Evaluation of the effect of planting date on yield and dry matter remobilization of wheat cultivarsMahboubeh Ranjbar ,, Mojtaba Alavi Fazel

In order to evaluate different planting dates in wheat cultivars on yield and remobilization of dry matter in the crop year 1396-97 in Ahvaz in the form of split plots in a randomized complete block design with three replications. the main factor included three planting dates of December 11, 31 December and January 20 and the sub-factor included four bread wheat cultivars Chamran-2, Sirvan, Mehregan and Chamran. the results showed that the effect of planting date and cultivar on current photosynthesis rate, current photosynthesis efficiency, remobilization rate and remobilization efficiency was significant at 1% level and the interaction effect of planting date and cultivar on grain yield and biological yield was significant at 1% level. the highest grain yield was obtained on planting date of December 11 and Chamran-2 cultivar (5420 kg/ha) while the lowest grain yield was obtained on planting date of 31 December and Sirvan cultivar (2660 kg/ha). the highest amount of remobilization was obtained from the date of planting on December 11 (153.45 g/m2) and the lowest rate was obtained from the date of planting on January 20 (100.25 g/m2). as a result, the planting date of December 11 was superior to other planting dates due to the provision of suitable temperature and radiation conditions in the vegetative and reproductive period and its favorable effect on yield and dry matter transfer of wheat in Chamran-2 cultivar.