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Articles by G. Fathi
Total Records ( 4 ) for G. Fathi
  M.R. Moradi-Telavat , S.A. Siadat , H. Nadian and G. Fathi
  In order to study the effects of nitrogen and boron on canola yield and its components, in Ahwaz region, an experiment was conducted in 2005-2006 at Ramin Agriculture and Natural Resources University. The experimental design was a randomized completely block with three N rates (150, 200 and 250 kg ha-1) and four B rates (0, 2.5, 5 and 10 kg ha-1). All treatments replicated four times. Results showed that with increase of nitrogen rates, the number of siliques m-2, number of seeds per silique, 1000 grain weight, seed yield, oil yield and biological yield significantly increased but Harvest Index (HI) and grain oil percentage decreased. With increase of boron rates, number of seeds per silique, grain yield, oil yield and harvest index significantly increased, but no significant effect of boron rates on the number of siliques m-2, 1000 grain weight, biological yield and grain oil percentage was observed. The highest grain and oil yield (3095 and 1345 kg ha-1, respectively) were obtained with 250 and 10 kg ha-1 N and B, respectively. Although, the interaction effect of nitrogen and boron on economical yield was not significant, 200 kg N ha-1 and 10 kg B ha-1 had equal grain and oil yield (2803 and 1265 kg ha-1, respectively) to 250 kg N ha-1 and without B application (2640 and 1143 kg ha-1, seed and oil yield, respectively). This experiment showed that B application for canola can result in less use of nitrogen fertilizers. Therefore, B application in this experiment condition is very important agronomic factor.
  A. Koochekzadeh , G. Fathi , M.H. Gharineh , S.A. Siadat , S. Jafari and Kh. Alami-Saeid
  Effect of nitrogen (N) rate and its split application (AP) on qualitative and quantitative characteristics of sugarcane (Saccharum officinarum L.) cultivar CP48-103 was investigated on a loamy soil texture from 2006 to 2008 in the Sugarcane Research Center of the Khuzestan Province, Iran. The experiment was arranged in split plot randomized complete block design with three replications consisted of three different rates of N (N1 = 92, N2 = 138, N3 = 184 kg N ha-1) as main plots and three different AP (AP1 = 20-40-40%, AP2 = 30-35-35%, AP3 = 30-30-40%) as subplots. Twenty canes were randomly harvested from each plot and their quantitative and qualitative characteristics were determined. The results showed that both rate and split application of N fertilizer had no significant effect on sugarcane characteristics. The interactive effects of N application rate and AP on juice purity depicted applying 92 kg N ha-1 and AP of 30-30-40% gave the purest juice with 90%. The Nitrogen Use Efficiency (NUE) was significantly greater for N1 with values of 1.39 and 0.13 t kg-1 N in Cane Yield (CY) and Sugar Yield (SY), respectively. The results showed that the highest cane and sugar yield was obtained with 92 kg N ha-1 and AP of 30-35-35%.
  G. Fathi
  Genotypic differences in responses to nitrogen (N) fertilizer of 6 cultivar of wheat (Atrak, Falat, Fong, Star, Showa, Atila) grown at 6 different rates of N (0, 50, 00, 50, 200 and 250 kg N ha-1) were examined. Measurements of vegetative growth, N content, grain yield (GY), grain protein concentration (GPC) and yield components were taken to identify traits that may contribute to high yield responsiveness. The optimum rates of N for dry matter production at ear emergance (DMee) were greater than 80 kg N ha-1 for all cultivar and often growth increased up to 105 kg N ha-1. Optimum rates of N for grain yield (Nopt) were lower and ranged, on average, from 50 kg N ha-1 for Clipper to 96 kg N ha-1 for Showa. The initial response to N varied from 13-14 kg kg-1 N in Showa, Fong and Star, to 36 kg kg-1 N in Atila. The Nopt for Atila was 71 kg N ha-1 and it tended to show the greatest yield response to N. It produced 19 kernels/g DMee, compared with 15-17 kernels/g DMee in the other cultivars. Unlike most other cultivars, Atila`s yield was consistently and positively correlated with ears m2, Falat was the only cultivar to show a similar relationship. However, the average kernel weight of Atlia was up to 5 mg lower than that of Atrak, Fong and Star and varied more than these cultivars between sites, suggesting that consistent grain size may be a problem in this cultivar. Atrak and Star had lower Nopt (51 kg ha-1) and a less variable kernel weight. There were no signs of differences in GPC of the 6 cultivars used at 3 N-responsive sites. Adding N increased GPC up to the highest rate of N and the responses were generally linear. Average N rates of between 38 kg N ha-1 (Star) and 58 kg N ha-1 (Atila) were sufficient to raise GPC above 11.8%. The experiments showed that the N rates for optimum yields varied considerably among cultivars, but applying rates to achieve maximum yields may cause GPC to exceed the maximum value.
  A. Danesh-Shahraki , H. Nadian , A. Bakhshandeh , G. Fathi , K. Alamisaied and M. Gharineh
  In order to optimization of irrigation and nitrogen management for rapeseed (Brassica napus L. cv. Hyola 401) production at terminal drought stress, an experiment was conducted in a split plot at base of RCB design with four replications in experimental field of Agricultural and Natural Resource University of Ramin during 2005-2007. Irrigation management at three levels: without stress, moderate and severe water stress established as main plots and four N fertilizer rates: 90, 140, 190 and 240 kg N ha-1 were consider as sub plots. The results showed that rapeseed oil and grain yield was affected by terminal drought stress severely. Moderate and severe drought stress reduced grain yield by 14.5 and 32% compared to no stress condition, respectively. With increasing of N rate the number of branches, pod m-2 and 1000-seed weight and consequently seed yield was increased significantly. Seed oil content adverse to seed protein content with increasing the severity of drought stress was decreased. Increase in nitrogen led to increase in protein content, but oil content was decreased. Highest seed and oil yield (3996.3 and 1803.9 kg ha-1, respectively) with 190 kg N ha-1 at no stress condition was obtained. According to these results for maximize production of rapeseed in this region and probably in similar conditions full irrigation and application of 190 kg N ha-1 (with respect to soil analyze) was recommended.
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