Effect of sowing dates on some quantitative and qualitative traits of three landraces of black radish (Raphanus sativus var. niger)

In order to evaluate the effect of landrace and sowing date on some quantitative and qualitative traits of black radish, a factorial experiment based on a randomized complete block design with three replications was conducted in 2011. Treatments consisted of three black radish landraces (Shiraz, Mashhad and Yazd) and three sowing date (10, 20 and 30 September). Results showed that effect of landrace and sowing dates were significant for the most traits. The interaction effects of landraces and sowing dates were significant for leaf length, root diameter, root weight and yield. The results also indicate that Shiraz landrace was superior to the other landraces in terms of most of the measured traits. Yield decreased with delayed sowing and the highest yield was obtained from sowing in 10 September. According to results of the present study, it could be conclude that early September being the best time for sowing all of the three landraces in Marvdasht climate.