الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 116 |  |  |
| | | from | 116 | | |
Abstract
To study the effects of foliar spray with selenium (10ppm), SiO2 (2000ppm), salicylic acid (30ppm), Gebrillic acid (50ppm), benzoyl adenine (5ppm), cycocel (50ppm) and garlic extract (2000ppm) compared with control (tab water) on Jerusalem artichoke (Helianthus tuberosus L.) on growth, tuber yield and tuber quality on the open field and during the cold storage conditions at 5 OC and 90%±5 RH. A field experiment designed in randomized complete block design (RCBD) with three replicates was conducted out at the experimental farm of Environmental Studies and Research Institute, University of Sadat City during 2018 and 2019 seasons. The results of the field experiment revealed that, all tested treatments had a positive effect on growth, tuber yield and tuber quality compared to control in both seasons. Jerusalem artichoke plants sprayed with selenium (10ppm) gave the highest number of main and lateral stems in both seasons, stem diameter in 2018 and leaf contents of phosphorus and potassium as well as plant height in 2019. Application of cycocel at 50ppm showed the highest leaf contents of nitrogen in both seasons, leaf contents of phosphorus and potassium in 2018 and stem diameters in 2019. As for tuber yield and quality, the results showed that Jerusalem artichoke plants sprayed 10 ppm of selenium gave the highest tuber weight, tuber contents of sugar and inulin in both seasons and tuber length in the second season. The application of 50 ppm of gebbrillic acid resulted in the highest tuber yield/plant in both seasons, number of tuber/plant in the first season and tuber diameter in the second season. As for storage experiment the results indicated that tuber weight loss %, tuber decay%, tuber infection with Rhizoctonia, and Microphomina gradually increased with the extended cold storage period up to 21 days in addition to at shelf. All pre-harvest applications showed significant delayed physical and chemical changes in the cold storage and room conditions. Garlic extract seemed to be excellent treatment to extend tuber shelf life where it showed the lowest tuber weight loss, tuber decay and tuber infections with Rhizoctonia and Microphomina under cold storage and shelf. In the same line, selenium application showed the highest tuber contents of total sugars and inulin in both cold storage and room conditions across the two seasons of this study.
Key words: Jerusalem artichoke, selenium, silicon, salicylic acid, growth regulators.