بررسي اثرات تاريخ كاشت و تلقيح بذر بابا كتري بر عملكرد و اجزاء عملكرد دو رقم سويا

Effects of sowing date and rhizobium inoculation on yield and its components in soybean

In order to investigate the effects of sowing date and Rhizobium inoculation (RI) on yield and its components two cultivars of soybean, a field experiment was conducted in 2002 at Agricultural Research Station of Gharakhil (Ghaernshahr) using a split-plot factorial arrangement in randomized complete block design. Experimental treatments were sowing date (8 and 18 May and 28 May and 7 June), cultivar (Williams and Line 20) and inoculation (RI and no RI). Statistical analysis showed that sowing dates were different with respect to pod number per plant, seed number per plant, seed weight and grain yield, but not for seed number per pod. Cultivars were significantly different with respect to all the measured trails. RI significantly increased all measured traits, except for seed number per pod. RI was more effective in sowing dates of 18th and 28th of Ordibehesht, probably due to more opportunity for bacterial activation and nitrogen fixation.