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De Souza A.,University of Granma | Garcia D.,Agricultural Research Institute Jorge Dimitrov | Sueiro L.,Agricultural Research Institute Jorge Dimitrov | Gilart F.,University of the East of Cuba
Scientia Horticulturae | Year: 2014

The effects of pre-sowing magnetic treatments on germination under laboratory conditions and emergence, growth and yield of onion (cv Red Creole) plants under field conditions were investigated. Onion seeds were exposed to 60Hz full-wave rectified sinusoidal non-uniform magnetic fields (MFs) induced by an electromagnet at 160mT for 15 and 20min. Non-treated seeds were considered as controls. Plants were grown in experimental plots (2.4m2) and were cultivated according to standard agricultural practices. During vegetative stage and bulb forming, samples were collected at regular intervals for growth rate analyses. At physiological maturity, the plants were harvested from each plot and the yield and yield parameters determined. Under laboratory conditions, the magnetically treated seeds showed a higher germination percentage than the control seeds. Significant differences were found between both treatments and the best finding was found for 160mT for 15min. In field experiments, the treatments led to a significant increase in seedling emergence, root length, seedling height, seedling dry weight and leaf area per plant. Also, at the vegetative stage, the leaf and root relative growth rates of plants derived from magnetically treated seeds were greater than those of the control plants. At the bulb forming stage, bulb relative growth rates from magnetically exposed seeds were greater than those of controls. At the bulb maturity stage, all magnetic treatments significantly increased mean bulb weight, bulb yield per area, number of tunics per bulb, bulb diameter and dry bulb weight in comparison to the controls. The results suggest that pre-sowing extremely low-frequency non-uniform MF treatment has the potential to improve crop productivity of onion through the enhancement of germination, seedling emergence, plant growth, bulb formation and yield. © 2014 Elsevier B.V. Source

De Souza A.,Agricultural Research Institute Jorge Dimitrov | Sueiro L.,Agricultural Research Institute Jorge Dimitrov | Garcia D.,Agricultural Research Institute Jorge Dimitrov | Porras E.,Agricultural Research Institute Jorge Dimitrov
Seed Science and Technology | Year: 2010

The influence of pre-sowing magnetic field treatments on tomato (cv. Lignon) seed germination and seedling growth under laboratory conditions and emergence and plant growth parameters under greenhouse conditions were studied. Seeds were exposed to 60 Hz full-wave rectified sinusoidal non-uniform magnetic fields (MFs) induced by an electromagnet at 80, 120, 160 and 200 mT(rms) for 1, 3, 5, 10, 15 and 20 min. Under laboratory conditions, various combinations of magnetic field strength and exposure time significantly improved seed performance in terms of reduction of time required for the first seeds to complete germination, time to reach 50% germination, time between 10 and 90% germination with increasing germination rate, and increased germination percentage at 4 and 7 days, seedling shoot and root length compared to the untreated control seeds. The combinations 160 mT for 1 min and 200 mT for 1 min gave the best results. In soil, exposure of seeds to these two magnetic fields significantly increased emergence index, percent emergence, shoot and shoot length, shoot and root dry weights and leaf area of 28-day-old seedlings under greenhouse conditions compared to control seedlings. Pre-sowing magnetic treatments therefore have the potential to enhance tomato seed germination and early seedling growth. Source

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