Caser Ghaafar Abdel, Iqbal Murad Thahir Al-Rawi
Horticulture, Dohuk University, Iraq
Field Crops, Salahalddin University, Kurdistan, Iraq
Key words: Common vetch, rainfalls, supplementary irrigation, gibberellic acid.
Abstract
Physiological responses to gibberellic acid, irrigation and water stress were investigated in common vetch. It was observed that supplementary irrigation (75 % of soil available capacity) resulted in significant reductions in plant height (20.5%), plant length (15.3%), number of node on main stem (11%), leaflet/leaf (8.5%), weight of 1000 seeds (28%), biomass (65.9%) and seed yield (43.6%), as compared to 25% level of watering. Regression analysis manifested that Vetch yield linearly responded to irrigation levels. Vetch plants treated with 200mg/L GA3 resulted in significant increases in biomass (37.2%), pod number per plant (43%) and seed yield (32%), as compared to untreated. Moreover, 100 mg/l GA3 highly exceeded in node number on main stem (8.2%), biomass (7.1%) and seed yield (11.6%). Regression analysis revealed that vetch yield was linearly related to irrigation levels.
Vetch plant treated with 200 mg/l GA3 grown under 25% level gave the highest plant height (49.33 cm), first fruiting node (12.33), biomass yield (672.67 g.m-2),and seed yield (142.33 g.m-2). However the lowest values were confined to untreated with 75% level watering in seed yield (79.33g.m-2). It was also found that withholding complementary watering during the pod swelling and seed fillings resulted in profound reductions in weight of 1000 seeds (5.2%), biomass yield.m-2 (26.8 g) and seed yield per m-2 (23%). However, first fruiting node (33.3%) and pod number per plant (25.7%) were significantly increased, as compared to continuous watering.
Original articles Source: Volume 1, Number 3, June 2011- IJB
Published By: International Journal of Biosciences (IJB)
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