الفهرس 
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Abstract
The present research was performed to study the effect of potassium fertilization levels and their addition times on growth, yield and yield components as well as quality of sugar beet (Beta vulgaris, L.) cv. Pelleno under salinity conditions. This study was performed during the two successive winter seasons of 1998/99 and 1999/2000 at ELHamoul Center, Kafr ELSheikh Governorate, in silty clay loam soil. The experiments were laidout in a split plot design with four replications. Each replicate included sixteen treatments comprising, four potassium fertilizer levels and four times of potassium application. The main plots were assigned to K levels viz. 12, 24, 36 and 48 kg K2O/fad. While the sub plots were occupied with four potassium addition times as follows: a. 2/3 before 1st irrigation and 1/3 before 2nd irrigation. b. 1/2 before 1st irrigation and 1/2 before 2nd irrigation. c. 1/3 before 1st irrigation and 2/3 before 2nd irrigation. d. 1/3 before 1st irrigation , 1/3 before 2nd irrigation and the last 1/3 was appiled before 3rd irrigation. ?The obtained data was concised to the following four items Growth attributes Yield components Yield quality Yield, (roots & top foliages ton/fad) IGROWTH ATTRIBUTES Root fresh weight (g/plant) The maximum of root fresh weights (582.94 and 646.25 g/plant) were recorded due to 48 kg K2O/fad while, the lowest weights (279.68 and 260.25 g/plant) were produced due to 12 kg K2O/fad) at 150 days of sowing in the first and second seasons, respectively. With respect to the effect of potassium addition times on root fresh weight, it was found that this trait was favoured when K was applied as 2/3 or 1/2 the amount before the first irrigation while the remaning prtions were added before the second irrigation , however the differences due to different application times were not evident in both seasons Also, the interaction between these two factors did not affect root fresh weight in any of the two seasons 1.2: Root dry weight (g/plant) The highest root dry weight (148.86 g/plant) was produced with 48 kg K2O/fad at 150 days from planting in the second season. While, the lowest root dry weight of 43.95 g/plant produced due to 12 kg K2O/fad. In addition, the difference in root dry weight due to 36 and 48 kg K2O/fad was not significant at 150 days from planting in the second season.