Safaa Fahed Najla* (1), Ramzi Fahed Murshid
(1)- Horticulture Science Department – Faculty of Agriculture- Damascus University
(*Corrsponding author: Safaa Najla. E-Mail: safaanajla@gmail.com).
Received: 28/01/2020 Accepted: 23/02/2019
Abstract
The study was carried out during 2017 season in Abu Jarash farm in Damascus city, in order to compare the effect of 3 nitrogen fertilizer concentrations M (100, 75 and 50% of the recommended dose) and 3 concentrations of Glycyrrhiza glabra extract T (5, 10 and 15 g/l) in addition to the interaction treatments, on morphological (leaf number, plant leaf area, stem length and diameter…etc) and biochemical characteristics (chlorophyll a and b, total oxalate, vitamin C and N, P, K, Ca and Mg contents) of spinach. The experiment was designed according to complete random blocks, and it consisted of 10 treatments (M100, M75T5, M75T10, M75T15, M50T5, M50T10, M50T15, T5, T10 and T15). Each treatment includes 5 repetitions. The results showed a significant effect for M50T15 with leaf number (17.86 leaf/ plant), for M50T10 and M50T15 with leaf area, and for M50T15, M75T15 and M50T10 with stem diameter. M100 treatment increased significantly the total oxalate (370.45 mg/ 100g fw) and N content (38.12 g/ kg dw), while T5, T10 and T15 increased significantly vitamin C (38.99, 40.12 and 39.96 mg/100g fw). The nitrogen fertilization reduced significantly P content as compared to the foliar spray extract treatments. No significant differences were observed for K content while Ca and Mg contents increased as nitrogen fertilization was decreased. In conclusion, using the half dose of nitrogen fertilization beside the foliar spray by 10 gL of Glycyrrhiza glabra extract, could achieved an optimal result for spinach.
Keyword: Spinach, Glycyrrhiza glabra extract, Nitrogen fertilization, Morphological characteristics, Biochemical characteristics.
Full paper in Arabic: PDF