الفهرس 
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Abstract
Two field trials were carried out during 2013/2014 and 2014/2015 seasons in the farm of Sers El – Lian, Agriculture Research Station, (ARC), Menofyia Governorate, Egypt to study the effect of three sowing dates of wheat (T. aestivum L.) cv. Gemmeiza 11, with sugar beet (Beta vulgaris L.) cv. Mezzano - Au - poly Belgium, four intercropping patterns of wheat with sugar beet under three nitrogen fertilizer levels on growth, yield and its components as well as competitive relationships and yield advantages of two crops.
The soil type was clay loam with PH 7.80 and 7.48 in the first and second seasons, respectively. The preceding summer crop was maize in both seasons. A split-split plot design with three replications was used. Each experiment consists of 36 treatments which were the combination of three sowing dates of wheat with sugar beet were allocated to the main plots, four intercropping patterns were arranged in the sub – plots and three nitrogen fertilizer levels were assigned at random at the sub – sub plots, in addition two pure stand of sugar beet and wheat.
The treatments studied were:
D. Sowing dates of wheat with sugar beet:
D1. Sowing wheat and sugar beet at the same time.
D2. Sowing wheat on the 1st irrigation of sugar beet.
D3. Sowing wheat on the 2nd irrigation of sugar beet.
S. intercropping patterns:
S1. (100% sugar beet + 25% wheat of pure stand) sugar beet was planted on one side of the ridge (60 cm width), 20 cm apart between hills and thinned one plant/hill and wheat was sown on the other side of the second ridge of sugar beet in hills.
S2. (100% sugar beet + 25% wheat of pure stand) sugar beet was planted on both sides of the bed (120 cm width), 20 cm apart between hills and thinned one plant/hill and wheat was planted on the top of all beds in hills.
S3. (100% sugar beet + 33.3% wheat of pure stand) sugar beet was planted on one side of the ridge (60 cm width), 20 cm apart between hills and thinned one plant/hill and wheat was sown on the other side of the second ridge of sugar beet in hills.
S4. (100% sugar beet + 33.3% wheat of pure stand) sugar beet was planted on both sides of the bed (120 cm width), 20 cm apart between hills and thinned one plant/hill and wheat was planted on the top of all beds in hills.