alireza khodashenas
Abstract
In order to evaluate grain yield of wheat cultivars in two planting dates and determination of proper cultivars for autumn and entezari culture, a study is carried out during two years, between 2015 and 2017 in Torogh research station in Mashhad. Two planting dates of autumn and entezari culture are ...
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In order to evaluate grain yield of wheat cultivars in two planting dates and determination of proper cultivars for autumn and entezari culture, a study is carried out during two years, between 2015 and 2017 in Torogh research station in Mashhad. Two planting dates of autumn and entezari culture are the main plot and 16 genotypes of wheat (14 cultivars and 2 promising lines), including Baran, Rasad, Sardari, Sabalan, Crosssabalan, Rijav, Karim, Koohdasht, Dehdasht, Azar2, Homa, Ohadi, Ghaboos, and Aftab cultivars are the subplot. Results show that significant difference exist between cultivars in terms of agronomic characteristics and grain yield. Flowering date of cultivars differ and no cultivar start flowering in the optimum temperature range for flowering. Cultivars of Karim and Rijav with mean yield of 1430 and 1326 kg/ha, respectively, have had the maximum yield and cultivars of Ohadi and Rasad with mean yield of 893 and 925 kg/ha, respectively, the minimum. The difference between maximum and minimum grain yield is about 60%. Delay in planting leads to delay in pollination in all cultivars; therefore, autumn planting date could be recommended. Also for autumn planting, cultivars of Karim and Rijav can be advised and for entezari planting date only spring cultivars such as Karim and Aftab are recommended.
Vahid Reza Jalali; Mahdi Homaei
Volume 12, Issue 1 , May 2010, , Pages 29-40
Abstract
Canola response to root media salinity highly depends on its phenological stage. In most investigations, this fact is neglected. Therefore in most studies a single threshold value for each plant is introduced. The objective of this study was to investigate the quantitative response of canola to salinity. ...
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Canola response to root media salinity highly depends on its phenological stage. In most investigations, this fact is neglected. Therefore in most studies a single threshold value for each plant is introduced. The objective of this study was to investigate the quantitative response of canola to salinity. The study was done in two different experiments. In the first experiment, canola was exposed to salinity from the first growth stage. In second experiment, plants were irrigated with saline water only at final growth stage. Both experiments were conducted on a natural saline loamy sand soil, using salinity treatments including a non-saline water (tap water) and eight saline waters of levels (3, 5, 7, 11, 13, 15 and 17 dS.m-1). The Maas and Hoffman, van Genuchten and Hoffman, Dirksen et al., and Homaei et al., models were used to predict relative yield as a function of soil salinity. The obtained results based on the calculated maximum error (ME), root mean square error (RMSE), coefficient of determination (CD), modeling efficiency (EF) and coefficient of residual mass (CRM) statistics indicated the Homaee et al., model provides better prediction for both experiments.