Efficient Use of N and Water for Maize (Zea Mays L.) Crop under Drip Irrigation System using 15N Stable Isotope. Land Suitability Analyses for Cultivating Certain Crops in Some Wadies of Southwest Sinai, Egypt, Using Remote Sensing Data And GIS Technique. Efficiency of P and K Biofertilizers in Utilization of Soil and Rock P and K by Sorghum (Sorghum Bicolor) Grown on a Light Clay Torrifluvent Soil. Response of Sunflower (Helianthus annuus L.) to NApplication and Biofertilization with Assessment of Fertilizer N Recovery by 15N Versus Subtraction Methods. NPK Biofertilizers on Sorghum (Sorghum Bicolor) Grown on a Light Clay Torrifluvent Soil and Interactions Among Them. Mapping and Modeling Soil Characteristics to Evaluate Precision Farming. Land evaluation for some representative physiographic units in the eastern desert of Egypt using remote sensing data. Response of Wheat (Triticum astivum L.) to Bio fertilization and NPK fertilizers with and without Chicken manure. Soil Fertility and its Relationship to Soil Mineralogy of some areas in Southwest Sinai, Egypt. Soil Classification of Different Physiographic Units in South East Egypt Using Remote Sensing Data Bio and mineral-N fertilization of Sunflower (Helianthus annuus L.) Grown on Sandy Soil Using 15N Technique. Soil Salinity Assessing and Mapping Using Several Statistical and Distribution Techniques in Arid and Semi-Arid Ecosystems, Egypt. Soil Classification and Land Capability evaluation for sustainable Agricultural use in South Sinai, Egypt.