Spray of some plant extracts and its role in vegetative flowering and yield of three Okra (Abelmoschus esculentus L.) cultivars

Abstract

An experiment was carried out in the fields of Agriculture College, University of Kufa during two successive seasons 2015 and 2016. Treatments included three cultivars (Betra , Betera and Hessinawia), and seven spray treatments (licorice root extract at concentration 2.5 , 5 and 7.5 g.l-1 , and seaweed extract at concentration 1 , 2 and 3 ml.l-1 in addition to spray water to represent control treatment). Plants sprayed twice , first at 4 leaves stage and second spary was30 days later. Seeds sowed at 5th and 6th of April for both season respectively. Split-plot design was adopted according to Randomized Complete Block Design (RCBD) where cultivar represented by main plot and spraying treatments in sub-plot Means comparison were performed using Least Significant Differences (LSD) at 5% level of significant.Results showed that the superiority of Betra in plant height (80.85 and 81.99 cm) and number of fruits (19.43 and 23.16 fruit.plant-1), while Betera showed superiority in number of days to first flower formation on 50% of plants of experimental unit (59.87 and 56.96 days). Moreover highest fruit set (55.89 and 55.96%), average fruit weight (20.4 and 19.4 g), plant yield (331.9 and 405.9 g), and total yield (12.291 and 14.430 ton.ha-1). However Hessinawia plant had greater number of leaves (67.8 and 78.7 and leaf.plant-1), total leaf area (0.98 and 1.14 m2.plant-1). Spraying of licorice extract at concentration of 7.5 g.l-1 resulted in the highest values of all parameters including vegetative growth, flowering and yield, The total yield from this treatment was (12.854 ton.ha-1), Seaweed extract at a concentration of 3ml. L-1 on the other hand had less effect compared to licorice extract but still significantly different from the control in all tested parameters.