مقالات رزومه مهدی صادقی

In order to evaluate the effect of methanol foliar application on yield and physiological traits of cowpea under water  deficit the experiments were carried out in the research farm of Safiabad Agricultural and Natural Resources, Research and Education (Dezful) along two crop years 2016-17 and 2017-18. The experiment was performed as split split plots in a randomized complete block design with three replications. The studied treatments included water stress at four levels (25, 50, 75 and 100% water supply of the plant) as the main plot, three levels of methanol foliar application (control, 10 and 20% by volume) as a secondary factor and two bean genotypes (1057 line omidbakhsh and Mashhad) were as a sub-factor. The results showed that the application of different levels of water stress reduces the relative water content of leaves, the amount of chlorophylls and carotenoids and increases the amount of electrolyte leakage and proline content. On the other hand, foliar application of different levels of methanol were able to reduce greatly the destructive effects of water  deficit so that the relative water content of leaf increased from 69% in control to 73% in 20% volumetric methanol. Also, 1057 line showed better conditions than Mashhad cultivar for all measured physiological traits and was better in ability to tolerate water deficit. In addition, harvest index and biological yield were reduced under water deficit condition, but grain yield at 50% water supply of the plant showed the highest value due to the earlier entry of the plant in this stress to the flowering stage and longer this stage compared to 75% and 100% water supply of the plant. Also, methanol foliar application was able to eliminate the destructive effects of water deficit on the measured yield traits.

One of the important activities to achieve drought tolerant cultivars is screening and selection of cultivars, based on yield and biochemical characteristics. A split-plot experiment arranged in a randomized complete blocks design with three replications has been carried out in Safiabad Agricultural Research Center during two growing seasons (2017-19). The main plots are consisted of different irrigation regimes based on crop’s water requirement (25%, 50%, 75%, and 100%) and sub plots include five levels of alfalfa cultivars (Baghdadi, Nikshahri, Yazdi, Omid, and american Mesa-Sirsa). Results show that drought stress due to irrigation regimes have resulted in a significant reduction of forage dry matter yield and considerable changes of soluble sugar, glutation peroxidase, and catalase in alfalfa leaves. However, it has not greatly affected total protein. For forage dry matter yield, the highest statistical class belongs to Baghdadi cultivar under 100% water requirement supply treatment (2.824 t.ha-1). The lowest statistical class for forage dry matter yield has been observed in Yazdi and Mesa-Sirsa cultivars under 25% water requirement supply treatment (0.598 and 0.546 t.ha-1), respectively. Among the cultivars, examined in this experiment, Yazdi has been identified as a drought tolerant cultivar due to the stability of dry forage yield as well as high leaf antioxidants content.

In order to investigate the effect of plant density on yield and grain components of three canola cultivars in north of Khuzestan, an experiment was conducted in Agricultural Research Station of Agricultural Faculty of Islamic Azad University of Dezful Branch in Sanandz in 2012. This experiment was conducted as factorial in a randomized complete block design with three replications. Plant densities were considered at three levels (60, 80 and 100 plants per square meter) and canola cultivars (hayola 308, hayola 401 and S003). The results of analysis of variance showed that plant density and cultivar had a significant effect on grain yield, harvest index and oilseed rape oil yield, while 1000 seed weight, oil percentage and seed number per pod were not affected by density and cultivar treatments. Hayola 401 and Hayola 308 cultivars had the highest seed yield, and their grain yield increased with increasing plant density. The highest grain yield and canola oil yields were  at a density of 100 plants / m 2, with an average of 4470 and 2023.82 kg / ha, respectively. The highest grain yield was obtained at 100 and 80 plant / m2.