الفهرس 
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Abstract
Two Field experiment was conducted in two consecutive seasons 2015/2016 and 2016/2017 in the open field in Bramoon farm Hort. Res. Inst., Agric. Res .Center, Giza, Egypt to investigate the effect of foliar spraying with certain biomodulators (seaweed extract, SWE; humic acid, HA; peppermint oil, PO and thyme oil, TO) on broccoli and red radish plants. Field experiment (Broccoli plants): Biomodulators were foliarly-applied to broccoli after three times at 60, 70 and 80 days from planting, samples were taken to determined and stored at (5 oC and 95% relative humidity for two weeks . The main results were summarized as follows: Application of biomodulators led to increase in main and lateral flowering head, fresh weight compared with control and also the best values of dry weight, stem weight, leaves weight, plant height, stem height and leaf area. Red radish plants: Biomodulators were foliarly-applied to red radish after twice times at 20 and 30 days from planting, samples were taken to determined and stored at (5oC and 95% relative humidity for three months. The main results were summarized as follows: All treatments recorded improved results during both seasons. HA and T.O recorded the highest values of leaf area, fresh weight, dry weight for leaves and roots and leaves number compared with control. Pots experiment: Two pot experiments were carried out in the Experimental Farm, Faculty of Agriculture, Mansoura University, Egypt during the two seasons of 2017/18 and 2018/19. Broccoli have three irrigation intervals (5, 10 and 15 days), Red radish have two irrigation intervals (5 and 10 days). Storage was carried out, as was the case under field experiments to assess the effect of biomodulators (yeast extract (YE), moringa leaves extract (MLE), salicylic acid (SA) and humic acid (HA) to reducing the harmful of drought stress on studied plants. The main results were summarized in broccoli plants as follows: All biomodulators led to increase in morphological characters compared with control such as height, diameter of flowering heads, leaves number, fresh, dry weight and leaf area. While, irrigation intervals led to decrease in morphological characters except, irrigation every 10 days gave the best parameters compared with irrigation every 15 days. The main results were summarized in red radish plants as follows: Biomodulators caused increase growth parameters in the first season, SA recorded the best results with roots weight and Yt. In the second season. While, drought stress led to decrease in this parameter.