XI International Agriculture Symposium "AGROSYM 2020", Sarajevo, Bosnia And Herzegovina, 8 - 09 October 2020, pp.182
Climate change has direct and indirect effects to agriculture in all over the world. One of the negative effects is uneven and intensive precipitation. At last decades, wheat cultivation has faced to intensive rain amounts especially in sowing time in Turkey and this situation lead to retard wheat sowing. As considering this problem, there is need to find what is changed in wheat growth and development in order to tolerate negative effects of late sowing. For this purpose, the experiment was conducted in three different sowing time (ST1: 09.12.2019, ST2: 03.01.2020 and ST3: 17.01.2020) as three replications. The wheat plants were sampled in similar growth stages at each plot. RGR (Relative Growth Rate), NAR (Net Assimilation Rate) and CGR (Crop Growth Rate) were calculated by measuring dry weights and leaf areas from sampled wheats. Besides, wheat growth (by using Zadoks Scale) and phyllochron was measured in three days interval until last leaf was appeared in main stem. As results of study, the wheat of ST1 had higher RGR as 56.4 mg g-1 day-1 than ST3 (52.2 mg g-1 day-1) and ST2 (43.9 mg g-1 day-1). Similarly, NAR were found 4.16 mg cm-2 day-1, 0.99 mg cm-2 day-1 and 0.81 mg cm-2 day-1 at ST1, ST3 and ST2 respectively. However, ST3 had highest CGR value as 528 mg m-2 day-1 and following by ST2 (486 mg m-2 day-1) and ST1 (298 mg m-2 day-1). Vegetation time of wheat were shortened when sowing time is retarded. Furthermore, growth stage of late sowing wheats reached to growth stage of first sowing wheats almost after 6th leaf appeared. As conclusion, it was suggested that late sowing has negative effects to growing of wheat and need to study on morphological and physiological features of wheat.