and 150 Kg N ha-1 in field and 0, 0.6, 1.2 and 1.8 g N pot-1 in pot) corresponding with four levels of K (0, 75, 150 and 225 kg K2O ha-1 in field and 0, 0.5, 1 and 1.5 g K2O pot-1 in pot) were applied in a split-factorial plot design with three replications in both pot and field experiments, variously. Grain yield, number of grain per panicle, number of tiller, plant height, length of flag leaf, total and shoot dry matter, 1000 grain weight and harvest index have been increased by N application in field conditions. However, in pot conditions grain yield, number of grain per panicle, number of tiller, plant height, width of flag leaf, total and shoot dry matter, leaf nitrogen contents and harvest index have significantly been increased (p≤0.05). Potassium application in field conditions has significantly affected on all characteristics but 1000 grain weight and leaf N and K contents. Simultaneous application of N and K have increasingly affected on grain yield, plant height, shoot dry matter and harvest index in field conditions and on plant height, length of flag leaf and shoot dry matter in pot conditions (p≤0.05).
  M.A. Bahmaniar , G.A. Ranjbar and S.H. Ahmadian
  Nutrition elements like nitrogen and potassium are restricting yield performance of rice cultivars and affecting on their characteristics. In order to consider effects of different amount of nitrogen and potassium on yield and chemical compounds of two rice cultivars (Tarrom and Neda which are landrace and improved Iranian genotypes, respectively), current experiment has been undertaken in 2004 and 2005. Four levels of nitrogen fertilizer (0, 50, 100 and 150 kg N ha-1 from urea source) and four levels of potassium fertilizer (0, 75, 150 and 225 kg K2O ha-1 from potassium sulfate source) have been applied in a split-factorial based on randomized block design with three replications. Nitrogen fertilizer has been applied in three different stages of plant growth ( in transplanting, in tillering and in flowering initial stages) and potassium fertilizer has also been applied in two growth stages (½ in transplanting and ½ in shooting stages). Results indicated that application of nitrogen has increased plant height, number of tiller, length and width of flag leaf, length of panicle, number of grain per panicle, grain yield, amount of dry matter, biological yield, harvest index, leaf potassium, leaf nitrogen, 1000 grain weight and reducing percentage of hallow grain. Also, applied potassium has positive effects on all of above mentioned yield components except harvest index and 1000 grain yield. Neda cultivar was better than Tarrom genotype for most of the measured traits. Interaction of nitrogen and potassium were affected significantly on number of tiller per plant, grain yield, amount of dry matter and biological yield in Neda cultivar and on length of flag leaf, number of grain per panicle, grain yield, amount of dry matter, biological yield, harvest index and 1000 grain yield in Tarrom genotype.
  G.A. Ranjbar
  Aim of this study was to determine planting date effects on Nodal distribution of yield and its components in nine indeterminate soybean cultivars. To meet such a purpose, a split plot design based on a randomized complete block layout with six planting dates (24th April, 10th and 27th May, 10th and 26th June and 11th July) as main plots and nine cultivars (Williams, Clark 63, SRF 450, Steele, Hark, Corsoy, Blackhawk, Woodworth and Bonus) as sub plots have been used in five replications. The results have clarified that height, branch number, pod number, grain number and seed weight plays an important role on yield increasing. So that, medium maturity cultivars have producing maximum number of pods, grains and seed weight in their upper two third of canopy. Also, various cultivars have indicated different reactions for yield components, so that, Williams and Woodworth (medium maturity cultivars), Steele and Bonus (early maturity cultivars) have produced larger seeds in different planting dates. Generally, Woodworth, in comparison with the other cultivars, demonstrating superiorities in all the considered traits. Maximum amount of pod number, grain number and seed weight in early maturity cultivars was belong to 27th of May planting date, however, for Woodworth and Clark 63 (medium maturity) it was 24th of April and 27th of May, respectively. The highest 100 seed weight per node were produced at 26th of June and 27th of May planting dates by Woodworth and Corsoy, respectively. Differences between planting dates for 100 seed weight in Clark 63 and Bonus were not significant.
  M.A. Bahmaniar and G.A. Ranjbar
  In order to consider effects of various levels of nitrogen and potassium application on cooking quality traits of rice cultivars, an experiment was conducted in 2004 and 2005 using Tarrom (a local Iranian landrace) and Neda (an Iranian improved cultivar). In this experiment four levels of nitrogen fertilizer (0, 50, 100 and 150 kg N ha-1 from urea source) and four levels of potassium fertilizer (0, 75, 150 and 225 kg K2O ha-1 from potassium sulfate source) have been applied using a split factorial design with three replications. Nitrogen fertilizer have been applied in three stages (1/3 in transplanting stage, 1/3 in tillering stage and finally 1/3 in flowering initiation stage) and potassium fertilizer have been applied in two stages (½ in transplanting stage and ½ in shooting stage). Results showed that application of nitrogen increased gel consistency and decreased amylose content of rice kernel; however, had not significantly affected gelatinization temperature and grain protein content. Application of potassium increased gel consistency and grain protein content but had not significantly affected gelatinization temperature and kernel amylose content. Gel consistency and gelatinization temperature of Tarrom were higher than Neda; whilst, inversely, grain amylose and protein contents of Neda were higher than Tarrom. Simultaneous application of nitrogen and potassium has no significant effects on gel consistency, gelatinization temperature and grain protein content; But maximum amylose content was achieved using none of fertilizers in Neda and 75 kg K2O ha-1 with no nitrogen fertilizer in Tarrom genotypes, respectively.
 
 
 
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