الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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Abstract
Sugar beet is a special type of (Beta vulgaris, L) grown for sugar production and is considered the second important sugar crop in Egypt and in many countries all over the world after sugar cane (Sacchurum officinarum, L.). Increasing sugar production from unit area is considered one of the important national targets to minimize the gab between sugar consumption and production. Recently, sugar beet crop has an important position in Egyptian crop rotation as winter crop not only in the fertile soils, but also in poor, saline alkaline and calcareous soils. Whereas, it could be economically grown in the newly reclaimed soils such as at the Northern parts of Egypt as one of the most tolerant crops to salinity and wide range of climates.
Biofertilizers technologies are based on enhancing and improving the naturally existing nutrient transformation activities in the soil profiles, when the inoculant should be able to be adapted to the environmental conditions prevailing in the site of application. Whereas, inoculation seeds of various C3and C4plants with associative nitrogen-fixing bacteria led to improve plant growth and yield Abo-Elgoud (2000).
Sugar beet is considered to be tolerant to defoliation since foliage losses up to 75% can be compensated and yield is not significantly affected .The selection of a suitable cultivar can also restrict root quality degradation (Tsialtas et al 2010). It is assumed that the mechanism responsible for this compensation is that the newly expanded leaves after defoliation photosynthesize more and respire less than the older, intact leaves French and Humphries (2008).
Abscisic acid (ABA) plays a regulatory role in many physiological processes in plants. Different stress conditions such as water, drought, cold, light, and temperature result in increased amounts of ABA. The action of ABA involves modification of gene expression and analysis of responsive promoters revealed several potential cis- and trans-acting regulatory elements.
The main objective of this work is to reduce the quantities of mineral nitrogen fertilizer used compensated both vital biofertilizers such as (Rhizobacterine) to reduce pollution incident from the use of chemicals and increasing productivity of the sugar beet crop. As well as providing part of the green fodder fresh and processed for animal feed in winter and summer and provide appropriate feed.
The main objective of use abscisic acid (ABA) is to stop the activity roots after harvest and during storage until transported to manufacturi