Effect of Rate and Time of Potassium Fertilization on Growth and Physiological Character’s of Sugar Beet Plants

TWO FIELD experiments were carried out in 2002/2003 and 2003/2004 seasons at Sakha Agricultural Research Station. KafVelsheikh Governorate to study the effect of rate and time of potassium fertilization on growth, and physiological characters of sugar licet (Oscar poly variety). Potassium fertilization treatments included the combination between three rates 24. 48 and 72 kg K2O/fed and 7 application time each added as. full rate at sowing . 30 days and 60 days alter sowing or in two ecjual portions at sowing and 30 days . at sowing and 60 days . at 30 and 60 days and finally at 30 and 90 days after sowing. In addition to unfertilization treatment. Applying 72 kg K2O/fod in two equal portions the 1ts one at 30 days and the 2nd one at 60 or 90 days after sowing significantly increased length and fiesh weight of root, leaf area and dry weight / plant. Potassium fertilization treatments had also significant effect on crop growth rate, relative growth rate and net assimilation rate at different- growth periods (105-120. 120-135 and 135-150 days after sowing).While, root diameter and number of leaves were insignificantly affected by potassium fertilization