EFFECT OF CYCOCEL AND FOLIAR NUTRITION OF NITROGEN AND BORON ON GROWTH OF SOYBEAN CULTIVARS

A field study was conducted during Summer seasons of 2012 and 2013 in Al-Namea Region-Falluja city of Al-Anbar province to studay the effect of cycocel and foliar nutrition of nitrogen and boron in growth of soybean cultivars. A split-split plot arrangement in randomized complete block design RCBD with three replicates. The cultivars (Sinaea 2, Giza 35 and Giza 22) placed in the main plots. While foliar nutrition with nitrogen and boron (0B+0N, 10B+250N and 20B+500N) mg.l(-1) placed in sub plots. The sup-sup plots were included three concentrations of cycocel (0, 50 and 100) mg.l(-1). The cultivar Giza 22 gave the highest rate of the number of branches. plant(-1) (4.89 and 5.64) branches. plant(-1) and leaf area (44.20 and 51.04) dm(2) respectively, and leaf area index. The concentration (20B+500N) mg.l(-1) gave the highest rate of the number of branches. plant(-1), leaf area (44.26 and 49.15) dm(2), leaf area index and number of days from planting to maturity and also gave the lowest number of days from planting to 50% flowering, while the concentration (10B+250N) mg.l(-1) gave the highest rate of plant height (101.89 and 122.70) cm respectively. The concentration 100 mg.l(-1) from cycocel record the lowest rate of the plant height (93.59 and 107.86) cm, leaf area (38.89 and 43.14) dm(2) and leaf area index while gave the highest rate of the number of branches. plant(-1) (5.85, 4.90) respectively. A significant interaction between cultivars and foliar nutrition, the cultivar Giza 22 with (10B+250N) mg.l(-1) gave the highest rate of the leaf area. The interaction between cultivar Giza 22 with concentration 100 mg.l(-1) from cycocel gave the lowest rate of plant height (92.69 and 106.22) cm and number of days from planting to 50% flowering. It also gave the highest rate of the number of branches. plant(-1). The triple interaction between cultivar Giza 22 with concentration (20B+500N) mg.l(-1) of foliar nutrition and concentration 100 mg.l(-1) from cycocel (V3F3C3) was significant effect in number of branches. plant(-1). While the combination V1F1C3 gave the lowest rate of leaf area and leaf area index. But the combination (V2F1C3) gave the lowest rate of plant height.