الفهرس 
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Abstract
The present investigation was carried out at extension field, at El-Semblawin, Dakahlia Governorate during 2005 and 2006 seasons to study the performance of some soybean varieties, together under organic and inorganic mineral N fertilization treatments and their interaction on growth characteristics, yield and its components as well as oil and protein contents of soybean seeds (Glycine max (L) Merr.).
The experiments were carried out in a clay loam soil with medium fertility. The experiments were laid out in spilt plot design with four replications. Four soybean varieties (Giza 111, Crawford, Giza 35 and Giza 21) were occupied in the main plots. The Sub plot treatments were occupied by five treatments of organic and mineral N-fertilizations as follows:
1- The recommended nitrogen fertilizer rate (40 kg N/fed), it was added in the form of urea (46.0 %N).
2- Farmyard manure at the rate of 100% of the recommended N rate per fed (40kg N/fed).
3- Poultry manure at the rate of 100% of the recommended N rate per fed (40kg N/fed).
4- Farmyard manure at 75% of the recommended nitrogen (30 kg N/fed) + 25% N from urea (10 kg N/fed).
5- Poultry manure at 75% of the recommended nitrogen (30 kg N/fed) + 25% N from urea (10 kg N/fed).
Application of the combination of 75% of recommended N rate from poultry manure (30 kg N/fed) + 25% of recommended rate of N using urea as N source (10 kg N/fed) to soybean plantation using Giza 21 cultivar should be recommended to maximize seed and oil yield pre unit area and reducing soil and water pollution by using organic fertilization under Dakahlia Governorate conditions.