Evaluation of response of wheat cultivars and lines to delay in planting date in Mashhad conditions

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.