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Abstract Soybean (Glycine max) is a subtropical legume. It is considered as protein and oil crop. The native country of soybean is East of Asia and considered one of the most important crops in China, (Liu et al., 2008). There is a great increasing in cultivation oil crops to fill up the requirements of oils. The United States, Brazil, China, Argentina and India represent the most producer countries (Mahna, 2005). As a legume, soybean can obtain its N from the soil, from N2-fixation, or both. Indeed, it is frequently reported that seed yields and total seed N are highest when N is obtained from both N fertilizer and N2-fixation (Harper, 1974; Zapata et al., 1987). In Egypt, the cultivated area of this crop was about 20076 feddan in 2005, produced about 25821 tons*. Soybean seed contains about 30 to 50% of protein and 20 to 25% of oil. Therefore, it’s useful as a lipoprotein food for human and farm animals. Moreover, soybean seeds are used in several food industries such as, soybean milk, soybean flour, biscuits and meat alternatives, as well as, the remains of crop are manufactured as a provender for animals. Soybean is a nitrogen-fixing plant. Therefore, it is planting in much area in the world. In Egypt, planting of soybean have started 30 years ago. Therefore, it is necessary to have information on different aspects of agronomic practices required for increasing the yield capacity of soybean varieties (Gracia and Caroloni, 1977; Morsy, 1980; Kogan, 1981; Yosry et al., 1984). Nitrogen (N) is the mineral nutrient that plants require it in greatest quantity and is the nutrient that most often limits plant * Arab Republic of Egypt, Ministry of Agricultural and Land Reclamation, Economic Affairs Sector, Central Administration for Agricultural Economic, the Indicators Agricultural Statistics. |