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Articles by S.M. El-Baz
Total Records ( 3 ) for S.M. El-Baz
  S.M. EL-Baz , El.El. Abbas and R.A.I. Abo Mostafa
  Two experiments were conducted at the experimental farm of Tag El-Ezz Research Station, Dakahlia Governorate, North Delta, Egypt, during 2010 and 2011 summer seasons. The field soil (new reclaimed soil) was clayey-loam in texture with medium salinity (EC = 2534 ppm). May 20th sowing date gave the highest values of all studied characters except for root rot and stalk rot disease severity which gives inverse this. The maximum seed yield (ton/fad) occurred under May 20th sowing date in Giza 83 cultivar in both seasons. Humic acid at 1000 ppm led to the highest values of yield and seed quality (protein and oil %). Moreover, the highest values of growth parameters occurred under the application of humic acid at 2000 ppm. May 20th sowing date interacted with Giza 83 cultivar was more effective in increasing Plant height, 100-seed weight, number of pods/plant, seed weight/plant and seed yield/fed The interaction between sowing date (May 20th) and humic acid (2000 ppm) gave the same effect. On the other side the maximum reduction in disease severity of damping-off, root and stalk rot diseases was recorded with Giza 83 in May 20th sowing date under application of humic acid at 1000 ppm. The present investigation recommend soaking seeds of Giza 83 cultivar in humic acid at 1000 ppm for 20 min then sowing it on May 20th and sprayed plants twice (after 50 and 65 days from sowing) with the same concentration to maximize the crop yield and minimize the disease severity of damping off and root and stalk- rots.
  K.M. Abd El-Hai , M.A. El-Metwally , S.M. El-Baz and A.M. Zeid
  Seed soaking method or foliar spray of antioxidants (citric acid and salicylic acid at 10 mM) and microelements (manganese and zinc at 2 g L-1) were tested to control of the damping-off and charcoal rot diseases of sunflower (varieties Sakha 53 and Giza 102). Field treatments in two different localities i.e., Tag El-Ezz, Dakahlia province and El-Serow, Damietta province were carried out. The high frequency isolated fungi (M. phaseolina and R. solani) presented in Tag El-Ezz location. On the other hand, M. phaseolina was isolated at a high frequency compared with R. solani in both locations. Sakha 53 was highly susceptible compered with Giza 102 when artificially infected with both M. phaseolina and R. solani. Laboratory results showed that salicylic acid alone or in combination with citric acid completely inhibited the linear growth of both pathogens i.e., M. phasoliana and R. solani in vitro. A positive correlation between the concentrations of Rizolex-T 50 and its effect on the fungal growth were recorded. The dose of 3 g L-1 prevented the growth of R. solani linear growth in vitro. The greenhouse results revealed that Giza 102 variety was highly susceptible to the infection by R. solani. M. phasoliana showed severe symptoms in both sunflower varieties. On contrary, Giza 102 variety was tolerant to damping-off and charcoal rot diseases than Sakha 53 under field conditions. The application of Rizolex-T 50 followed by citric acid showed a highest percentage of healthy plants followed by the combination of citric acid and salicylic acid. The application of manganese combined with zinc was more effective than the microelements alone. All treatments of antioxidants and microelements significantly reduced the incidence of charcoal rot disease. On the other hand, no significant differences between Rizolex-T 50 and salicylic acid treatments was shown. Sakha 53 variety gave the highest values of plant height and number of leaves plant-1 while Giza 102 recorded the highest values of stem diameter and flower head diameter. The application of citric acid combined with salicylic acid maximized the plant height followed by the mixture of manganese and zinc. Manganese treatment followed by the mixture of citric acid and salicylic acid then zinc were the most effective in increasing the number of leaves plant-1. While, Rizolex-T 50 had no significant effect on plant height and number of leaves plant-1. Microelements were more effective than antioxidants on enhancing the stem and flower head diameters. The combination between manganese and zinc followed by Rizolex-T 50 recorded the maximum values of the stem and flower head diameters. Giza 102 variety recorded the highest values of 100 seeds weight, total phenols, photosynthetic pigments and the percentage of seed oil when the above applications were carried out. Sakha 53 variety showed the highest plant yield under the above treatment. The mixtures of citric and salicylic acids were highly effective in increasing plant yield. The highest values of photosynthetic pigments were shown in salicylic acid treatment followed by Rizolex-T 50. Total phenols content was highest due to Rizolex-T 50 application followed by salicylic acid. Except zinc, seed oil concentration increased significantly in both antioxidants and microelements treatments on oil concentration.
  K.M. Abd El-Hai , M.A. El-Metwally and S.M. El-Baz
  The causal pathogens of root rot and stalk rot of soybean were isolated from infected plants. Fusarium oxysporum, F. solani, Macrophomina phaseolina and Rhizoctonia solani were the main causal pathogens of pre- and post-emergence damping-off. The isolated fungi especially R. solani caused anatomically deformation in the basal portion of infected stem including complete disruption in epidermal cells and degradation of primary cell wall in cortical cells. The growth substances; Ethrel, Indole Butyric acid (IBA) and Cycocel (CCC) were tested in vitro on the growth of the pathogenic fungi. Ethrel at 200 ppm was the most effective in reducing fungal growth. During two successive growing seasons (2008 and 2009) of soybean under different salinity stress (1000 to 3000 ppm), the application of growth substances led to significant reduction in pre- and post-emergence damping-off as well as root and stalk rot diseases. Ethrel, CCC and IBA increased significantly branches number plant-1, photosynthetic pigments, total phenol, proline content, yield and seed quality (oil and protein %). Ethrel and CCC at 200 ppm were the best treatments. Soaking soybean seed in Ethrel, CCC or IBA at 200 ppm is recommended to be incorporated into the production program of soybean to decrease root and stalk rots and increase productivity and seed quality under salt stress conditions.
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