EFFECT OF SULFUR APPLIED AND FOLIAR SPRAY OF YEAST ON GROWTH AND YIELD OF SUGAR BEET UNDER IRRIGATION DEPRIVATION CONDITIONS

Two field experiments were conducted during 2015/2016 and 2016/2017 seasons to study the effect of sulfur levels (S) at (0, 25 g/L), yeast (Y) concentration (0, 5, 10, 15 g/L) and irrigation deprivation (D) (Normal, D. of 1 and 2 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 chemical characters. Normal and D. 1 irrigation gave the highest values in plant weight, dry leaves weight, LA, LAI, TSS. The highest significant values of Na, N and chlorophyll content were obtained from D. 1 irrigation, D. 2 irrigation gave the greatest values of root length, fresh and dry root weight, LA characters. Yeast at rate (15 g/L) recorded the highest significant values of growth characters, weight of plants, weight of roots and weight of top yields. Yeast extract at rate (5g/L) recorded the highest significant values of Na, N, T.S.S. The effect of interactions such as S x D, S x Y, D x Y and S x D x Y recorded significant differences in growth, yield and chemical 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 %.