الفهرس 
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Abstract
Two field experiments were conducted during 2015/16 and 2016/17 seasons to study the effect of two sulfur levels (S) ; (0, 25 g/L), four levels of yeast (Y) concentration (0, 5, 10, 15 g/L) and irrigation deprivation (I) (Normal (I1), I2 and I3 irrigation) on growth, productivity and quality attributes of sugar beet, split split plot design in 3 replications was used in this study, the results showed that sulfur levels recorded a significant increase in growth, yields and quality characters. Normal and I2 irrigation gave the highest values in plant weight, LA, LAI. The highest significantly values of Na, α amino N and chlorophyll content were obtained from I2 irrigation, I3 irrigation gave the greatest values of root length, fresh root weight, LA characters. Yeast at rate (15 g/L) recorded the highest significantly values of growth characters, weight of plants, weight of roots and weight of top yields. Yeast at rate (5 g/L) recorded the highest significantly values of Na, α amino N. The effect of interactions as soon as S x I, S x Y, I x Y and S x I x Y recorded a significant differences in growth, yield and quality characters. It could be concluded that the combination of deprivation one irrigation and yeast concentration at rate (15 g/L) with application of sulfur under the condition of Egyptian north delta recorded the highest productivity of sugar beet and sugar %.