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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.