Seyed Farhad Saberali
Abstract
The aim of this study was to investigate the interaction between planting date and the nitrogen application rate on the growth and yield of winter wheat in Torbat-e-Jam, Khorasan Razavi province. The field experiment was conducted in a randomized block design with split plot arrangements and three ...
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The aim of this study was to investigate the interaction between planting date and the nitrogen application rate on the growth and yield of winter wheat in Torbat-e-Jam, Khorasan Razavi province. The field experiment was conducted in a randomized block design with split plot arrangements and three replications in Torbat-e-Jam, in the 2019-2020. Experimental treatments included three planting dates: 1 October, 17 October and 2 November as the main plot, and nitrogen fertilizer at levels 0 (as a control), 100, 125, 150, 175 and 200 kg nitrogen ha-1 as a subplot. Pishtaz cultivar was planted in experimental plots which included 7 planting lines with a row spacing of 15 cm and a length of 8 m. The results of the analysis of variance showed that planting date and nitrogen fertilizer application and their interaction had a significant effect on all measured traits. The results showed that the yield and yield components were the highest on 1 October, and the values of most of these traits showed a significant decrease in planting on 12 November compared to 10 October. The highest grain yield was obtained from a nitrogen application rate of 200 kg ha-1 on 1 October and 16 October, while the maximum yield was obtained with an application rate of 175 kg ha-1 on 2 November. The growth and yield response of wheat to the rate of nitrogen application decreased with a delay in planting date, and the option of planting date must be considered in order to recommend efficient fertilizer usage.
jaber khordadi Varamin; Farzad Fanoodi; jafar masoud sinaki; Shahram rezvan; Ali Damavandi
Abstract
To investigate the physiological responses of sesame cultivars to the application of nano magnesium and chitosan biopolymer under different irrigation regimes, a split factorial based on randomized complete block design has been conducted with three replicates between 2017 and 2018. The irrigation cut-off, ...
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To investigate the physiological responses of sesame cultivars to the application of nano magnesium and chitosan biopolymer under different irrigation regimes, a split factorial based on randomized complete block design has been conducted with three replicates between 2017 and 2018. The irrigation cut-off, based on BBCH scale, has served as the main factor (normal irrigation, irrigation up to 50% flowering, and seed ripening), with the sub factors including Oltan and Dashtestan-2 sesame cultivars, and nano magnesium (application and non-application) and chitosan (control, 4.8, and 6.4 g.L-1). The highest mean grain yield belongs to the application of 6.4 g.L-1 chitosan under normal irrigation with an average of 1235.1 kg.ha-1. Also, the highest total chlorophyll content is observed in Dashtestan-2 genotype under normal irrigation with a mean of 24.7 mg.g-1 FW and the lowest mean have been obtained in both genotypes under irrigation up to 65 BBCH with a mean of 17.21 and 17.46 mg.g-1 FW, respectively. Application of nano fertilizer in Oltan genotype under irrigation up to 65 BBCH increases the catalase activity by 41.11%, compared to the control treatment. The highest activity of ascorbate peroxidase has been achieved when not applying chitosan under irrigation conditions up to 65 BBCH. It has risen by 55.06%, compared to the control treatment. In general, the results show that irrigation up to 65 BBCH reduces grain yield, in turn alleviated by the negative effects of stress on magnesium and chitosan nanoparticles (9.93% and 27.46%, respectively). Based on the regression analysis results, four traits, namely chlorophyll b, total chlorophyll, proline, and catalase, enter the model that explains 42.11% of the total grain yield variations. Results of simple correlation between traits and regression analysis indicate the indirect effects of physiological traits on grain yield and among the studied parameters, photosynthetic pigments has been of high account in stress conditions.
Nahid Fathi; Hemmatollah Pirdashti; Morteza Nasiri; Esmaeil Bakhshandeh
Abstract
This study aimed to investigate the effect of different local climates on grain yield (GY) and yield components (YC) of two different rice cultivars (cvs. ‘Tarom Hashemi’ and ‘Shiroudi’) and also to quantify the relationships between GY and YC with the average of weather temperature ...
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This study aimed to investigate the effect of different local climates on grain yield (GY) and yield components (YC) of two different rice cultivars (cvs. ‘Tarom Hashemi’ and ‘Shiroudi’) and also to quantify the relationships between GY and YC with the average of weather temperature (T, °C) and solar radiation (SR, MJ m-2 d-1) during the growing season of rice. Three field experiments were conducted separately based on the randomized complete blocks design with four replications, at the paddy fields of Babolsar, Amol and Polesefid cities in northern Iran in 2014. The results indicated that the effect of different local climates were statistically significant on GY, the number of panicles, length of panicle, weight of panicle, total number of grain in each panicle and the number of filled grain (P < 0.01). In all traits, the values related to Polesefid were lower than both Amol and Babolsar which can be resulted in lower T and SR during the rice growing, especially in the reproductive stage. Decline in T and SR due to increasing in the above mean sea level were cased a decrease in GY and biological yield of both cultivars (about 10-25 percent, depending on the cultivar). In addition, GY was affected by decrease in T more than SR. Consequently, the results shown that we simply can quantify the variation in GY in both cultivars under different local climates and also can calculate a possible reduction in GY due to the delay in transplanting.