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Leila Yari, Shahla Hashemi, Farshid Hasani,
Volume 1, Issue 1 ((Spring and Summer) 2014)

The cultivation of sunflower (Helianthus annuus L.) has significantly increased in recent years, mainly due to the quality of its oil, which is useful for the human consumption and industrial purposes. In order to investigate the effect of different seed storage temperatures on seed quality of two sunflower cultivars (Euorfluor and Rcord), seeds were exposed to three storage temperatures (5, 20 and 20-30C°) for four months. Experimental units were arranged factorial manner in a completely randomized design with four replications. The effect of storage under 20C° was more effective in maintaining the vigor of sunflower seeds. The effect of storage at 5C° culminated in damage of vigor of sunflower seeds by increasing electrical conductivity (EC) and mean germination time. The effect of storage at 20-30C° (alternative temperature) brought about seedling growth by comparing with other treatments. This study indicated that best results for germination and vigor of sunflower seeds found for the seed of Euorflour cultivar in comparison with to Record cultivar under seeds storage temperature.

Mohammad Sedghi, Farzaneh Hasani, Raouf Seyed Sharifi,
Volume 1, Issue 2 ((Autumn & Winter) 2015)

Application of zinc can improve the tolerance and resistance of plants especially sunflower to environmental stresses and be effective on kernel set and yield. To investigate the effects of zinc oxide nanoparticles on the length, effective period, the rate of kernel filling and kernel weight in sunflower cultivars, a factorial experiment based on randomized complete block design with three replications was conducted at the University of Mohaghegh Ardabili, Ardabil, Iran. Treatments were three sunflower cultivars as Aline 191, Aline 122 and Farrokh and three concentrations of nano zinc oxide including 0, 0.5 and 1 g lit-1 which sprayed at three stages. Results showed that interaction of cultivar and nano zinc oxide was significant on kernel filling rate, the effective period of kernel filling, maximum kernel weight and duration of kernel filling. The rate of filling and maximum kernel weight increased with 0.5 g lit-1 spraying of Nano zinc oxide in Aline 191 and 122, but in Farrokh cultivar was significantly reduced in comparison to the control. Also, no significant difference was found between 0, 0.5 and 1 g lit-1 of nano zinc oxide on kernel filling rate, effective kernel-filling period and duration in Farrokh cultivar. In conclusion, foliar application of zinc oxide nanoparticles led to the improvement of kernel weight and their filling parameters and the more appropriate response was observed in foreign cultivars for this treatment, while final kernel weight decreased in Farrokh cultivar. Therefore, it can be used 0.5 g lit-1 of nano zinc oxide for increasing grain yield in foreign cultivars of Aline.

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