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Efficiency of a closed hydroponic system and nano-silica treatment in resource-use, quality and production of samurai roses
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Parvan Aghdak   , Rahim Barzegar * , Ali Nikbakht , Hossein Shariatmadari , Sadegh Mousavi-fard , Alireza Alipour |
| Department of Horticultural Sciences, Faculty of Agriculture, Shahrekord University |
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Abstract: (55 Views) |
Closed hydroponic systems are expanding because of increased water and fertilizer use efficiency. Due to Iran's lack of water resources, investigating the possibility of using these systems is one of the research priorities. To investigate the effect of different refill nutrient solution concentrations and nano silica foliar applications on the yield, quality, resource use efficiency of cut roses Samurai, a factorial experiment using a completely randomized design with 4 levels of refill nutrient solution concentrations (control or using a full strength nutrient solution in open system, three quarters, one second and one quarter) and two levels of nano silica (zero and 2 mg/L) were carried out. In recirculation treatments, the drained solution was collected under the beds related to each treatment and returned to the main tank; then, to compensate for the decrease in the volume of water and nutrients used, refill nutrient solutions with three-quarter, one-half and one-fourth concentrations were used. Four months after the start of recirculating, 12 times foliar application with nano silica was done at intervals of one week. The highest bud length, stem length and diameter, leaf number and area, and stem fresh weight were related to the treatment combinations of control and three-fourth refill nutrient solution with nano silica. The amount of total chlorophyll was the highest in the control without nano silica. The control with nano silica foliar application had the highest amount of carbohydrates. In all concentrations of the refill nutrient solution, nano silica caused an increase in carbohydrates compared to its absence. The highest postharvest longevity and yield were also obtained in the control and three-quarter treatments with nano silica. The highest water use efficiency was related to the three-quarter treatment with nano silica foliar application. The best fertilizer use efficiency was related to the one-quarter treatment with nano silica. The results of this research show that using of the refill nutrient solution with a three-quarter concentration with nano silica foliar application in addition to maintaining the quality of flowers by increasing the water and fertilizer use efficiency, can be a suitable alternative to common open cultivation in greenhouses.
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| Keywords: greenhouse, controlled production, fertilizer, resource saving, cut flowers |
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Type of Study: Research |
Subject:
Special
Received: 2024/07/25 | Accepted: 2025/05/25 | Published: 2026/06/2
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