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Articles by S.A. Siadat
Total Records ( 3 ) for S.A. Siadat
  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%.
  S. Shokri , S.A. Siadat , Gh. Fathi , B. Maadi , A. Gilani and A.R. Abdali Mashhadi
  The aim of this study was to evaluate the effects of nitrogen fertilizer rates on dry matter remobilization among three rice cultivars. A field study was carried out at Ramin Agricultural and Natural Resources University. In 2007, a split plot experiment in the basis of randomized complete block design with three replications was used. Four nitrogen fertilizer rates (0, 100, 135 and 170 kg ha-1 from urea source) as the main plots and three rice cultivars (Champa, Anburi and LD183) as the sub plots were used. Results showed that nitrogen fertilizer rates had significant effect on dry matter remobilization amount in total shoot, stem and leaves in which among cultivars, LD183 had the highest amounts in terms of stem and total shoot dry matter remobilization. This amount was obtained at 0 kg ha-1 nitrogen fertilizer treatment. The highest rate of dry matter remobilization in leaves (except flag leaf) related to LD183 that obtained in 170 kg ha-1 nitrogen fertilizer level. Also, flag leaf of LD183 had the highest dry matter remobilization amount, although was not affected by nitrogen fertilizer rate. Thus, it seems that this part has important role in current photosynthesis at post anthesis stage compared with dry matter remobilization. According to our findings, flag leaf in Champa not only has no significant role in dry matter remobilization, but also act as a powerful sink for photosynthetic assimilates.
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