الفهرس 
Physiological Studies On Sugar Beet Grown Under Drought Stress
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Abstract
Two field experiments on sugar beet (Beta vulgaris L.) were carried out in the agricultural research and experimental station, Faculty of Agriculture, Cairo University, Giza, Egypt during two successive seasons 2011 / 2012 and 2012 / 2013 to study the effect of basal potassium fertilization and foliar application of active dry yeast on vegetative growth, chemical composition and sugar beet yield as well as its attributes under drought stress. Two irrigation levels, i.e. control and low water level were investigated. Three doses of basal application of potassium sulphate 48% (50, 75 and 100 kg / fed) were applied after 30 days after planting. The foliar application of yeast (0, 10 or 14 g / l) was repeated two times at 45 and 60 days after planting. At harvest, sugar beet yield is determined and their attributes at 205 days. The results indicated that at both sample stages drought stress significantly reduced all root and leaves morphological growth characters, i.e. root length, root fresh and dry weights, root diameter, leaves fresh and dry weights, and number of leaves. Also, it significantly decreased the non - reducing sugar in roots and reducing sugars concentration in leaves at 130 days after planting. Meanwhile, at 180 days after planting, the insignificant differences of reducing, non - reducing and total sugar concentrations in roots and leaves between well - irrigated and drought stress plants might be attributed to the age factor