Nasrin Farhadi; Mohammad Kazem Souri; A. Alirezalu; H. Rabbi Angoorani
Abstract
Castor oil due to extraordinary physicochemical properties has numerous applications in pharmaceutical, chemical, hygienic, biodiesel and nowadays in food industries. During plant growth and development, as well as during postharvest and processing, different factors may affect caster oil properties. ...
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Castor oil due to extraordinary physicochemical properties has numerous applications in pharmaceutical, chemical, hygienic, biodiesel and nowadays in food industries. During plant growth and development, as well as during postharvest and processing, different factors may affect caster oil properties. This study was conducted to evaluate oil content and physiochemical properties under different sowing dates under climatic conditions of Tehran. The highest seed yield (1590.67 kg ha-1) and oil yield (774.43 kg ha-1) were obtained from 5th April Sowing date, that had significant difference with other sowing dates. In analyzed samples oil content were (%34.45-49/97), moisture content (%0.97-2.12), refractive index (1.470-1.473), chlorophyll content (0.26-0.40 mg Pheophytin/kg oil), acid value (0.28-0.62mg NaOH/g oil), peroxide value (0 meq O2/kg oil), soponification value (165.62-181.34 mg KOH/g oil) and iodine value (82.43-89.22 g I2/100 g oil). The results revealed significant differences for moisture and chlorophyll content, acid value (p
Najmeh Hadi; Mohammad Kazem Souri; R. Omidbeigi
Abstract
Abstract
Angelica archangelica, Tanacetum cinerariaefolium and Chelidonium majus are valuable medicinal plants for which there is no comprehensive information about their seed germination in review of literatures. With regarding of the importance of simple propagation of medicinal plants and the role ...
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Abstract
Angelica archangelica, Tanacetum cinerariaefolium and Chelidonium majus are valuable medicinal plants for which there is no comprehensive information about their seed germination in review of literatures. With regarding of the importance of simple propagation of medicinal plants and the role of seed in production of these plants, this study was set out in order to analyzing of the effects of cold stratification (control, 2, 3 and 4 weeks) and acid gibberellic (control, 100, 150, 250, 350, 450, 500 and 1000 ppm) treatments on seed germination of these species. Treatments were arranged seperately in a Completely Randomized Design with 3 replicates. The results showed that the highest mean germination (percentage and rate) was observed in 3 and 4 weeks (40%) and 4 weeks (1.8 seeds per day) cold stratification for Angelica archangelica seeds, 3 weeks (42.67%) and 4 weeks (6.17 seeds per day) cold stratification for Tanacetum cinerariaefolium seeds, and 100 and 350 ppm (100%) and 500 ppm (5.22 seeds per day) GA3 solutions for Chelidonium majus seeds.
Keywords: Germination, Cold stratification, Gibberellic acid, Angelica archangelica, Tanacetum cinerariaefolium, Chelidonium majus
abdoreza sajjadinia; Hamid Reza Roosta; Mohammad Kazem Souri; A. Rahimi
Abstract
Abstract
In this study different proportions of NH4+ and NO3- in the growth medium on plant growth were investigated in hydroponic greenhouse experiments. The objectives of these studies were to investigate if ammonium (NH4+) stress in cucumber, a species sensitive to NH4+ toxicity, can be alleviated ...
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Abstract
In this study different proportions of NH4+ and NO3- in the growth medium on plant growth were investigated in hydroponic greenhouse experiments. The objectives of these studies were to investigate if ammonium (NH4+) stress in cucumber, a species sensitive to NH4+ toxicity, can be alleviated by matching the nitrogen supply rate to the plant nitrogen demand. Ammonium was applied at a relative addition rate of R=0.15 day-1 or R=0.25 day-1. For comparison, plants were also grown with NO3- as N source, as well as at constant concentrations of 1 and 4 mM NH4+. The fresh weight of plants grown with NH4+ as sole N source at R=0.15 day-1 was similar to that of NO3--fed plants, while at the high NH4+ supply rate of 0.25 day-1 a small growth reduction occurred. When available as a constant concentration, NH4+ decreased plant growth at 4 mM. Root:shoot ratio was lower in NH4+-fed plants compared to NO3--fed plants, and the NH4+-fed plants had more branched roots. Calcium concentration decreased in the roots, stems and leaves of NH4+-fed plants compared to NO3--fed plants. There were no differences in leaf chlorophyll fluorescence at the various N treatments. It is concluded that even a putative NH4+ sensitive species such as cucumber can tolerate NH4+ if the supply rate matches the N demand of the plants.
Keywords: Nitrogen, Ammonium toxicity, Nnitrate, Relative addition rate, Hydroponics, Cucumber
