الفهرس 
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Abstract
A field experiment was carried out in a clay loam textured soil (Clayey, Smectitic, Superactive, Mesic, Typic) located at a private farm in Bilqas Distract, Dakahliya Governorate, Egypt (31o 13\ 37.87\\ N latitude and 31o 19\ 53.91\\ E longitude) to evaluate the effects of potassium rates, bio and foliar fertilization on growth, yield, quality and nutrient uptake of sugar beet (beta vulgaris L.) during 2014/2015 and 2015/2016 winter seasons. Split plot design with three replicates was performed. The Treatments Used were As Follows:The main plots were assigned by three levels of potassium fertilization of (0, 24 and 48 kg K2O fed-1) added as potassium sulfate (48% K2O). The sub plots were occupied by (four treatments) 1-Untreated control.
2- with bio-fertilizer (potassium solubilizing bacteria) Bacillus circulans. 3-Foliar fertilization of potassium humate (10% K2O) at the rate 1 L fed-1 per 400 liter water. 4- Foliar fertilization of boron (1.4%B) at the rate 1 L fed-1 per 400 liter water. The total of treatments were (3 levels of K x 4 bio fertilization levels and spray fertilization = 12 treatments). Each treatment was replicated 3 times to give a total of 36 experimental units. The plot unit space 2.5*3.5= 8.75 m2. (5 ridges (70cm)* 2.5 m long). One liter of both potassium humate and boron compounds (botaron) were applied at the rate (400 liter fed-1) as foliar spray in three sprays times (30, 60 and 90 days after seeding). Conclusions This investigation proved that the highest yield of (sugar, shoot and root) of sugar beet could be achieved with the addition of potassium sulphate at rate 48 kg K2O fed-1 with boron foliar fertilization at a rate of 1 liter of botaron compound (400 liter per feddan).The previous experimental treatment also recorded significant increases in the means of root length and height shoots, number of leaves, root radius, root quality, fresh and dry weight of shoots and roots, nutrient uptake in shoots and roots, concentration of nitrogen, phosphorus, potassium, boron and sugar, uptake of potassium and nitrogen and phosphorus by plant. Quality parameters also improved significantly. Potassium humate also has an important role in improving soil moisture and nutrient retention, reducing nutrient lock up in the soil, helps the development of better soil structures and stimulates plant root growth and soil biological activity.