Abstract
Assessments of growth, calyx yield and nutritional composition of roselle can help farmers in Iraq to determine which cultivars are the best for commercialization. The field experiment has been done on two roselle cultivars (red and white) during summer of 2019 in a private farm that belongs to a farmer in Al-Saniyah county, Al-Diwaniyah, Al-Qadisiyah province, Iraq, to investigate the impact of applying various rates of N fertilizer (0, 30, 60, 90, and 120 kg N/ha) on some agronomic traits and calyx yield. The results exhibited that there were significant differences in the rate of Nitorgen and applying N fertilizer has increased the vegetative growth and yield. Significant differences have been also reported in different agronomic traits between the cultivars and the white cultivar showed the best. The red cultivar of roselle showed the better in yield and yield components than the white cultivar grown in Iraq. it can be concluded that applying of nitrogen fertilizer had a pronounced beneficial influenced on the red roselle cultivar.
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