A field experiment was conducted in Autumn planting season 2018 at the Fields of In section 158 of the district 41 Husseiniya Province of Babylon, to investigate the influence of foliar application of Nano chelate silicon fertilizes (NSF), Nano chelated potato specific fertilizer (NPS) and Nano chelated complete micro(NCM) on growth and yield of potato variety Riviera. Foliar applied at 50, 100, 150 and 200 g or ml of all nanofertilizer types 100 L−1 water or 2 kg nanofertilizers ha−1 (as recommended) dissolved in 400 liters of water ha−1.The experiment included spray of single (NSF), (NPS), (NCM), di (NS+NPS),(NS+NCM),(NPS+NCM), and tri combinations (NS+NPS+ NCM), in addition to control (only water) using RCBD with 3 replicates. Growth and yield parameters tested were chlorophyll, dry matter, vegetative yield, fresh tubers yield, biological yield, starch, crude protein, ascorbic acid, AE(Agronomic efficiency) and WUE (Water use efficiency). The results showed that tri combination (NS+NPS+NCM) spray treatment was significantly higher followed by the di and single spray combinations. Fresh yield, dry tubers, vegetative yield and biological yield were (42.130, 9.327, 2.901 and 12.228 Mg ha−1) respectively, compared with the control (28.440, 5.453, 2.240, and 7.693 Mg ha−1), respectively. Tri combinations (NS+NPS+ NCM) starch content, crude protein and ascorbic acid concentration (vitamin c) were (17.10 %, 9.08% and 185.33 mg kg−1 f.w.), compared with the control treatment (12.22%, 7.79% and 136.33mg kg−1 f.w.).

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.