Maryam Mansori; Gholam Abbas Akbari; Seyad Mohammad Mahdi Mortazavian
Abstract
To evaluate the effect of foliar application of nano-particles of titanium dioxide on yield and yield components of ecotypes of cumin under drought stress conditions, a split-split plot experiment was carried out based on a randomized complete block design with three replications, during 2014-2015 at ...
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To evaluate the effect of foliar application of nano-particles of titanium dioxide on yield and yield components of ecotypes of cumin under drought stress conditions, a split-split plot experiment was carried out based on a randomized complete block design with three replications, during 2014-2015 at the research farm of Aburaihan Campus, University of Tehran at Pakdasht. Treatments were consisted of water stress at three levels (full irrigation throughout growing season, water stress at vegetative and reproductive stages), spraying of nano-particles of titanium dioxide at three levels (no spray, spraying with concentration of 0.015 and 0.03 percentages) and also ecotypes of cumin from nine regions. Based on the obtained results the highest grain yield was belonged to Ardakan-Yazd in normal irrigation and spraying of nano-particles at concentration of 0.03 percent with an average of 194.05 grams per square meter, compared to non-sprayed treatment in which 17 percent lower grain yield was obtained. The highest grain yield also was observed at stress conditions in reproductive phase for ecotype of Maneh of North Khorasan at spraying of 0.015 percent of nano-particles with an average of 45.89 grams per square meter, when compared to the control (no spray) in which 16 percent lower grain yield was obtained. Ecotypes also showed significant differences at level of one percentage in terms of responses to drought stress. Based on the obtained results from spraying of nano-particles at a concentration of 0.03 percent, the negative effects of drought stress were reduced and this treatment prevented from huge yield loss under stress.
Azam Razavi Nasab; Hossein Shirani; Ahmad Taj abadi pour; Hossein Dashti
Volume 13, Issue 1 , August 2011, , Pages 31-42
Abstract
To study the effect of salinity and organic matter on chemical composition and root morphology of pistachio cv. Badami, budded on seedling root stocks, a greenhouse experiment was conducted as a factorial based on a completely randomized design with three replications. Treatments consisted of four salinity ...
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To study the effect of salinity and organic matter on chemical composition and root morphology of pistachio cv. Badami, budded on seedling root stocks, a greenhouse experiment was conducted as a factorial based on a completely randomized design with three replications. Treatments consisted of four salinity (zero, 800, 1600 and 2400 mg NaCl kg-1 soil) and three organic matter (zero, two and four percent w/w) levels as farmyard manure. As salinity levels increased, shoot nitrogen concentration decreased. Organic matter application increased shoot nitrogen concentration and interaction of salinity and organic matter on this parameter was not significant. Also, salinity had no significant effect on shoot potassium content, while with increasing salinity, root potassium concentration decreased. Application of organic matter increased shoot and root potassium concentration. Adding salinity and organic matter levels increased shoot and root cu concentration significantly. Similar trend was observed on Fe concentration. As salinity levels elevated, root length and density significantly reduced. In addition, adding organic matter improved physical and nutritional soil properties, and because of that significantly increased root length and density and decreased soil penetration.