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Articles by A. Mahrooz
Total Records ( 1 ) for A. Mahrooz
  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.
 
 
 
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