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Articles by M.S. Gaballah
Total Records ( 5 ) for M.S. Gaballah
  M.A. El-Kholy and M.S. Gaballah
  A field experiment was executed on two wheat varieties (Sakha 93 and Giza 168) grown in clay loam soil under limited water condition at the agricultural experimental station of National Research Centre, Shalakan, Kalubia Governorate, for improving water stress tolerance of wheat plant, using a reflectant (MgCO3), during plant growth. Water shortage had a drastic effect on plant growth, yield and nutrient content, however reflectant treatment under limited water condition and different cultivation methods (ridges, drilling and hills) at milky and maturity stages showed great variations. It was proved that reflectant application increased plant yield to match with normal irrigation condition although growth parameters and nutrient contents did not show a clear significant improvement. Sakha 93 wheat variety surpassed Giza 168 in resisting water stress. The drilling cultivation method surpassed ridges and hills, also a clear increase in K+ content was observed in cultivation under water shortage condition and reflectant application.
  M.A. El-Kholy , S.A.H. Ouda , M.S. Gaballah and M. Hozayn
  A filed experiments was executed on two wheat varieties Sakha 93 and Giza 168 grown in clay loam soil under water stress condition at the agricultural experimental station of National Research Centre, Shalakan, Kalubia Governorate, for improving water stress tolerance of wheat plant, using a reflectant type of Anti-transpirant MgCO3, during plant growth. Water stress was imposed by withholding irrigation at milky and maturity stages. It has been proved that the weather parameters such as air temperature, soil temperature and relative humidity affected plant yield, also water shortage had a drastic effect on plant growth and yield. Prediction equations were developed and used to predict the performance of the Anti-transpirant use under water stress condition. It was evaluated that the amount of wheat yield reduction as a result of water stress was affected by genotype and stage of grain development. Sakha 93 was more tolerant to water stress than Giza 168. Soil temperature was a better predictor than air temperature in predicating straw yield but both were definitely good predictors for plant yield. Also reflectant application increased plant yield and seemed to be a promising method in combating drought stress. The percent reduction for Giza 168 grain yield was 24.25% before the application of MgCO3 under water stress condition. However after the reflectant application the percent reduction in grain yield became 9.98%, while in Sakha 93 it was 12.86% and became 7.12%, whereas losses in grain, straw and biological yields were reduced by 7.12, 4.99 and 5.95%, respectively. Air temperature negatively affected plant attributes except for number of spikes/m2 of water stressed plants, while soil temperature positively affected plant number of spike/m2, grain and straw yield. Also relative humidity showed a positive correlation with the wheat yield and its components.
  S.A. Ouda , M.S. Gaballah and M.A. El-Kholy
  This study was carried out to predict the role of two yield stabilizing agents (magnesium carbonate and sodium salicylate) on barley yield under water stress condition. Four hulled barley cultivars and two hull-less were sprayed with magnesium carbonate or sodium salicylate twice during vegetative growth and the last irrigation was skipped. Different growth and yield parameters were measured for five bordered plants. Data for mean temperature and relative humidity % were collected and averaged over the two growing seasons. Three groups of prediction equations were developed. The first group is an overall of the six barley cultivars prediction equations under the above mentioned treatments using plant attributes and weather parameters. The second group predicted barley yield over all the normal (hulled) cultivars only. The third group predicted barley yield over the two hull-less barley cultivars. Results indicated that the highest reduction in yields as result of skipping the last irrigation were obtained by Giza 126. Whereas, the lowest reduction in biological yields were obtained by the two hull-less cultivars. The application of magnesium carbonate had better effect on the yield of barley cultivars than the application of sodium salicylate. Results also showed that both temperature and relative humidity % were highly and negatively correlated with barley yields. The three yield attributes were positively correlated with barley grain, straw and biological yields, except for plant height, which was negatively correlated with grain yield. All the three developed groups of prediction equations had high degree of precision because R2 was high and SE% was low. Thus, it allowed us to predicted the expected yield under optimum conditions, under water stress and under the application of yield stabilizing agents, in addition to water stress. Furthermore, percent reduction in yield as a result of skipping the last irrigation and the improvement in yield as a result the application of yield stabilizing agents were estimated too.
  M.M. Hussein , M.S. Gaballah and S.Y. El-Faham
  Grains of barley (Hordeum vulgare L.) Cv. Giza 124 were treated by benzyl adenine and grown under different salinity levels (2000, 4000 and 6000 ppm of diluted seawater) where the concentration of different amino acids were determined. Phenyl alanine, serine, valine and glutamic acids increased in grains of plants subjected to 2000 ppm salts and tended to decrease with the higher salt levels. Proline, isoleucine and tyrosine concentrations increased by increasing salt concentration in the irrigation water up to 4000 ppm and then lowered in grains of plants treated with 6000 ppm salt solution. Threonine, serine, isoleucine, leucine, tyrosine and glutamic acids increased, however, proline and phenyl alanine concentration were progressively increased by spraying benzyl adenine at the rate of 50 ppm. On the other hand arginine, lysine, histidine and aspartic acids showed a significant decrease. Benzyl adenine application led to decrease in the concentration of all amino acids in grains irrigated by saline water 2000 ppm salts and significant increase at 6000 ppm compared to the control (tap water).
  M.S. Gaballah and M. Moursy
  A pot trial was executed on two wheat varieties (Sakha 69 and Giza 168) grown in clay soil under saline conditions at the greenhouse of National Research Centre, for improving salinity tolerance of wheat plant and reducing moisture loss through transpiration by spraying plants twice with two types of reflectants (magnesium carbonate and kaolinite), during plant growth. Salinity stress had a drastic effect on plant growth and yield, however reflectant treatments improved growth and yield characters under salinity stress. The use of reflectants also reduced water loss and limited the potential for evaporative leaf cooling. Reflectants lowered Na/K ratio compared to untreated plants. On the other hand the use of reflectants did not show any significant accumulation or decrease in proline content compared to untreated plants. Also, reflectant application has no effect on carbohydrate reserves.
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