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Common vetch Vicia sativa L. response to gibberellic acid application (GA3), supplementary irrigation and its water stress critical stages

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Author(s): Caser Ghaafar Abdel 1* , Iqbal Murad Thahir Al-Rawi 2

Journal: International Journal of Biosciences
ISSN 2220-6655

Volume: 1;
Issue: 3;
Start page: 29;
Date: 2011;
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Keywords: 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.
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