الفهرس 
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Abstract
5- SUMMARY AND CONCLUSION : Wheat (Triticum aestivum L.) is one of the most important strategic crops for Egypt and a few other developing countries. Wheat is used especially as human food. It is a major source of energy, protein and fiber in the human diet, for approximately 35% of the Earth’s population, and for this reason is the most important cereal crop globally. Wheat grain is one of the basic meals used for humans. The area of land planted with wheat in Egypt amounted to about 3.196 million feddans, and the full production exceeded 8.800 million tons, with an average of 18.36 ardebs/feddan (FAO, 2019). Wheat production is not always sufficient for regional consumption in Egypt. As a result, some attempts have been made to increase wheat production by increasing the cultivated area or maximizing yields to be able to meet the continuous demand and reduce the gap between production and consumption of wheat. Therefore, a field experiment was conducted on a farm in the Mansoura area - Dakahlia Governorate in Egypt during the winter seasons 2015/2016 and 2016/2017 to study the effect of biological, organic and mineral fertilizers on the growth and chemical composition of wheat plant (variety, Sids 12). The experiment was carried out in a split plot design with four replicates. where the main plots were assigned to organic and bio-fertilizers (control= B0O0, organic only= B0O1, Bio only= B1O0, bio+organic= B1O1). While the sub plots were assigned to five levels of mineral fertilization (0-25-50-75-100% of the recommended fertilizer dose (NPK) for wheat plant). Some characteristics of plants and soil were studied to determine the most important parameters and their impact on soil and plants. Studied characteristics. First Crop yield components. 1- The dry weight of the plant (kg.m-2) at 45 and 60 days stage and harvesting stage (kg.feddan-1). 2- The dry weight of straw (kg.feddan-1) at harvesting stage. 3- The dry weight of the grains (kg.feddan-1) at harvesting stage. Second: The proportions of some nutrients in the plant. 1- The uptake amount of nitrogen, phosphorous and potassium by grain and straw at harvesting stage of wheat plant (kg.fed-1). 2- The protein percentage in wheat grain at the harvest stage. Third: The content of the soil available form of some nutrients. 1- Available soil form of nitrogen, phosphorous and potassium mg.kg-1 soil and dehydrogenase enzyme in the three stages. The main results were summarized as follows. First: Crop yield components. • At the age of 45 days, it was found that the average dry weight of the organic + biological fertilization was (11.41 and 12.41) kg.m-2 in the two studied seasons, respectively, while the treatment of 100% mineral fertilization gave (11.32 and 12.32) kg.m-2 in both seasons, respectively. While when Studying the interaction between the treatments, it was found that the interaction between the organic and biological treatments without mineral fertilization (9.06 and 10.05) kg.m-2 was similar to the 100% mineral with the control (9.12, 10.12) kg.m-2 in both seasons, respectively. Also, it was found that the best treatment was the interaction between 100% + organic + bio-fertilization (13.09, 14.09) kg.m-2 in both seasons, respectively.