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Articles by K. Shahbazi
Total Records ( 2 ) for K. Shahbazi
  K. Shahbazi , A. Tobeh , A. Ebadi , B. Dehdar , A. Mahrooz , Sh. Jamaati-e-Somarin and M. Shiri-e-Janagrad
  To study Nitrogen (N) agronomic use efficiency and nitrate accumulation in potato (Solanum tuberosum L.) tubers as affected by cultivar and N fertilizer level, an experiment was carried out in Ardabil Agriculture Research Station, Iran in 2008. It was based on a completely Randomized Block Design with four replications. The factors included N fertilizer with four levels (0, 80, 160 and 240 kg pure N ha-1) and three cultivars (Satina (V1), Draga (V2) and Agria (V3)). Results showed that with the increase in N level up to 160 kg ha-1, fresh tuber yield significantly increased in cv. Agria. At final harvest, late-maturity cultivar had the highest fresh tuber yield (51.75 t ha-1) under the N level of 160 kg ha-1. With further increase in N level up to 240 kg ha-1, fresh tuber yield and tuber number of late-maturity cv. Agria started to fall. Cv. Agria had the highest N agronomic use efficiency with applying 160 kg N ha-1 and cv. Draga (mid-maturity) had the lowest one with applying 240 kg N ha-1. With the increase in N level, nitrate content of tuber fresh matter and dry matter significantly increased. Cv. Agria, which produced the highest tuber yield, had the lowest nitrate content. Early-maturity cultivars (e.g., Satina) were more prone to accumulate nitrate than late-maturity ones (e.g., Agria). With the increase in N over the optimum level, in addition to yield drop, nitrate content excessively increased. Therefore, fertilizer level of 160 kg N ha-1 was the best level for cv. Agria to produce a high level, but Satina and Draga did not show statistically significant difference in their yields under different fertilizer levels. In group 2, however, under all N levels, Satina had significantly higher tuber yield than Draga. This study proposes fertilizer level of 160 kg N ha-1 as the most optimum fertilizer level for cv. Agria to realize a high yield while Satina and Draga did not show statistically significant difference in their yields at different fertilizer levels.
  M. Shiri-e-Janagrad , A. Tobeh , S. Hokmalipour , Sh. Jamaati-e-Somarin , A. Abbasi and K. Shahbazi
  A field experiment comparing different drip irrigation regimes and plant arrangements on potato yield and its component, leaf, stem and total dry matters, harvest index and water-use efficiency was carried out in a clay soil. This study was carried out on the experimental Farm of Ardebil Agriculture Research Station in 2006. The experiment included three treatments for different drip irrigation regimes: I1 (full irrigation), I2 (80% of full irrigation), I3 (60% of full irrigation) and three treatments for plant arrangements: conventional cultivation (P1), two rows 35 (P2) and 45 (P3) cm apart on a wide bed 150 cm. Results indicate that both drip irrigation regimes and plant arrangements didn’t influence the harvest index. In all varieties, I1, I2 and I3 produced the lowest amounts, respectively. Plant arrangement hadn’t significant impress on tuber yield, numbers and average weight of tubers. P3 and P2 treatments produced maximum and minimum values in more characteristics. The yield of tuber, leaf, stem, total and harvest index indicated increasing trend during the harvest times and only the stem and leaf yield decreased at the two final harvests. In most variables interaction effect of the (I1xP3) generated. Accumulative amounts of reference and 100, 80 and 60% crop evapo-transpiration (EP) were 782.2, 627.6, 502.0 and 376.5, respectively. Water Use Efficiency (WUE) with increase water supply improved. Treatment of I1xP3 had the highest WUE. Its values during growth period increased and maximum WUE obtained at 109 Day after Planting (DAP).
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