Red Bean (Vigna angularis) Pioneering Trials in a Cool Mediterranean Area.
Sui Yau, American University of Beirut, American Univeristy of Beirut - FAFS, 3 Dag Hammarskjold Plaza 8th Floor, New York, NY 10017-2303
Red bean, also known as Azuki bean, is a valued pulse in East Asia. In Lebanon, red bean may have the potential to replace illicit crops. The objectives of this study were to identify a suitable red bean line and the optimal intra-row spacing and sowing time for red bean in the Bekaa Valley, which has a cool Mediterranean climate and is the dominant agriculture area of Lebanon. Split-plot experiments were conducted in 2003 and 2005 at the Agricultural Research and Educational Center (33°56’ N, 36°05’ E, 995 m a.s.l.). The site has a frost-free period from mid-April to mid-November. In 2003, irrigation was the main plot, and intra-row spacing was the subplot. In 2005, there were 5 sowing dates and 6 red bean lines. There was no significant irrigation by intra-row spacing interaction on seed yield and seed weight. Irrigation increased seed yield (P<0.10), but not seed weight. An intra-row spacing of 20cm gave the highest seed yield, and the 10cm spacing led to the highest seed weight. In 2005, sowing date-by-line interaction was significant for seed yield but not for seed weight. Four lines gave the highest yield in the May 26 sowing, but the highest yield was obtained in the May 6 and May 26 sowings for 1 line and in the May 6 and June 16 sowings for another line. On average, May 26 sowing gave the optimal yield (1190 kg/ha). Seed size increased with each delay in sowing and reached the highest (12.0 g/100 seed) in the last sowing on June 30. There were significant differences in seed yield and size between lines. Line 8, which had large seed and gave the 2nd highest yield, appeared to be the best among the lines tested.