الفهرس 
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Abstract
SUMMARY AND CONCLUSIONS
Two field experiments were conducted at Sids Agricultural Research Station, Beni-Suef Governorate, during 2000/2001 and 2001/2002 growing seasons to study the effect of nitrogen (0,25,50 and 75kg/fed), phosphorus (0 and 45 kg P205 fed) and potassium (0 and 24 kg K20/fed) fertilization and their interactions on oilseed rape (Brassica napus L.). A factorial in complete randomized blocks design with four replicates was used. Pactol cultivars of rape was used in both seasons. Planting date was on November 23 and 21 in 2000/2001 and 2001/2002 seasons, respectively.
The obtained results were analyzed statistically. The obtained results could be summarized as follows:
A- Effect of nitrogen fertilizer levels: I- Growth characters
1-Plant height at 90 days after sowing and at harvesting significantly increased with increasing nitrogen level up to 75 kg/fed.
2-Number of leaves per plant at 90 days after sowing was increased with increasing nitrogen rates till 75 Kg/fed.
3-The increase in nitrogen application up to 75 kg/fed earliest the initiation of the number of days to appear the first flower in the first season only.
4-Flowering date measured as the number of days from sowing to 50% flowering did not affect by nitrogen fertilizer levels.
5-Number of branches per plant increased as level of nitrogen fertilizer increasing.
6-Dry weight at 90 days after sowing and at harvesting significantly increased as nitrogen level increase up to 75 Kg/fed.
H- Yield and yield components
1-Increasing nitrogen fertilizer rates increased number of pods per plant and number of seeds of pod. However, decreased 1000-seed weight in the first season.
2-Increasing nitrogen level up to 75 kg / fed significantly increased seed and straw yield of canola plant in kg/fed.
III- Seed quality
I- Seed oil percentage increased as a result of increasing nitrogen fertilization level in the second season, but no clear trends were obtained in the first one.
2- Nitrogen application tended to increase the oil yield in kg/fed by 47, 72. 5 and 89% under 25, 50 and75 kg N/fed, respectively as compared with control for the first season and 38.8, 100.8 and 144.5% for the second season, in the same order.
3-Seed protein percentage significantly increased due to incacasing nitrogen level in the first season only.
4-Increasing nitrogen level up to 75 kg/fed significantly increased protein yield in both seasons.
IV- NPK components
1-Nitrogen fertlizer increased nitrogen and potassium percentage in plant at 90 days after sowing in the two growing seasons, nitrogen percentage in seeds in the first season and phosphorus percentage in plant at 90 days after sowing and straw as well as potassium percentage in seeds in the second season. However, nitrogen parentage in plant at 90 days after sowing and in straw, phosphorus percentage in seeds and potassium percentage in straw did not affect by nitrogen fertilization level in both growing seasons.
2-Nitrogen, phosphorus and potassium uptake by seeds, straw and total uptake increased significantly as nitrogen levels increasing.
B- Effect of phosphorus levels. I- Growth characters
1-Plant height at 90 days after sowing and at harvesting increased by phosphorus application, while number of days to first flower and flowering date significantly decreased as phosphorus level increasing.
2-Number of leaves and branches per plant increased by phosphorus application in one season only , while dry weight at 90 days after sowing and after harvesting significantly increased by phosphorus application in the two seasons.