Influence Of Nitrogen Rates And Foliar Spray By Different Concentration Of Copper On Sesame Seed And Oil Yields As Well As Nitrogen Use Efficiency In Sandy Soil

摘要

A field experiment by the randomized complete block design in split –plot arrangement with threereplications was conducted in 2009 and 2010 seasons at the experimental farm, Agriculture Faculty, SebhaUniversity, Libya to evaluate the effects of nitrogen and copper application on sesame seed and oil yields aswell as nitrogen use efficiency under sandy soil conditions. The obtained results show significant effects ofnitrogen, copper and their interaction in all studied traits in the two growing seasons. The highest values of allstudied traits except seed oil content were obtained when sesame plants fertilized with 150 kg N ha-1. On theother hand, the maximum seed oil content values were registered from low nitrogen fertilization treatment (90kg N ha-1). Foliar spray by copper nutrients enhancement significantly sesame yield and yield attributes as wellas nitrogen use efficiency in both seasons in favor of high copper concentration (150 ppm). The maximum seedand oil yields ( 1100 and 510 kg ha-1 for seed and oil yields, respectively in first season being 1080 and 515 kgha-1 in second season in the same order) were obtained when sesame plants were fertilized by150 kg N ha-1 with150 ppm copper as foliar spray. But, the application of 90 kg N ha-1 With 150 ppm copper nutrient as foliarregistered the highest mean values of nitrogen use efficiency (10.1 and 9.8 in 2009 and 2010 seasons,respectively).