بررسی اثر تاریخ کاشت بر عملکرد دانه ژنوتیپ های جدید گندم در شرایط شمال خوزستان

To study the response of wheat genotypes to changes in planting date in north of Khuzestan conditions, an experiment was carried out using 13 wheat genotypes (‘Baj’, S-87-2, S-87-15, S-83-4, S-87-20, ‘Picaflor’, D-84-9, D-82-6, D-87-11, D-87-13, D-87-15, ‘Chamran’ and ‘Vee/nac’) at 4 planting dates (10th Dec., 25th Dec., 9th Jan. and 24th Jan). Each planting date was implemented as an independent experiment with three replications in a randomized complete block design. The results of combined analysis showed that planting date significantly affected the number of grains per spike, 1000-grain weight, grain yield and biological yield. Mean comparisons between the planting dates tested in this experiment showed that the highest (5872 kg/ha) and the lowest (4957 kg/ha) grain yields were obtained in the first (10th Dec.) and the forth (24th Jan) planting dates, respectively. Results of mean comparisons for grain yield between genotypes also showed that S-87-20 had the highest (5801 kg/ha) grain yield among the genotypes evaluated in this study. Delays in planting date led to a decline in biological yield. Grain yield of ‘Baj’ early mature line was higher than that of control cultivars (‘Chamran’ and ‘Vee/nac’) at the later planting dates (9th and 24th Jan.). Based on the results, 10th Dec. planting date and S-87-20 genotype are recommended for north of Khuzestan region.