Influence of Nitrogen Fertilizer on Growth and Calyx Yield of Roselle (Hibiscus sabdariffa L.) Grown under Field Conditions

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.

Effect of Applying Different Levels of Nitrogen Fertilizer on Growth and Essential Oil of Chamomile (Matricaria chamomilla L.)

“…Additionally, nitrogen is also enhanced root growth by increasing root length and root weight, which leaded to increase the water and nutrient uptake in the chamomile plants [8,29]. In accordance with current study, the influence of nitrogen fertilizer on plant growth improvement has been observed in several medicinal species such as [22] and [14].…”

“…Moreover, this field study found that nitrogen deficiency affects the development of medicinal and aromatic plants and the production of essential oils [21]. It is proved by studies, the nitrogen source and application rates are essential factors that could manipulate the growth and production of essential oils in medicinal and aromatic herbs [12,14,22]. [23], the availability of studies that reviewed the influence of nitrogen application on chamomile growth and essential oil quality was limited, but we could summarize the main results.…”